Hi, here is a step by step guide that will help you with this replacement of the thermostat. Please make sure you have exhausted
all other trouble zones before initiating this replacement. Check to make sure the water pump is working properly and also, make sure that your cooling fan is cycling on and off in the correct manner and, most important
, make sure the cooling fan is operational and the relay and fuse are good as well. If all is well, proceed with the replacement
of the thermostat as described below.
Remove the old thermostat
Drain about half the engine coolant
into a sealable
container. Disconnect the negative battery cable.
Take the hose clamps from the water inlet housing with a pair of hose clamp pliers. Remove both the radiator hose
and the heater hose from the water inlet housing.
Disconnect the clamp on the surge tank inlet hose. Take the hose from the water inlet housing.
Loosen the bolts that secure the water inlet housing then remove them. Lift out the water inlet/thermostat assembly.
Install the new Thermostat
Clean the sealing surfaces to remove all traces of gasket material and
dirt. Position the new inlet-thermostat assembly on the engine.
Sealer GM#1052366 or a similar product to the bolts before installing them. Tighten the bolts to 80 inch lbs.
Connect the hoses to the surge tank, the heater and the radiator to the
inlet housing. Fill the cooling system with the proper type and mix of
the negative battery cable. Start the engine and allow it to run until the thermostat opens.
Allow the engine to cool. Test the coolant level and add coolant as needed.