Engine - Coolant Temperature Sensor/Switch: Service and Repair

Replacing The Thermostat And/Or Engine Coolant Temperature Sensor

Special Tools: 951 2885

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 socket 951 2885.

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 socket 951 2885
- 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.

- 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

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.