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Depending on which engine you have, this may vary: The most common solution to this is to do this: 1) Remove the negative battery cable 2) Remove the belt 3) Remove the alternator 4) Remove the water pump (don't pollute, catch all that fluid!) 5) behind the pump is the thermostat 6) follow steps in reverse to put back together **Make sure you CLEAN the gasket for the water pump, and replace it with RTV High-heat silicone (or a new gasket, $3)... **Make sure to refill your coolant...

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15y ago
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Q: How do you change the thermostat in a 1999 Pontiac Sunfire?
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