Replacing the Thermostat and/or Engine Coolant Temperature Sensor

Thermostat / temperature sensor, engine coolant, replacing

Preparation
Remove the cap from the expansion tank.
Install a hose clamp on the upper coolant hose.
Raise the car. Remove the lower splashguard.
Position a container under the engine drain cock. Drain 2 liters of engine coolant.
Close the cock. Install the lower splash guard. Lower the car.
Disconnect the sensor cable connector.
Remove the upper timing belt cover.

Removing the thermostat

Remove
- the thermostat housing cover
- the thermostat.

Removing the engine coolant temperature (ECT) sensor
Remove the thermostat housing cover.
Clean the thermostat housing mating surfaces. Ensure that there is no dirt left in the thermostat housing.
Remove the sensor.

Installing the thermostat

Install
- the new thermostat
- Install the thermostat housing cover. Use a new gasket . Tighten to 17 Nm .

Installing the engine coolant temperature (ECT) sensor

Install
- the new sensor. Use a new gasket . Tighten to 20 Nm
- the thermostat housing. Use a new gasket . Tighten to 17 Nm .
Connect the sensor cable connector.

Finishing
Install the upper camshaft cover. Remove the hose clamp.
Fill with coolant.
Install the cap on the expansion tank.

Function test
Test drive the engine until the thermostat has opened.
Top up the coolant if necessary.