3*2 Cooling, heating and ventilation systems
12 If tho pump is stuck, tap It gently using a soft-faced mallet • do not lever between the pump and cylinder block mating faces.
Inspection 13 Check the pump body and impeller for signs of excessive corrosion. Turn the impeller, and check for stiffness due to corrosion, or roughness due to excessive end play. 14 Check the clearance between the pump Impeller and the casing using a feeler blade (see Illustration). If the clearance is different to that given In the Specifications, the pump must be renewed. No spare components are available; the pump can only be renewed as a complete assembly. 15 On diesel engine models, remove the O-rlng at the end ol the transfer pipe, which runs behind Ihe cylinder block and fits Into the rear of the coolant pump. A new O-rlng should be fitted as a matter of course.
Refitting
Petrol engine models 16 Commence refitting by thoroughly cleaning all traces of sealant from the mating faces of the pump and cylinder block/pump housing. 17 Apply a continuous bead of sealant {liquid gasket) to the cylinder block mating face of the pump, taking care not to apply excessive sealant, which may enter the pump itself (see Illustration). 18 Place the pump In position In Its housing, then refit and lighten the bolts/nuts to the specified torque. 19 Refit the liming belt as described In Chapter 2A or 28. 20 Refit the auxiliary drivebeltfs) and refill the cooling system as described in Chapter
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A. 21 Reconnect Ihe battery negative terminal. Diesel engine models 22 Commence refitting by thoroughly cleaning all traces of old gasket from the mating faces of the pump housing and cylinder block. 23 Place a new gasket in position on (he cylinder block, locate the pump in position, then refit and tighten the bolts (see
7.17 On petrol engine models, apply a continuous bead of sealant (liquid gasket) to the pump mating face
pump Impeller and the casing using a feeler blode (diesel engine) illustration). Ensure that the end of the coolant transfer pipe seats firmly In tho port at the rear of the coolant pump, without displacing the O-ring seal. 24 Refit Ihe pump pulley, then refit the securing bolts and tighten to the specified torque. Counterhofd the pulley using the same method employed during removal. 25 Where applicable, refit the power steering pump with reference to Chapter 10. 26 Refit and tension the auxiliary drivebelt(s) as described in Chapter 18. 27 Refill (he cooling system as desenbed in Chapter 1B. 28 Reconnect the battery negative terminal.
8 Heater/ventilation components - § removal and refitting
Complete heater assembly
A
Warning: On mode's fitted with air conditioning, do not attempt to remove the cooling unit, which Is located between the heater blower motor casing and the main heater assembly. Romovat of the cooling unit entails disconnection of refrigerant lines - refer to Section 10 for precautions to be observed.
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tf In any doubt as to the procedure fo follow on models with air conditioning, consult a Fiat dealer for advice. Note: This is an involved procedure, and It (s recommended fhat the following Section fs read thoroughly before commencing work. Plenty of time should be allowed to compter the operation. During dismantling, make notes on the routing of all wiring and cables, and the locations of all fixings, to aid reassembly. Removal 1 Disconnect the battery negative terminal (refer to Disconnecting the battery In the Reference Section of this manual), 2 Set the heater control to HOT. then drain the cooling system as described In Chapter 1A or 18. 3 Working in the engine bay, slacken the clips and dotach the healer unit coolant hoses from the ports at the bulkhead (see illustration) Recover the rubber grommets. 4 Refer to Chapter 11 and remove the entire facia assembly from the vehicle bulkhead. Rest the assembly on the front seats. 5 At this stage, access to the air l nlet/dlstrl but Ion/blending control cables is possible. These can be easily disconnected from their respective control levers and renewed If required. 6 Working from the engine bay. remove the protective plastic caps to expose the heater assembty mounting studs and remove the nuts 7 Label the electrical connections to 1hi» heater assembly, to aid correct refitting later and then unplug them at the connectors 8 Slacken and remove the nuts and lift the healer assembly off its mounting studs. Refitting 9 To refit the assembly, reverse the steps described for removal, bearing in mind the following points: a) Make sure that all wiring and cables are muted as noted during dismantling. b) Make sure that dl air ducts are securely reconnected. c) Refit the facia components with reference to Chapter 11. dl On completion, refill the cooling system as described In Chapter 1A or 18.
8.3 Slacken the clips (arrowed) and detach the heater unit coolant hoses from the ports at the bulkhead
