Buick 24505924 Thermostat Assembly, Engine Coolant (W/ Gasket)

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The two bolts holding the water neck in place should be removed.

To diagnose cooling system issues, first check the coolant level, drivebelt tension, and temperature gauge or light operation. If the engine takes too long to warm up, the thermostat may be stuck open, and it should be replaced. If the engine runs hot and the upper radiator hose isn't hot, the thermostat might be stuck closed, requiring replacement. It is essential not to drive the vehicle without a thermostat to avoid negative impacts on emissions and fuel economy. To replace the thermostat, disconnect the negative battery cable and drain the cooling system. Remove the air cleaner assembly for access, and follow the upper radiator hose to locate the thermostat cover. Loosen the hose clamp and detach the hose from the fitting. If the hose sticks, twist it with pliers to break the seal or replace it with a new one if needed. For specific engine models, additional steps may apply, such as relieving fuel system pressure or removing heater hose brackets. Detach the thermostat cover, remove the old thermostat, and clean the gasket mating surfaces. If equipped, replace the rubber gasket or apply RTV sealant to both sides of the new gasket for certain models. Install the new thermostat, ensuring the correct end faces up, and apply RTV sealer to bolt threads if required. Reassemble all components and refill the cooling system, making sure to bleed the system of air. Start the engine, allow it to reach normal operating temperature, and check for leaks and proper thermostat operation.

After lifting the thermostat housing from the engine, the thermostat will be visible and can be removed from the engine.

After observing the thermostat in hot water, it should be removed and placed in water that is 10 degrees below the temperature on the thermostat.

The opening temperature for this thermostat is 195 degrees