Cadillac 24420653 Thermostat,Engine Coolant

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Before assuming the thermostat is to blame for a cooling system problem, it is important to check the coolant level, the drive belt tension, and temperature gauge operation. The replacement process varies depending on the engine type and model year. For a four-cylinder engine, the steps involve disconnecting the negative battery terminal, draining the cooling system, removing the water pump drain bolt, separating the thermostat housing cover from the water pump, removing the inner sleeve and thermostat, and then installing the new thermostat and reassembling the components.

Before replacing the thermostat, inspect the coolant level, drive belt tension, and temperature gauge operation. In 2004 models, remove the exhaust manifold heat shield, drain the coolant, remove the thermostat cover, and replace the thermostat. For V6 models, remove the intake manifold, and disconnect the radiator hose.

Start by disconnecting the cable from the negative battery terminal and draining the cooling system. If the coolant is in good condition, it can be saved and reused.