Question about 2003 Pontiac Grand Prix
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Posted on Apr 21, 2009
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-
Step1 Drain about half the engine coolant into a sealable container. Disconnect the negative battery cable. Step2 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. Step3 Disconnect the clamp on the surge tank inlet hose. Take the hose from the water inlet housing. Step4 Loosen the bolts that secure the water inlet housing then remove them. Lift out the water inlet/thermostat assembly. Install the new Thermostat Step1 Clean the sealing surfaces to remove all traces of gasket material and dirt. Position the new inlet-thermostat assembly on the engine. Step2 Apply RTV Sealer GM#1052366 or a similar product to the bolts before installing them. Tighten the bolts to 80 inch lbs. Step3 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 coolant. Step4 Reattach the negative battery cable. Start the engine and allow it to run until the thermostat opens. Step5 Allow the engine to cool. Test the coolant level and add coolant as needed.
Posted on Apr 21, 2009
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Posted on Jan 02, 2017
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