Pontiac 24506986 Thermostat,Engine Coolant(W/Gasket)

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If the upper radiator hose is hot, it means that the coolant is circulating and the thermostat is open.

Take note of how the thermostat is installed.

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.

Ensure that you use a replacement thermostat with the correct opening temperature.

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

The thermostat is a valve in the engine that controls coolant temperature. To replace or test it, disconnect the negative battery cable and remove the air cleaner. Drain the coolant, but not from the engine. Disconnect the upper radiator hose and the smaller by-pass hose from the thermostat housing. Remove the housing bolts and lift the housing to reveal the thermostat. If there's a TVS switch, disconnect the vacuum hoses and unscrew the switch. Note the thermostat's position before removing it. Clean the old gasket from the housing and engine, then apply a bead of sealer around the engine's sealing surface. Place the thermostat and housing back, tighten the bolts, and reinstall the TVS switch and hoses. Reconnect the battery cable, refill the radiator with antifreeze and water, and run the engine until the upper radiator hose is hot, indicating the thermostat is open. Top up coolant if needed, then replace the radiator cap.

Yes, it comes with an o-ring

The opening temperature for this thermostat is 195 degrees