GM 10190925 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.

Disconnect the negative battery terminal and remove the air cleaner on V6 and V8 engines, labeling all detached hoses. Drain the cooling system below the thermostat level and disconnect the upper radiator hose. Remove the thermostat housing bolts and separate the housing from the engine, possibly removing the alternator bracket first. If a TVS switch is present, disconnect vacuum hoses and unscrew the switch. Remove the thermostat, noting its orientation. Clean old gasket residue from the thermostat housing and engine sealing surface. Apply a 1/8-inch bead of RTV sealant to the engine's sealing surface, place the thermostat, and position the housing with sealant and a new gasket. Tighten the bolts to the specified torque. Reinstall any removed parts, reconnect the upper radiator hose, and reinstall the air cleaner.

After installing the new thermostat, reattach the radiator hose to the cover fitting and tighten the hose clamp.

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

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.

Refill the system, run the engine, and carefully check for any leaks.

Remove the bolts and lift off the cover, tapping it with a soft-face hammer if necessary to break the gasket seal.

Fill it with the appropriate antifreeze/water mixture.

Reattach the radiator hose and tighten the clamp, and consider checking and replacing hoses and clamps at this time.