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post #1 of (permalink) Old 12-07-2007, 06:15 PM
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Question Thermostat wont open, help!

Hey all, brand new to the forum, I have a Ford F-150 4x4 shortbed with a 302 in it. I have recently tried putting a new thermostat in, and it wont open up at 180f. I tested both the thermostats I have, and they tested fine. But when I put it in the truck it wont open up, all the coolant in the radiator and hoses stays cold and the block gets hot, and I have had the block up over 180f. Then when I take it back out and let it free flow, it works fine, accept obviously I don't have any heat and I cant get it up to operating temp. Everything flows fine , heater works fine but I cant put the stat in. Someone told me that it could be some sort of vapor lock , like air getting in somewhere and making a pocket behind the stat somewhere and not letting the stat open. Anyone have any insight on this, I'm at a dead end. Thanks
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post #2 of (permalink) Old 12-10-2007, 06:01 PM
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Are you sure you're not installing the thermostat backwards? Sometimes it is hard to tell which way is which....

If turning it around doesn't work, then try drilling a very small (about 1/8") into the thermostat valve surface itself to "burp" any air trapped in the manifold.

Good Luck!!
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