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To replace the thermostat in a 2001 Mercury Mountaineer, first, ensure the engine is cool and disconnect the negative battery terminal. Drain the coolant from the radiator, then remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, take out the old thermostat, and replace it with a new one, ensuring the gasket is properly seated. Reassemble everything in reverse order, refill the coolant, and reconnect the battery.

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