On almost all cars, the thermostat housing is right where the top radiator hose meets the engine itself. Drain 50% of the coolant,remove the housing bolts, remove the thermostat (note how it is positioned so you don't put the new one in upside down) scrape the old gasket material off the engine and housing, put new thermostat in, put new gasket in place, attatch housing with bolts (don't overtighten)...and refill with coolant. If there is a screw on the housing, start car, loosen screw until coolant starts to come out with no bubbles. This will bleed air out of the system so the motor doesn't overheat.
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