Thermostat: Service and Repair

Coolant thermostat, checking, removing and installing

Note: Always replace seals and gaskets.

Removing
- Drain coolant system. Service and Repair

Vehicles with air conditioning:

WARNING! The air conditioning refrigerant circuit must not be opened.

- Unbolt front engine cover support from intake manifold.
- Detach retainers for refrigerant hoses.




- Unbolt A/C compressor, lift clear together with refrigerant hoses (do not disconnect) and tie in place on hood lock.

All vehicles:



- Disconnect coolant hose from connection -3-.
- Unscrew bolts -4- and remove connection, O-ring -2- and coolant thermostat


Installing
- Clean and smooth down sealing surface for O - ring as required.
- Insert coolant thermostat.
- Installation position: bowed metal strip on thermostat must be vertical.
- Moisten new O ring with coolant G 012 AS D.
- Tighten bolts.
- Fill up with coolant. Service and Repair


Tightening torque
Connection to cylinder block: 15 Nm


Testing coolant thermostat

- Heat thermostat in water bath.



1) Cannot be tested