Thread: Fans come on as soon as the car starts

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  1. #1 Fans come on as soon as the car starts 
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    I have a 2001 pontiac grand prix 3.8 n/a only mod is a WAI i got off ebay, the one day out of the blue starting running very cold about 160-175 consistently before I would be running at around 195-210, I did out some hyper lube in it but I dont think this would cause the fans to always run as long as the car is on I always thought the fans would cut on at 195 but this car's fans come on as soon as you start the car
    Anyone ever heard of this happening?
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  2. #2 Re: Fans come on as soon as the car starts 
    GTP Level Member Oxfire's Avatar
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    Mine did that, it ended up being a stuck open thermostat. Same year, same engine. Also I should note it didn't throw an engine code until about a month or two after it was going on.
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  3. #3 Re: Fans come on as soon as the car starts 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by mirving171 View Post
    I did out some hyper lube in it but....
    What is hyper lube and where did you put it? The fans should kick on around 220 or something. Are your defrosters on?
    It's a CUMMINS Dodge not a Dodge Cummins
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  4. #4 Re: Fans come on as soon as the car starts 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Stock fan settings are 214º and 226º IIRC.

    AC "on" will cause fans to run.

    Stuck open thermostat? For why it was running to cool?

    Possible sensor and or wire problem maybe?

    SMGPFC Member #1
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  5. #5 Re: Fans come on as soon as the car starts 
    Turbo is the way to go. BillBoost37's Avatar
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    I'm on the stuck thermostat band wagon
    I'm also on the ac or bad temp sender wagon
    Hell...I'll get on the beer wagon too.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  6. #6 Re: Fans come on as soon as the car starts 
    Florida Tuner Z34Phoenix's Avatar
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    where is that beer wagon... it never comes around here!

    96 Z34 (RIP LQ1 14.81@92.3) L36 Swap 14.9@91.5 www.cardomain.com/id/z34phoenix
    Topswap: P&P All,Si Valves,L76's,LW Pushrods,SD's,DHP PT PB 13.91@99.8
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  7. #7 Re: Fans come on as soon as the car starts 
    GTP Level Member Oxfire's Avatar
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    It's so weird that the engine, in my case, didn't throw a code for a month or so after this same issue happened with me. Needless to say, as everyone here has advised, a) Check defrosters, AC what not to make sure none of 'em are on, then move on to T-Stat and gauge accordingly. Hope you solve it! Get her running warm again!
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