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Should be located in a removable housing at the engine end of the upper radiator hose Drain about 1 gallon of coolant from radiator
Remove housing
Make note how thermostat is installed
Clean both surfaces
Replace thermostat and gasket
Re-fill coolant slowly to prevent an air lock
Start engine and look for leaks
Run engine to normal operating temperature with heater on
Re-check coolant level
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How do you replace the thermostat on a 1997 Pontiac grand am 3.1?
To replace the thermostat on a 1997 Pontiac Grand Am 3.1, first disconnect the negative battery terminal and loosen the clamp on the radiator hose. Next, remove the mounting bolts from the thermostat housing and insert the new thermostat.
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