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Thread: are oem thermostats fail safe open ?

  1. #1
    Join Date
    Apr 2007
    Location
    miami , FL
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    are oem thermostats fail safe open ?

    are the stock motorcraft t-stat fail safe open ?? , if so if they do fail should the copper cylinder inside the t-stat seat flush or popped out ?

  2. #2
    Join Date
    Feb 2005
    Location
    Tampa, FL
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    801
    Absolutely not.. Why would they be Ford wants to sell you parts or new cars. Go to Autozone they sell failsafe thermostats CHEAP. It is the only to go.

  3. #3
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    Apr 2007
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    miami , FL
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    i got one from autozone, but it doesnt lock in place like the motorcraft one , makes it a pain to install it on the manifold..

    i was just asking because i installed a used motorcraft instead of the fail safe one, but i noticed the copper cylinder sticking out

  4. #4
    Join Date
    Feb 2005
    Location
    Tampa, FL
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    801
    Maybe I missed some thing or your car is different but the one I got for my 94 is a direct replacement.Other than the gasket its pretty much a standard replacement.?????

  5. #5
    Join Date
    Apr 2007
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    miami , FL
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    so yours locks in the thermostat housing? i did some research and apparently the only ones that lock are the oem ..

  6. #6
    Join Date
    May 2002
    Location
    Dallas, TX
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    5,474
    Fail safe locks the thermostat in the open position the first time the car overheats. Why??? I guess they figure that it may not operate right again and that it would otherwise stick closed causing the car to... well.. ummm.. overheat.
    I used one for a while and decided it was a piece of junk. I went back to a normal one.

    As for installation, just use some RTV around the edge to hold it in place.
    Red 90 SC/AOD- Primary DD. Restored.
    Black 90 SC/5 Spd- 2nd DD Restored.
    White 90 SC/AOD- w/290,000.. retired

  7. #7
    Join Date
    Apr 2007
    Location
    miami , FL
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    cool thanks ,ill just keep the oem in there don't want to play with the housing anymore ,what would be an indication of a failed tstat ? really high temps?

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