Buick 10207373 Thermostat,Engine Coolant

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The gasket should be secured in place using the retainer bolts.

Remove the thermostat from the cylinder head and any gasket or sealer. To replace the thermostat, drain the cooling system below the level of the thermostat, and remove the two bolts holding the water neck in place. After removing the water neck, lift out the thermostat. Clean the mating surfaces of both the intake manifold and the water neck of residual gasket material or sealer. Install the thermostat with the wax pellet downward. Coat both sides of the gasket with sealer and install it on the block. Secure in place using the retainer bolts.

The thermostat is designed to open and close at predetermined temperatures to allow coolant to warm up or cool the engine.

The only way to test the operation of the thermostat is with the unit removed from the engine. In most cases if the thermostat is suspect it is more economical to merely buy a replacement thermostat as they are not very costly. To test, first remove the thermostat. Inspect the thermostat for excessive corrosion or damage. Replace the thermostat with a new one if either of these conditions is found. Place the thermostat in hot water 25 degrees above the temperature stamped on the thermostat. The water temperature should be approximately 220. When submerged in this water, which should be agitated thoroughly, the valve should be fully open. Now remove the thermostat using a piece of bent wire and place it in water which is 10 degrees below the temperature on the thermostat, or about 185 degrees. At this temperature the thermostat valve should close fully. Reinstall the thermostat if it checks out OK, if not purchase a new thermostat of the same temperature rating.

If the engine takes a long time to warm up, it is likely that the thermostat is stuck open and should be replaced.

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

Before removing the thermostat, it is important to take note of its position.

If the thermostat checks out OK, it should be reinstalled.

The only way to test the operation of the thermostat is with the unit removed from the engine.

To remove the thermostat, you need to disconnect the negative battery cable, remove the air cleaner for better access, drain the coolant into a suitable container, disconnect the upper radiator hose from the thermostat housing, and remove the housing bolts.

Begin by draining about three quarts of coolant from the radiator until the level is below the thermostat housing. Disconnect the upper radiator hose from the thermostat housing cover. Remove the nuts/bolts holding the cover and lift it off. It may be necessary to move the belt tensioner bracket aside and tap the cover with a soft-face hammer to break the gasket seal. Note the orientation of the old thermostat and then lift it out. Use a scraper or putty knife to remove any old gasket material and sealant from the mating surfaces, being careful not to let any fall into the coolant passages. Clean the mating surfaces with lacquer thinner or acetone. Apply a thin layer of ATV sealant to the gasket mating surfaces of the housing and cover. Install the new thermostat in the engine with the correct end facing up. Position a new gasket on the housing, ensuring the holes line up with the bolt holes. Carefully position the cover on the housing and install the bolts, tightening them to the specified torque without overtightening to avoid distortion. Reattach the radiator hose to the cover and tighten the clamp. It is recommended to check and replace hoses and clamps at this time. Refill the system with coolant. Run the engine and carefully check for any coolant leaks.

Remove the thermostat from the housing.

If the thermostat fails the tests, a new thermostat of the same temperature rating should be purchased for installation.

If there is a TVS switch installed in the thermostat housing, disconnect each of the vacuum hoses on the switch and then unscrew the switch from the housing.

Complete the installation process.