gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Thermostat, Engine Cooling|Service and Repair|Page 2228 > < Temperature Sensor (Gauge)|Description and Operation
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Thermostat: Service and Repair

Thermostat Replacement (4.3L) 

Removal Procedure 

1. Remove the air cleaner and the duct assembly. 
2. Partially drain the coolant.      
3. Remove the coolant recovery reservoir. 
4. Disconnect the radiator hose from the thermostat housing.

5. Remove the bolts attaching the thermostat housing to the thermostat.
6. Remove the thermostat housing.
7. Remove the thermostat.
8. Clean the gasket mating surfaces.

Installation Procedure 

Notice:  Refer to Coolant Addition Notice in Service Precautions.

1. Install the thermostat.

Thermostat, Engine Cooling|Service and Repair|Page 2228 > < Temperature Sensor (Gauge)|Description and Operation