coolant temp gauge goes all the way down
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Cadillac STS Forum - 2005 through 2012 Discussion, coolant temp gauge goes all the way down in Past Cadillac Vehicle Discussion; I've noticed last year or 2 years ago that if I turn my climate control past 80 sometimes the coolant ...
  1. #1
    Charles Warren's Avatar
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    coolant temp gauge goes all the way down

    I've noticed last year or 2 years ago that if I turn my climate control past 80 sometimes the coolant temp gauge drops and the fans come on and stay and check engine light comes on but when I scan there is no code, anybody else get this??? 06 rwd 4.6

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    carter's_sts is online now Cadillac Owners Connoisseur
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    Guessing low coolant or a bad coolant thermostat.

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    Charles Warren's Avatar
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    Re: coolant temp gauge goes all the way down

    coolant level is fine, but never changed t stat might just go ahead and do that. I know on my 03 cts the t stat is stuck open and the light stays on and that t stat is too much for me to change so I'll deal with it but on here it doesnt look too bad to change. Might as well flush system even though I flushed it last year

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    My guess would also be a bad tstat. Really easy to change on the Northstar. I just did it about 2 months ago.

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    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Sticking thermostats are pretty rare.

    If the CEL is coming on, there IS a code, the scanner is just missing it.

    The fans coming on before their set temp (without an AC function set) is usually the result of a coolant temp sensor code.

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    carter's_sts is online now Cadillac Owners Connoisseur
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    Over in the STS-V forum bad t-stats are pretty common. And the temp gauges go all the way down.

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    Re: coolant temp gauge goes all the way down

    Orange, I have the same problem of temp OK and then drops to Cold and fans come on. Where is t-stat and how hard is it to change?

    Thanks Steve

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    Charles Warren's Avatar
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    Re: coolant temp gauge goes all the way down

    t stat is under the throttle body. if you remove tb you will have acess to it. I need to make time to do mine just didnt think it would cause fans and temp to drop, I might change sensor since i will be dirty lol

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    orange57's Avatar
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    You shouldn't need to remove the tb, just the intake duct. The temp sensor is in a very very tight location. You may not want to replace it if it isn't broken.

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    Charles Warren's Avatar
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    Re: coolant temp gauge goes all the way down

    my brain farted i meant intake and air box. too much jp-8 lol. and i doubt its the sensor anyway now that i thought about it, i do wanna polish the tb but i have another project to tackle this weekend............ the damn freaking diff bushing again, i went poly this time(rev shift)

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