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Partially drain the radiator into a container. Remove the upper hose at the engine end. Remove the 2 bolts that hold the thermostat housing and remove the thermostat. Clean both surfaces and install the thermostat, install the housing and the 2 retaining bolts. install the upper radiator hose and top off the coolant. It is located at the engine end of the top radiator hose in the thermostat housing.

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Q: How do you change a thermostat on 04 Chevy Impala?
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