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Where is the thermostat in a 1998 GMC Jimmy?

I want to replace the thermostat in a 1998 GMC Jimmy. I cannot get heat or defrost, and it is now overheating. I cannot locate the thermostat. And if you can tell me where it is, could you give me a brief tutorial on replacing it?

Thank you very much,

C. Lehnig

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Cynthia, not exactly sure which engine your Jimmy has, here are the instructions for a 4.3 6cyl. The thermostat is located on the intake manifold at the end of the upper radiator hose. There is a little housing there with two bolts ,and thermostat is in it. "To replace it you'll need the following: 1) Thermostat 2) coolant 3) A closed container for holding drained coolant 4) possibly RTV sealant, keep it on hand just in case 4) 3/8" drive 10mm and 12mm deep socket,and a 3/8" ratchet 5) extension bar 6) 10mm open ended wrench 7) 1/2" deep socket. Take the air intake cover off. - Remove the two brackets which hold the throttle wires. Remove the two bolts securing the thermostat housing. Lift the housing and move out of the way. Remove the thermostat. If it remains in place, remove the rubber gasket from the engine. Be careful not to mar the metal, or get any gasket material in the opening to the cooling system. Stuff a rag into the opening if need be. Replace the thermostat. Torque the bolts down with 18 ft. lbs. of pressure". Refill cooling system and run the engine for a while to be sure it all worked out okay. Hope this helps, good luck.

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And I would add look at the unit you are replacing and make sure you install the new one correct side up. +

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There is no need for quite all at work. All you need to remove is the air induction, the throttle cables and others mentioned can remain in place.

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@drewfra2004 the original answer only stated "Remove the two brackets which hold the throttle wires. Remove the two bolts securing the thermostat housing. Lift the housing and move out of the way. Remove the thermostat." Does not look like there are any additional steps and no more than you suggested.

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Cynthia will be eternally grateful.
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