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Home >> Volvo >> 2000 >> S40 L4-1.9L Turbo VIN 25 B4204T2 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Component Access/Replace Procedures
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Component Access/Replace Procedures



Checking / Replacing the Thermostat

Draining coolant






Drain off approximately 2 liters of coolant.

Removing the Thermostat

Turbocharged engines: remove the throttle body (TB) cover.
Remove the cover over the fuel rail.
Remove the upper timing cover.
Remove the thermostat housing cover (Torx 40 screws). Lift out the thermostat and the gasket.



Checking the Thermostat






The function of the thermostat can be tested using hot water.
When the water temperature corresponds to the opening temperature of the thermostat, the thermostat should open fully within two minutes.

Marking: 90
Starts to open at: 90°C
Fully open at: 105°C

Installing the Thermostat






Clean the mating surfaces on the thermostat housing.
Install a new gasket on the thermostat.
Install the thermostat in the housing. Install the cover.
Tighten the cover. Tighten to 17 Nm.
Install the upper timing cover.
Install the cover over the fuel rail.

Turbocharged engines: install the throttle body cover.

Fill with coolant
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