Should be located in a removable housing at the engine end of the upper radiator hose (lower hose on a few engines)
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-fill coolant slowly to prevent an airlock
Start engine and look for leaks
Run engine to normal operating temperature with heater on
Re-check coolant level
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remove old thermostat and replace with new thermostat and gasket
Replace your thermostat whenever you replace the coolant and service the cooling system. Also replace it if you suspect it is sticking.
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