K 1500 Truck 4WD V8-6.5L DSL Turbo VIN S (1999)
Thermostat: Service and Repair
Thermostat Replacement
Removal Procedure
1. Drain the coolant until the radiator coolant level is below the thermostat. Refer to Draining and Filling Cooling System.
2. Disconnect the radiator inlet hose.
3. Remove the following components:
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The bolt
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The stud
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The coolant outlet (4)
4. Remove the gaskets (3).
5. Remove the thermostats (2) from the housing.
6. Clean the sealing surfaces of the thermostat housing and the coolant outlet.
Installation Procedure
1. Install the thermostats (2) into the housing. Replace both thermostats to ensure that the cooling system functions properly.
2. Install the gaskets (3) into position.
3. Install the coolant outlet.
Notice: Refer to Fastener Notice in Service Precautions.
4. Install the bolt and the stud.
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Tighten the bolt and the stud to 42 Nm (31 ft. lbs.).
5. Connect the radiator inlet hose.
6. Refill the coolant into the cooling system. Refer to Draining and Filling Cooling System.
7. Start the engine. Run the engine with the radiator cap removed, until the upper radiator hose becomes hot (This indicates that the thermostat is still
open).
8. With the engine idling, add coolant to the radiator until the coolant level reaches the bottom of the filler neck.
