Aer Conditionat,Incalzire Si Ventilatie

7/30/2019 Aer Conditionat,Incalzire Si Ventilatie

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Chapter 3Cooling, heating and ventilation systems

ontentsconditioning compressor (auxiliary) drivebelt -ecking and renewal See Chapter 1onditioning system - general information and precautions . . . . 11onditioning system components - removal and refit ting 12

onditioning system refrigerant check See Chapter 1eeze mixture See Chapter 1ant level check See Chapter 1ant pump - removal and ref itting 7ng system - draining See Chapter 1ng system - fil ling See Chapter 1ng system - flushing See Chapter 1

egrees of difficulty

Cooling system electrical switches and sensors - testing,

removal and refitting Cooling system hoses - disconnection and renewal Electric cooling fan(s) - testing, removal and refitting

General information and precautions Heating and ventilation system - general information Heater/ventilation components - removal and refitting Heater vents - removal and refitting

Radiator - removal, inspection and refitting Thermostat - removal, testing and refitting

sy, suitable for

vice with little

perience

Fairly easy, suitable

for beginner with

some experience

Fairly difficult, suitable

for competent DIY

mechanic

Difficult, suitable for

experienced DIY

mechanic

Very difficult,

suitable for expert D

or professional

pecificationseral

mum system pressure 1.4 bars

rmostat

ning temperatures:rts to open 89C

ly-open 101C

ctric cooling fan(s)

ng fan(s) cut in:gle-speed cool ing fan:998 cc 8-valve models 95C

All other models 97Cin-speed cooling fan(s):*

Slow speed 97CFast speed 101Cng fan(s) cut out:gle-speed cooling fan:

998 cc 8-valve models 86Cll other models 92Cn-speed cooling fan(s):*low speed -. 92Cast speed 96C

n-speed cooling fans are fitted to all models with air conditioning, and to models supplied to countries with a hot climate.

que wrenc h sett ings Nm ibf ft

ant pump bolts:24 cc and 1360 cc models:ower bolt 7 5pper bolt 16 120 cc and larger-engined models 15 11perature switches/sensors:ewed into radiator 35 26ewed into cylinder head/coolant outlet housing 18 13


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2 Cooling, heating and ventilation systems

eneral information

The cooling system is of pressurised type,mprising a coolant pump driven by theing belt, an aluminium crossflow radiatorh integral expansion tank, electric cooling

(s), a thermostat, heater matrix, and allsociated hoses and switches.

The system functions as follows. Coldolant in the bottom of the radiator passesough the bottom hose to the coolant pump,ere it is pumped around the cylinder blockd head passages, and through the oiloler(s) (where fitted). After cooling theinder bores, combustion surfaces andve seats, the coolant reaches thederside of the thermostat, which is initiallysed. The coolant passes through theater, and is returned via the cylinder blockthe coolant pump.

When the engine is cold, the coolantculates only through the cylinder block,inder head, and heater. When the coolant

aches a predetermined temperature, thermostat opens, and the coolant passesough the top hose to the radiator. As theolant circulates through the radiator, it isoled by the inrush of air when the car is inward motion. The airflow is supplementedthe action of the electric cooling fan(s)

en necessary. Upon reaching the bottom ofradiator, the coolant has now cooled, andcycle is repeated.

When the engine is at normal operating

mperature, the coolant expands, and someit is displaced into the expansion tank.olant collects in the tank, and is returned toradiator when the system cools.

On models with automatic transmission, aoportion of the coolant is recirculated from bottom of the radiator through thensmission fluid cooler mounted on thensmission. On 16-valve models, theolant is also passed through the engine oiloler.

The electric cooling fan(s) mounted in frontthe radiator are controlled by a

ermostatic switch. At a predetermined

olant temperature, the switch/sensortuates the fan.

recautions

Warning: Do not attempt toremove the expansion tank fillercap, or to disturb any part of thecooling system, while the engine

hot, as there is a high risk of scalding. Ife expansion tank filler cap must bemoved before the engine and radiatorve fully cooled (even though this is notcommended), the pressure in the coolingstem must first be relieved. Cover the

p with a thick layer of cloth, to avoidalding, and slowly unscrew the filler cap

until a hissing sound is heard. When thehissing has stopped, indicating that thepressure has reduced, slowly unscrew thefiller cap until it can be removed; if morehissing sounds are heard, wait until theyhave stopped before unscrewing the capcompletely. At all times, keep well awayfrom the filler cap opening, and protectyour hands.

Warning: Do not allow antifreeze

to come into contact with yourskin, or with the painted surfacesof the vehicle. Rinse off spills

immediately, with plenty of water. Neverleave antifreeze lying around in an opencontainer, or in a puddle in the driveway oron the garage floor. Children and pets areattracted by its sweet smell, but antifreezecan be fatal if ingested.

Warning: If the engine is hot, theelectric cooling fan may startrotating even if the engine is notrunning. Be careful to keep your

hands, hair, and any loose clothing well

clear when working in the enginecompartment.

Warning: Refer to Section 11 forprecautions to be observed when

working on models equippedwith air conditioning.

2 Cooling system hoses -

disconnection and renewal

Note: Refer to the warnings given in Section 1of this Chapter before proceeding. Hosesshould only be disconnected once the engine

has cooled sufficiently to avoid scalding.1 If the checks described in Chapter 1 reveala faulty hose, it must be renewed as follows.

2 First drain the cooling system (see Chap-ter 1). If the coolant is not due for renewal, itmay be re-used, providing it is collected in aclean container.

3 To disconnect a hose, proceed as follows,according to the type of hose connection.

Conventional hose connections -general instructions

4 On conventional connections, the clipsused to secure the hoses in position may be

either standard worm-drive clips ordisposable crimped types. The crimped typeof clip is not designed to be re-used andshould be replaced with a worm drive type onreassembly.

5 To disconnect a hose, use a screwdriver toslacken or release the clips, then move themalong the hose, clear of the relevantinlet/outlet. Carefully work the hose free (seeillustration). The hoses can be removed withrelative ease when new - on an older car, theymay have stuck.

6 If a hose proves to be difficult to remove, tryto release it by rotating its ends beforeattempting to free it. Gently prise the end ofthe hose with a blunt instrument (such as a

flat-bladed screwdriver), but do not much force, and take care not to dapipe stubs or hoses. Note in particuradiator inlet stub is fragile; do excessive force when attempting tothe hose.

If all else fails, cut the with a sharp knife, theso that it can be peele

two pieces. Although tprove expensive if the hose isotherwise undamaged, It is prefto buying a new radiator. Checkhowever, that a new hose is reaavailable.

7 When fitting a hose, first slide the the hose, then work the hose into pcrimped-type clips were originally fstandard worm-drive clips when rehose. If the hose is stiff, use a litwater as a lubricant, or soften the

soaking it in hot water. Do not ugrease, which may attack the rubbe

8 Work the hose into position, checkis correctly routed, then slide each along the hose until it passes over end of the relevant inlet/outlettightening the clip securely.

9 Refill the cooling system with refChapter 1.

10 Check thoroughly for leaks aspossible after disturbing any pacooling system.

Radiator bottom hose

Removal

11 Turn the locking ring ("2") anti-until it contacts the stop ("illustration).

12 Press the connector away from to ensure that the two retaining lugs(see illustration).

13 Pull the hose, complete connector, from the radiator.

2.5 Disconnecting the radiator t

General information and

precautions


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Cooling, heating and ventilation system

1 To release the radiator bottom hosennection, turn the locking ring (2) until it

contacts the stop (1)

Recover the O-ring from the connector,

discard it; a new one must be used on

ting.

fitting

Wipe the connector and the stub on theator thoroughly with a clean, lint-free

h.

Fit a new O-ring to the male half of the

nector, ensuring that it is correctly seated

e illustration).

Turn the locking ring clockwise until it

ks.

Offer the hose to the stub on the radiator,

the locating cut-out in the male part of

connector located at the bottom (see

stration).

Push the connector into the stub until

h the retaining lugs click into position.ke sure that the O-ring is not trapped.

Pull the connector rearwards (away from

stub) to adjust the position of the retaining

if necessary.

Refill the cooling system with reference to

pter 1.

Check thoroughly for leaks as soon as

sible after disturbing any part of the

ing system.

2.12 Press the connector away from thehose, to ensure that the two retaining

lugs (3) are free

Radiator bypass hose connection

Removal

23 The hose is secured by means of abayonet-fit connector.

24 Turn the connector on the end of the hoseanti-clockwise as far as it will go (seeillustration).

25 Rock the connector back and forth torelease it from the radiator outlet. Remove theO-ring, and discard it; a new must be used onrefitting.

Refitting

26 Wipe the connector and the stub on theradiator thoroughly with a clean, lint-freecloth.

27 Fit a new O-ring to the male half of theconnector.

28 Offer the connector to the outlet on theradiator, and twist anti-clockwise to engage

2.16 On refitting, fit a new O-r(arrowed) to the hose union

2.18 Offer the hose to the radiatorthe cut-out (arrowed) at the bot

the guide rails on the connector with on the radiator (see illustration).29 Push the connector fully hocompress the O-ring.30 Turn the connector clockwise as fastop.

31 Refill the cooling system with refeChapter 1.

32 Check thoroughly for leaks as spossible after disturbing any part cooling system.

Heater matrix hose connecti

Removal33 The two hoses are connectedmatrix by means of a single connector34 Prise the metal retaining clip fromof the connector (see illustration).

4 To release the radiator bypass hose,n the connector on the end of the hose

anti-clockwise

2.28 On refitting, engage the guide rails (1)with the lugs on the radiator, then twist the

hose end in a clockwise direction

2.34 Remove the metal clip from ththe heater matrix connector on the

compartment bulkhead . . .


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35 . . . then release the plastic retaining 2.36 . . . and pull the connector away from 3.3 Removing the cover panel froclip . . . the bulkhead - recover the O-rings (arrowed) radiator

Release the plastic retaining clip byshing it towards the left-hand hosennection (see illustration).

Pull the connector assembly from theater matrix. Recover the O-ring seals from

e connector, and discard them; new onesould be used on refitting (see illustration).

efittingRefitting is a reversal of the removal

ocedure, using new O-rings.

Refill the cooling system with reference toapter 1.

Check thoroughly for leaks as soon asssible after disturbing any part of theoling system.

Radiator -

removal, inspection and refitting

te: New sealing rings must be used when

connecting the radiator lower hoses - seection 2. If leakage is the reason for

moving the radiator, bear in mind that minorks can often be cured using a radiatoralant with the radiator in situ.

emoval

Disconnect the battery negative lead.

Drain the cooling system as described inapter 1.Undo the three retaining screws, andmove the plastic cover panel from above thediator (see illustration).

4 Disconnect the wiring plug from the coolingfan switch (where fitted) on the left-hand sideof the radiator (see illustration).5 Disconnect the radiator upper hose(s) (left-hand side), and the lower hoses (right-handside), with reference to Section 2.6 Depress the two retaining clips, located at

the top ends of the radiator, then carefully liftthe radiator from the vehicle. Note the locatinglugs at the bottom of the radiator, whichlocate in the mounting rubbers in the lowerbody panel (see illustrations).

Inspection

7 If the radiator has been removed due tosuspected blockage, reverse-flush it asdescribed in Chapter 1. Clean dirt and debrisfrom the radiator fins, using an air line (inwhich case, wear eye protection) or a softbrush. Be careful, as the fins are sharp, andeasily damaged.

8 If necessary, a radiator specialist canperform a "flow test" on the radiator, toestablish whether an internal blockage exists.

9 A leaking radiator must be referred to aspecialist for permanent repair. Do notattempt to weld or solder a leaking radiator,as damage to the plastic components mayresult.

10 In an emergency, minor leaks from theradiator can be cured by using a suitableradiator sealant, in accordance with itsmanufacturer's instructions, with the radiatorin situ.

11 If the radiator is to be sent for rrenewed, remove all hoses, and thefan switch (where fitted).

12 Inspect the condition of the mounting rubbers, and renew tnecessary.

Refitting13 Refitting is a reversal of removal,

in mind the following points:

(a) Ensure that the lower lugs on the

are correctly engaged with the mo

rubbers in the body panel.

(b) Reconnect the hoses with referenc

Section 2, using new O-rings whe

applicable.

(c) On completion, refill the cooling sy

as described in Chapter 1.

Removal

1 Disconnect the battery negative lea

2 Drain the cooling system as descChapter 1.

3 Where necessary, release any wiring and hoses from the retaining clposition clear of the thermostat houimprove access. On 1905 cc models,is also improved if the air cleaner removed (see Chapter 4).

4 Disconnecting the cooling fan switch

wiring plug

3.6a Depress the retaining clips . . . 3.6b . . . and withdraw the radia

4 Thermostat -

removal, testing and refitting


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a Thermostat housing cover retainingbolts (arrowed) - 1360 cc models

nscrew the retaining bolts, and carefullydraw the thermostat housing cover tose the thermostat. Take care not to straincoolant hoses connected to the coverillustrations).

ft the thermostat from the housing, andver the sealing ring(s) (see illustration).

stingrough test of the thermostat may be

e by suspending it with a piece of string inntainer full of water. Heat the water to

g it to the boil - the thermostat must openhe time the water boils. If not, renew it.

a thermometer is available, the precisening temperature of the thermostat maydetermined; compare with the figuresn in the Specifications. The openingperature is also marked on the thermostat.

thermostat which fails to close as ther cools must also be renewed.

fittingefitting is a reversal of removal, bearing ind the following points:Examine the sealing ringfs) for signs ofdamage or deterioration, and if necessary,enew.

Ensure that the thermostat is fitted thecorrect way round, with the spring(s)acing into the housing.On completion, refill the cooling systemas described in Chapter 1.

4.4b Thermostat housing cover retainingbolts (arrowed) -1905 cc models

5 Electric cooling fan(s) -

testing, removal and refitting

Testing

1 Current supply to the cooling fan(s) is viathe ignition switch (see Chapter 5) and a fuse(see Chapter 12). The circuit is completed bythe cooling fan thermostatic switch, which (onmost models) is mounted in the left-hand sideof the radiator. On models with airconditioning, the cooling fans are controlledby the "Bitron" sensor - see Section 6.

2 If a fan does not appear to work, run theengine until normal operating temperature isreached, then allow it to idle. The fan shouldcut in within a few minutes (before thetemperature gauge needle enters the redsection, or before the coolant temperaturewarning light comes on). If not, switch off theignition and disconnect the wiring plug from

the cooling fan switch. Bridge the twocontacts in the wiring plug using a length ofspare wire, and switch on the ignition. If thefan now operates, the switch is probablyfaulty, and should be renewed.

3 If the fan still fails to operate, check thatbattery voltage is available at the feed wire tothe switch; if not, then there is a fault in thefeed wire (possibly due to a fault in the fanmotor, or a blown fuse). If there is no problemwith the feed, check that there is continuitybetween the switch earth terminal and a good

4.5 Removing the sealing ring fromthermostat flange

earth point on the body; if not, then th

connection is faulty, and must be re-m

4 If the switch and the wiring are condition, the fault must lie in the motThe motor can be checked by disconnfrom the wiring loom, and conne12-volt supply directly to it.

Removal5 Remove the radiator as descrSection 3.

6 Disconnect the wiring plug from thethe motor (see illustration).7 On models with a plastic radiator(both single- and twin-fan arrangeunscrew the three motor retainingrotating the fan blades as necessary the bolts can be counterheld from the the nuts are unscrewed. Withdraw thassembly, complete with the fan, ffront of the vehicle (see illustration).

8 On models with a single cooling fathe motor is secured to the body by frame, undo the retaining bolts, then the motor and mounting frame frvehicle.

9 If desired, the fan blades can be rfrom the motor shaft, after its retaininor clip (as applicable) has been remov

10 If the motor is faulty, the complmust be renewed, as no spares are av

Refitting

11 Refitting is a reversal of removal. radiator as described in Section 3.

6 Cooling system electrical

switches and sensors -

testing, removal and refitting

Disconnecting the wiring plug from a

cooling fan

5.7 Withdrawing a cooling fan motor

assembly - twin-fan arrangement

Electric cooling fan thermosswitch - models without airconditioning

Testing

1 Testing of the switch is descr

Section 5, as part of the electric coo

test procedure.


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6.2 Electric cooling fan thermostatic

witch - models without air conditioning

6.12 Coolant temperature

uge/temperature warning light sender(arrowed) -1360 cc models

moval

he switch is located in the left-hand sidehe radiator (see illustration). The engineradiator should be cold before removing

switch.isconnect the battery negative lead.artially drain the cooling system to justw the level of the switch (as described inpter 1). Alternatively, have ready aable bung to plug the switch aperture inradiator when the switch is removed. Ifmethod is used, take great care not toage the radiator, and do not use anything

ch will allow foreign matter to enter theator.

isconnect the wiring plug from the switch.arefully unscrew the switch from theator, and recover the sealing ring (where

icable). If the system has not beenned, plug the switch aperture to prevent

her coolant loss.

itting

the switch was originally fitted usinging compound, clean the switch threadsoughly, and coat them with fresh sealingpound.

the switch was originally fitted using aing ring, use a new sealing ring onting.efitting is a reversal of removal. Tightenswitch to the specified torque, and refill (or

up) the cooling system as described inpter 1.

10 On completion, start the engine and run ituntil it reaches normal operating temperature.Continue to run the engine, and check that thecooling fan cuts in and out correctly.

Electric cooling fan thermostaticswitch - models with airconditioning

11 The cooling fans are controlled by the"Bitron" sensor. This is located in the

thermostat housing, which is bolted onto theleft-hand end of the cylinder head - seeparagraphs 20 to 22.

Coolant temperaturegauge/temperature warning lightsender

Testing

Note: On models with air conditioning, thesender provides a signal to the gauge only.The coolant temperature warning light isoperated by the "Bitron" temperature sensordescribed later in this Section.12 The coolant temperature gauge/warning

light sender is screwed into the thermostathousing, which is bolted onto the left-handend of the cylinder head. The sender can beidentified by its blue wiring connector (seeillustration).

13 The temperature gauge (where fitted) isfed with a stabilised voltage from theinstrument panel feed (via the ignition switchand a fuse). The gauge earth is controlled bythe sender. The sender contains a thermistor -an electronic component whose electricalresistance decreases at a predetermined rateas its temperature rises. When the coolant iscold, the sender resistance is high, current

flow through the gauge is reduced, and thegauge needle points towards the blue (cold)end of the scale. As the coolant temperaturerises and the sender resistance falls, currentflow increases, and the gauge needle movestowards the upper end of the scale. If thesender is faulty, it must be renewed.

14 On models with a temperature warninglight, the light is fed with a voltage from theinstrument panel. The light earth is controlledby the sender. The sender is effectively aswitch, which operates at a predeterminedtemperature to earth the light and completethe circuit. If the light is fitted in addition to a

gauge, the senders for the gauge and light areincorporated in a single unit, with two wires,one each for the light and gauge earths. Onmodels with air conditioning, the light isoperated via the "Bitron" sensor - seeparagraphs 20 to 22.

15 If the gauge develops a fault, first checkthe other instruments; if they do not work atall, check the instrument panel electrical feed.If the readings are erratic, there may be a faultin the voltage stabiliser, which will necessitaterenewal of the stabiliser (the stabiliser isintegral with the instrument panel printedcircuit board - see Chapter 12). If the fault lies

in the temperature gauge alone, check it asfollows.

16 If the gauge needle remains at tend of the scale when the enginedisconnect the sender wiring plug, athe relevant wire to the cylinder heaneedle then deflects when the igswitched on, the sender unit is proveand should be renewed. If the nedoes not move, remove the instrume(Chapter 12) and check the continuwire between the sender unit and th

and the feed to the gauge unit. If conshown, and the fault still exists, gauge is faulty, and the gauge unit srenewed.

17 If the gauge needle remains at end of the scale when the engine disconnect the sender wire. If the nereturns to the "cold" end of the scathe ignition is switched on, the sendeproved faulty, and should be reneweneedle still does not move, chremainder of the circuit as dpreviously.

18 The same basic principles apply t

the warning light. The light should ilwhen the relevant sender wire is earth

Removal and refitting

19 The procedure is similar to that dpreviously in this Section for the cooling fan thermostatic switch. Omodels, access to the switch is very pother components may need to be before the sender unit can be reached

"Bitron" temperature sensormodels with air conditioning

Testing

20 The sensor forms part of conditioning "Bitron" control systeSection 11). Testing of the sensor shentrusted to a Citroen dealer.

Removal and refitting

21 The "Bitron" temperature sescrewed into the thermostat housing, bolted onto the left-hand end of the head. The sensor can be identifiedbrown wiring connector.

22 The procedure is similar to that depreviously in this Section for the cooling fan thermostatic switch. O

models, access to the switch is very pother components may need to be rbefore the sender unit can be reached

Coolant temperature sensorinjection models

Testing

23 The fuel injection system temperature sensor is screwed inthermostat housing, which is bolted oleft-hand end of the cylinder head. Thecan be identified by its green connector.

24 The sensor is a thermistor (se

graph 13). The fuel injectionmanagement ECU supplies the senso


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3a On 1580 cc and larger-enginedmodels, unscrew the retaining bolts

(arrowed).. .

voltage and then, by measuring theent flowing in the sensor circuit, itrmines the engine's temperature. Thismation is then used, in conjunction withr inputs, to control the injector opening(pulse width). On some models, the idled and/or ignition timing settings are alsoerature-dependent.

f the sensor circuit should fail to provideuate information, the ECU'S back-up facilityverride the sensor signal. In this event, theassumes a predetermined setting which

llow the fuel injection/engine managementem to run, albeit at reduced efficiency.n this occurs, the warning light on thement panel will come on, and the advice ofroen dealer should be sought. The sensorcan only be tested using special Citroenostic equipment. Do notattempt to test thet using any other equipment, as there is arisk of damaging the ECU.

oval and refitting

he procedure is similar to that describedously in this Section for the electricng fan thermostatic switch. On someels, access to the switch is very poor, andin components may need to be removede the sensor can be reached.

movalain the cooling system as described inter 1.move the timing belt as described inter 2.

acken and remove the retaining bolts,withdraw the pump from the cylinder

k (see illustrations). Recover the pumpg (1124 cc and 1360 cc models) oret (1580 cc and larger-engined models).w O-ring or gasket should be used onng.

itting

sure that the mating surfaces of the

7.3b . . . and remove the coolant pump

pump and the cylinder block are clean anddry.5 On 1124 cc and 1360 cc models, fit a newO-ring to the rear of the pump. Refit the pumpto the engine, and tighten its retaining bolts tothe specified torque.

6 On 1580 cc and larger-engined models,position a new gasket on the rear of thepump. Offer the pump to the engine, ensuringthat the gasket remains correctly positioned.Install the pump retaining bolts, and tightenthem to the specified torque.

7 Refit the timing belt as described in Chap-ter 2.8 Refill the cooling system as described inChapter 1.

1 The heating/ventilation system consists of afour-speed blower motor (housed behind thefacia), face level vents in the centre and ateach end of the facia, and air ducts to thefront footwells.

2 The control unit is located in the facia, andthe controls operate flap valves to deflect andmix the air flowing through the various parts ofthe heating/ventilation system. The flap valves

are contained in the air distribution hwhich acts as a central distributiopassing air to the various ducts and ve3 Cold air enters the system through tat the rear of the engine compartmrequired, the airflow is boosted by the and then flows through the variousaccording to the settings of the controair is expelled through ducts at the reavehicle. If warm air is required, the copassed over the heater matrix, w

heated by the engine coolant.4 On models fitted with air conditiorecirculation switch enables the outsupply to be closed off, while the air invehicle is recirculated. This can be uprevent unpleasant odours enterinoutside the vehicle, but should only bbriefly, as the recirculated air insvehicle will soon become stale.

9 Heater/ventilation componen

- removal and refitting

Heater/ventilation control un

Removal

1 Disconnect the battery negative lea2 Remove the centre console as descChapter 11. On lower-specification where no centre console is fitted, uretaining screws and remove the heacover (where fitted) from the centrefacia assembly.

3 Where a radio/cassette player iremove it as described in Chapter 1

undo the two retaining screws and remmounting bracket from the radio apertillustrations). Where no radio/cassettis fitted, carefully prise out the storafrom the centre of the facia panel.

4 Undo the four centre vent panel rscrews (two located above the controls, and two directly below), thethe panel and withdraw it from thDisconnect the wiring connectors fcigarette lighter and ashtray illuminati

9.3a Undo the two retaining screws(arrowed).. .

9.3b . . . and remove the mounting from the radio aperture

Coolant pump -emoval and refitting

8 Heating and ventilation system -

general information


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9.4a Undo the four centre vent panelretaining screws (ar row ed) ...

remove the centre vent panel assemblym the vehicle (see illustrations).Undo the two heater control panel retainingews, then release the lower panel retaining

and manoeuvre the panel out from thetre of the facia (see illustration).

9.9 Control cable connection (1) andretaining clip (2) at heater assembly

9.4b . . . and withdraw the panel from the

facia

6 Disconnect the control cables and thewiring connector(s) from the rear of the heatercontrol panel, noting their locations, andwithdraw the panel from the vehicle.

Refitting

7 Refitting is reversal of removal, bearing inmind the following points:(a) Ensure that the control cables are

correctly reconnected to the controlpanel, as noted before removal.

(b) Refit the radio/cassette player withreference to Chapter 12.

Heater/ventilation control cablesRemoval

8 Remove the complete heater assembly asdescribed later in this Section.9 The cables can now be disconnected fromthe heater assembly and the heater controlpanel (see illustration). Note the locations ofthe cables before disconnecting them.

9.5 Undo the heater panel retascrews, and release the clip (arr

Refitting

10 Refitting is a reversal of removal.

Heater matrixRemoval

11 Remove the facia assembly as din Chapter 11.12 Remove the retaining screws, andthe wiring retaining brackets from ththe heater unit, noting their locatioillustration).

13 Working inside the vehicle, disconwiring plug from the right-hand sidheater unit (see illustration).

14 Remove the heater assemblretaining bolt (see illustration).15 Working in the engine compremove the two heater unit retaining nthe bulkhead (below the heater matconnector), and recover the washeillustration).

16 Drain the cooling system as desc

2 Heater unit wiring bracket retaining 9.13 Disconnect the wiring plug from the 9.14 Heater assembly lower retaini

screws (arrowed) right-hand side of the heater (arrowed)

5 Heater unit retaining nut on engine 9.17a Remove the two retaining screws(arrowed)...compartment bulkhead

9.17b . . . and withdraw the retaininfrom the bulkhead


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9.18 Withdrawing the heater unit

pter 1. Disconnect the heater hosenector from the heater matrix, withence to Section 2.

Remove the two retaining screws, anddraw the retaining plate from the heaterx hose connector (see illustrations).

Working inside the vehicle, withdraw theer unit, complete with the control panel

illustration). Be careful not to spillant inside the car.

Remove the retaining screws, wherecable, then release the clips and

draw the heater matrix from the heatermbly (see illustration).

tting

Refitting is a reversal of the removaledure, bearing in mind the followings:

If a new matrix is to be fitted, unbolt theose connector elbow from the old

matrix, and fit it to the new matrix using

ew O-rings(see illustrations).Reconnect the heater hoses to the matrixwith reference to Section 2.Refit the facia assembly as described inChapter 11.Refill the cooling system as described inChapter 1.

ter blower motor

moval

Working inside the vehicle, remove thefelt undercover and the driver's side

9.19 Withdrawing the heater matrix fromthe heater assembly

lower facia panel (left-hand-drive models) orthe glovebox (right-hand-drive models), asapplicable, with reference to Chapter 11.22 Unscrew the three blower motor retainingscrews, and lower the assembly from the facia(see illustration).

23 Pull off the cover and disconnect the twowiring plugs, then withdraw the assembly

from the vehicle (see illustration).Refitting


Heater blower motor resistor

Removal

25 Disconnect the battery negative lead.

26 Remove the wiper arm as described inChapter 12.

9.20b . . . and remove the hose connectorelbow from the old heater matrix

9.20a Undo the retaining bolts

27 Open the bonnet, and remove wiper motor cover/vent panel rscrews. Carefully ease the cover obehind the windscreen sealingDisengage its front locating pegmanoeuvre the panel away from the ve

28 Remove the plastic cover from theblower motor intake duct.

29 Twist the resistor anti-clockwrelease it from the bracket, then disthe wiring plug and withdraw the uillustrations). Tie a piece of stringwiring connector, to prevent it falling bof the duct.

Refitting

30 Refitting is a reversal of removal, the wiper arm with reference to Chapt

9.20c Fit the elbow to the new musing new O-rings

2 Unscrewing a heater blower motorretaining screw

9.23 Pull off the cover (arrowed) anddisconnect the wiring plugs

9.29a To remove the heater bloweresistor...


10/10


9b . . . twist the unit anti-clockwise anddisconnect the wiring plug

mplete heater assembly

moval

Removal of the complete heater assemblyescribed in paragraphs 11 to 18, as part of

heater matrix removal and refittingcedure.

ittingRefitting is a reversal of removal, withrence to paragraph 20.

10.1 Withdrawing a facia side vent

Facia centre vents

Removal

3 Remove the centre vent panel from the faciaas described in Section 9, paragraphs 1 to 4.4 Working at the rear of the centre vent panel,remove the retaining screws, then withdrawthe vent assembly from the panel.Refitting


cia side vents

moval

Carefully release the relevant vent from thea, using a screwdriver (with a piece of carder the blade to avoid damage to the facia

), then withdraw the vent (seestration).

itting

imply push the nozzle into its housing infacia, ensuring that it is correctly engaged

the heater duct, until the retaining lugsk into place.

11 Air conditioning system -

general information andprecautions

General information1 An air conditioning system is available oncertain models (see illustration). It enablesthe temperature of incoming air to be lowered,and also dehumidifies the air, which makes forrapid demisting and increased comfort.

2 The cooling side of the system works in thesame way as a domestic refrigerator.Refrigerant gas is drawn into a belt-drivencompressor, and passes into a condensermounted on the front of the radiator, where itloses heat and becomes liquid. The liquidpasses through an expansion valve to an

11.1 Schematic diagram of airconditioning system

1 Compressor2 Condenser3 Drier bottle4 Pressostat

5 Control valve6 Evaporator7 Heater/ventilation

booster motor

evaporator, where it changes frounder high pressure to gas unpressure. This change is accompandrop in temperature, which coevaporator. The refrigerant returnscompressor, and the cycle begins ag

3 Air blown through the evaporator pthe air distribution unit, where it through the heater matrix to achdesired temperature in the pa

compartment.4 The heating side of the system wosame way as on models withconditioning (see Section 8).

5 The operation of the system is celectronically by the "Bitron" contwhich controls the electric cooling facompressor, and the facia-mounted light. Any problems with the system sreferred to a Citroen dealer.

Precautions6 When an air conditioning system isis necessary to observe special pre

whenever dealing with any part of theor its associated components. If reason the system must be disconentrust this task to your Citroen dearefrigeration engineer.

Warning: The refrigerationcontains a liquid refrigera(Freon), and it is therefore

dangerous to disconnect aof the system without specialisedknowledge and equipment.7 The refrigerant is potentially danand should only be handled by qpersons. If it is splashed onto the ski

cause frostbite. It is not itself poisonin the presence of a naked flame (inccigarette) it forms a poisonouUncontrolled discharging of the refrigdangerous, and potentially damaginenvironment.

8 Do not operate the air conditioningif it is known to be short of refrigerantmay damage the compressor.

Warning: Do not attempt tthe refrigerant circuit. Refthe precautions given inSection 11.

1 The only operation which can be caeasily without discharging the refrigrenewal of the compressor drivebelt.described in Chapter 1, Section 2"Bitron" temperature sensor may be rusing the information in Section 6.) Aoperations must be referred to a dealer or an air conditioning specialist

2 If necessary, the compressor cunbolted and moved aside,

disconnecting its flexible hoses

0 Heater vents -removal and refitting

12 Air conditioning systemcomponents -

removal and refitting

Aer Conditionat,Incalzire Si Ventilatie

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