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To replace the thermostat in a 1998 Cadillac Catera, first ensure the engine is cool and disconnect the negative battery cable. 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 aligned, and reassemble by reversing the steps. Finally, refill the cooling system with the appropriate coolant and check for leaks.

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5d ago

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