Engine - Coolant Temperature Sensor/Switch: Service and Repair

WM 197819 Removing and installing coolant temperature sensor





Preliminary work

Preliminary work

1. Drain coolant completely.





Draining coolant

2. Remove intake-air distributor.

Information

Component overview





Installation position of coolant temperature sensor





Component overview

1 - Distributor pipe
2 - Coolant temperature sensor (when removing, collect emerging coolant, when installing, replace sealing ring)
3 - Sealing ring (replace when installing)
4 - 3 screw plugs, M16x1 (when removing, collect emerging coolant, when installing, replace sealing ring)
5 - 10 hexagon-head bolts M6x25
6 - 2 seals for distributor pipe (when installing, clean sealing faces and replace seal)
7 - 4 sealing rings (when installing, grease with Kluber Syntheso GLEP 1
8 - Lower cooling water tube

Removing coolant temperature sensor

Caution:
Danger of poisoning!
Coolant additives and cleaning liquids are toxic.

- Swallowing coolant additives and cleaning liquids must be urgently avoided.

- Do not consume any food or drink while working (danger of accidental mixing).

- If swallowed, observe the warning information on the containers and contact a doctor. If necessary, show the doctor the warning information on the packaging.

Caution:
Danger of scalding with hot coolant!

- Never open the cooling system when it is hot. Emerging coolant may be very hot and can cause scalding.

- The cooling system must be depressurized before being opened.

- Allow engine to cool down.

1. Pull off cable plug of the coolant temperature sensor -arrow-.





Cable plug of the coolant temperature sensor

Information:
Even when the coolant has been completely drained, coolant emerges from the open bore on the coolant temperature sensor!

2. Unscrew the coolant temperature sensor using a ring wrench (a/f 22) -see picture-. Absorb emerging coolant.





Unscrewing the coolant temperature sensor

Installing coolant temperature sensor

1. Clean sealing surfaces and screw in coolant temperature sensor with a new sealing ring into the distributor pipe. - Tightening torque: 22 ftlb.





Screwing in the coolant temperature sensor

2. Fit cable plug again -arrow-.





Cable plug of the temperature sensor

Subsequent work

Subsequent work

1. Install intake-air distributor.
2. Fill up completely with coolant and bleed system.