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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 the radiator
Remove this housing
Note how thermostat is installed
Clean both surfaces
Replace thermostat and gasket
Re-install housing
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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