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To change the thermostat in a 2003 Mazda 6, first, ensure the engine is cool and disconnect the negative battery terminal. Drain the coolant from the radiator, then remove the upper radiator hose and the thermostat housing bolts. Replace the old thermostat with a new one, ensuring the gasket is properly seated, and reassemble by reversing the removal steps. Finally, refill the coolant and check for leaks.

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1mo ago

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