Pontiac 24577299 Thermostat,Engine Coolant

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To remove the thermostat, start by draining about 1 gallon of coolant from the radiator until the level is below the thermostat housing. Then, remove the air intake duct and disconnect the radiator hose from the thermostat cover. Next, remove the bolts and lift off the cover, tapping it with a soft-face hammer if necessary to break the gasket seal. Take note of how the thermostat is installed, and then remove it. Make sure to use a replacement thermostat with the correct opening temperature. If a gasket was used, use a scraper or putty knife to remove any old gasket material and sealant from the mating surfaces. To install the new thermostat, ensure the correct end faces out, with the spring directed toward the engine. Use a new rubber gasket or apply a bead of RTV to the groove in the coolant outlet sealing surface if no gasket was used. Carefully position the cover and tighten the bolts to the specified torque, being careful not to over-tighten and risk cracking or distorting the cover. Reattach the radiator hose and tighten the clamp, and consider checking and replacing hoses and clamps at this time. Finally, refill the system, run the engine, and carefully check for any leaks.

Begin by draining about three quarts of coolant from the radiator until the level is below the thermostat housing.

Check the coolant level in the system. Verify the drivebelt tension is correct. Observe the temperature gauge or light operation. If the engine takes a long time to warm up, it may indicate a thermostat stuck open and needs replacement. If the engine runs hot, and the upper radiator hose isn't hot, it suggests a thermostat stuck shut and should be replaced. If the upper radiator hose is hot, it indicates that the coolant is circulating and the thermostat is open.

Use a new rubber gasket or apply a bead of RTV to the groove in the coolant outlet sealing surface.

Place a 1/3 inch bead of RTV or equivalent sealer around the sealing surface on the engine and place the thermostat into its recess. Immediately place the thermostat housing with sealer and a new gasket into position and torque-tighten the attaching bolts. Where applicable, install the TVS switch and vacuum hoses.

Disconnect the negative battery cable.Drain the cooling system below the thermostat level.Remove the upper radiator hose from the water outlet housing.

The expected cooler water temperature for most cases is 185 degrees.

Complete the installation process.