Thermostat: Service and Repair

REMOVAL

WARNING: Do not remove the radiator cap while the cooling system is hot. Serious personal injury may result. Only remove the radiator cap from a coo/ engine.

1. Remove the necessary amount of coolant from the radiator.
2. Remove the upper radiator inlet hose.





3. Remove the coolant outlet nuts.





4. Remove the coolant outlet from the engine.
5. Remove the thermostat gasket, if used.





6. Remove the coolant thermostat.
^ Cleaning Procedure
- Clean all the parts.
- Clean all the sealing surfaces.

INSTALLATION
1. Install the thermostat to the engine.
2. Install the new thermostat gasket (if used).
^ Otherwise, place a 3 mm (1/8 inch) bead of RTV sealer (GM P/N 1052289, or equivalent) in the groove of the coolant outlet sealing surface.
3. Install the coolant outlet to the engine.
4. Install the coolant outlet attaching nuts.
^ Tighten the coolant outlet nuts to 10 Nm (89 inch lbs.).
5. Install the upper radiator inlet hose.
6. Fill the cooling system with the specified coolant and concentration.
7. Inspect all of the sealing surfaces and the connections for leaks after starting the engine.