Engine - Coolant Temperature Sensor/Switch: Service and Repair

Engine Coolant Temperature Sensor (G62)

Special tools, testers and auxiliary items required

• Torque Wrench (5-50 Nm) (V.A.G 1331)

Removing

Conditions:

• Engine is cold.

- Remove the cover for the air duct; disengage the side clips to do so - arrows -.






- Unclip the air duct from the lock carrier air duct, disengage the clips to do so - arrows -.






- Remove both the intake air duct and the lower air duct.

- Remove the charge air pipe from the noise generator, if equipped.

- Loosen the hose clamp - 2 -.






- Remove the bolt - 4 -.

- Disconnect the electrical connector - arrow -.

- Remove the noise insulation.

- Disconnect the charge air hose by lifting the clamp - 1 - and loosening the hose clamp - 2 -.






- Seal off the connections on the charge air cooler with a clean cloth.

- Remove the bolt - 1 - and remove the charge air pipe downward.






- Remove the throttle valve control module. Refer to => [ Throttle Valve Control Module (J338) ] Removal and Replacement.

- Remove the intake manifold support by removing the nut - 2 - and bolt - 1 -.






Engine Coolant Temperature (ECT) Sensor with a Clip:






- Disconnect the connector - 1 - from the ECT sensor.

- Remove the ECT sensor - 2 -, to do so, press the latches - arrow -.

• Install the new ECT sensor with O-ring as quickly as possible to prevent coolant from leaking out.

ECT Sensor with a Retaining Plate:






- Disconnect the connector - 2 - from the ECT sensor.

- Remove the bolts - arrows - and remove the retaining plate - 1 -.

- Remove the ECT sensor.

• Install the new ECT sensor with O-ring as quickly as possible to prevent coolant from leaking out.

Installing

Tightening specifications, refer to the following:

• => [ Coolant Pump and Thermostat Overview ] Coolant Pump and Thermostat Overview.

• => [ Intake Manifold Overview ] Intake Manifold Overview.

Install in reverse order of removal. When doing this note the following:

• Replace the O-ring.

- Clean the O-ring sealing surface.

- Check the coolant level. Refer to => [ Draining and Filling ] Service and Repair.