Diesel Data: Automotive Repair

Thermostat: Service and Repair

Thermostat

Removal and Installation
1. With the vehicle in neutral, position it on a hoist.
2. Drain the engine coolant.





3. Remove the thermostat housing bolts.





4. Remove the coolant thermostat.
1. Separate the thermostat housing.
2. Remove the coolant thermostat and the O-ring seal.
^ Inspect the O-ring seal. Install a new seal, if necessary.

5. NOTE: The thermostat is indexed and must be returned to the original location.

NOTE: Make sure the new O-ring seal is secure around the thermostat.

To install, reverse the removal procedure.
6. Fill the cooling system.