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To replace the thermostat on a 2003 Lincoln Aviator, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, remove the old thermostat, and clean the mating surfaces. Install the new thermostat with the spring side facing the engine, reassemble the housing, reconnect the hose, refill the coolant, and reconnect the battery.

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2mo ago

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