Subaru 21200AA072 THERMOSTAT

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The thermostat is located at the front of the engine, bolted to the bottom of the water pump and allows for quicker warm-ups and governs the normal operating temperature of the engine. If the thermostat is functioning properly, the temperature gauge should rise to the normal operating temperature quickly and then-stay there, only rising above the normal position occasionally when the engine gets unusually warm. To replace the thermostat, raise the front of the vehicle and support it securely on jackstands, drain the cooling system, place the drain pan under the thermostat housing, remove the bolts and lift off the housing cover, note how the thermostat is installed and pull it out, clean the mating surfaces of the thermostat housing and cover, install a new seal on the thermostat, place the thermostat into the housing with the proper end facing out, carefully position the housing cover, install the bolts and tighten them to the torque listed in the specifications, place the radiator hose onto the housing cover (if removed), install the hose clamp and tighten it securely, refill the radiator with coolant, start the engine and check for leaks around the thermostat housing and the lower radiator hose.