Replacing the Thermostat and/or Engine Coolant Temperature Sensor

Replacing the thermostat and/or engine coolant temperature sensor

Special tools:
951 2885 Sleeve 951 2885 Sleeve

Replacing the engine coolant temperature (ECT) sensor

Removing the engine coolant temperature (ECT) sensor

Remove:
- the upper timing belt cover
- cable from the sensor
- the sensor from the thermostat housing. Use socket951 2885 Sleeve 951 2885 Sleeve.

Note! Put paper underneath the sensor to prevent coolant spillage.

Installing the engine coolant temperature (ECT) sensor

Install:
- the sensor with a new seal
- Tighten to 22 Nm, use socket951 2885 Sleeve 951 2885 Sleeve
- the upper camshaft cover.

Replacing the thermostat

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 upper timing belt cover
- the auxiliaries belt.
Remove the delivery pipe from the power steering pump.

Note! Put paper under the generator (GEN) to avoid oil spillage.

Remove:
- the servo pump
- the connector from the sensor
- the thermostat housing from the cylinder head.

Replacing the thermostat
Remove the cover and the thermostat.
Install a new thermostat with a new gasket.

Note! Ensure that the thermostat is positioned correctly in the thermostat housing.

Installing the thermostat

Caution! For tightening torques not in the text, see Tightening torque Tightening Torque.

Install:
- the thermostat housing. Use a new gasket
- the connector for the sensor
- the servo pump
- the delivery line for the power steering pump
- the upper timing belt cover.

Finishing
Remove the hose clip.
Fill with coolant.
Install the cap on the expansion tank.
Test drive the engine until the thermostat has opened.
Check for leakage.
Top up the coolant and oil if necessary.