3308479 - 1088C water pump and thermostat (Automatic transmission)

WATER PUMP

It is the centrifugal vane type, with an aluminium alloy pump casing and phenolic resin impeller.Mounted on the cylinder block/crankcase, it is operated by the crankshaft via a Poly-V belt.

THERMOSTAT

Fitted on the gearbox side cylinder head, it has the task of keeping the engine at the optimum temperature:

  • at a temperature of < 87 ± 2° C the (closed) thermostatic valve directs the coolant towards the pump
  • at a temperature of > 87 ± 2° C the (open) thermostatic valve directs the coolant towards the radiator.
Mounted on the thermostat, there is the coolant temperature sensor connected to the fuel injection control unit (  See subassembly 1056   PETROL INJECTION SYSTEM ).