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Follow the upper radiator hose to the engine. Under the housing is the thermostat. Make sure when you put it back together the spring on the thermostat goes toward the engine. GoodluckJoe

This is a followup to the previous answer. After you find the housing and remove the hose, be aware that most of the thermostat housings are made of aluminum or some other fragile metal. Spray the mounting bolts thoroughly with WD-40 or Liquid Wrench (do they still make that?) and let it sit for awhile. If you have a six-point socket, use it to loosen the bolts. In any case, go easy on them. They're fairly easy to break, and you don't want the trauma of trying to remove the remnant. THEN when you reinstall, cover the bolts with anti-seize compound so they will come out easily next time.

PS: After the bolts are removed, the housing still may not want to separate from the manifold. Tap on it gently with a wooden hammer handle or some other device that won't crack it. Eventually you can slip a fine screwdriver or spatula under it to take it off. Be sure to scrape the gasket area clean.

Sorry to be so verbose. Truth is, this is NOT the easiest job to do on these engines.

Follow the top hose from the top of the radiator it is about a 2'' by about 1'6'' long to a hose clamp . Right under the hose clamp is the thermostat housing it has got three 10mm bolts holding it on the engine take that off and there's your thermostat , the thermostat itself has got a split O ring on the thermostat instead of a regular gasket it just pulls out and there you have it. IT DOES NOT HAVE A REGULAR GASKET JUST A O -RING. i DON'T KNOW WHERE THIS GUY COMES FROM TO THINK IT HAS A GASKET!

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Q: How do you replace the thermostat located on a 1986 Ford Ranger 2.9L?
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