Question about 1991 Toyota Pickup

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My 91 Toyota pickup overheats in hot environment. I travel back and forth from California to Arizona and every time I get to Arizona the temp goes up especially when I turn on the AC. I have already replaced the thermostat with a fail safe one but that did not solve the problem. Any suggestions?

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Hi,

Couple of things:

Is the most likely problem the thermostat? If so, could someone tell me where exactly it is located on the 84 pickup? Is there a way to "unstick" it if it's stuck closed, or is it best just to replace it?

If not the thermostat, other than a coolant/radiator leak.

Look to the left of the valve cover. You can take the thermostat out and try running it without it. If it still gets hot, then it's not the thermostat. Check the fan clutch . This all assumes you've checked coolant level. Sometimes the radiator cap causes problems. If it doesn't hold pressure then it can reduce the boiling point of the coolant, but I would look at the above items first. How does the engine run, any white vapors coming from the exhaust after it warms up? Thanks for contacting Fixya.

Posted on Jun 30, 2009

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