gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Thermostat, Engine Cooling|Specifications|Page 4757 > < Thermostat, Engine Cooling|Specifications
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Thermostat: Service and Repair

Removal Procedure

1. Drain the coolant until the radiator coolant level is below the thermostats. Refer to Draining and Filling Cooling System.
2. For the 5.7L only, remove the following items:

2.1.

The bolts or studs

2.2.

The coolant outlet

2.3.

The thermostat from the housing

2.4.

The gasket, If needed

3. For the 7.4L only, remove the following items:

3.1.

The bolts or studs

3.2.

The coolant outlet

3.3.

The thermostat from the housing

3.4.

The gasket, if needed

4. Clean the thermostat housing and the cooling outlet sealing surfaces.

Installation Procedure

Thermostat, Engine Cooling|Specifications|Page 4757 > < Thermostat, Engine Cooling|Specifications