Thermostat: Service and Repair

REMOVING AND INSTALLING COOLANT THERMOSTAT


Drain some of the coolant.






Unscrew cover (1).

Installation!
Bleed the Cooling system.






Remove thermostat.

Installation:
Clamp on the thermostat faces out.

Replace rubber ring (2).

Since 1986 Models:

New thermostat housing:
Install thermostat no.1 713 040 (smaller valve seat diameter).






Checking Thermostat:
Check whether opening temperature agrees with the value in the specifications.
Check opening temperature in a hot water bath and compare value with the stamped opening temperature value.