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To change the thermostat in a 2009 Ford Fusion, start by ensuring the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing to access the thermostat, replace it with a new one, and reassemble the housing and hose. Finally, refill the cooling system with the appropriate coolant, check for leaks, and reconnect the battery.

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2mo ago

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