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Examined my cooling system. Fans are not turning on..

This is a discussion on Examined my cooling system. Fans are not turning on.. within the General Help forums, part of the LSx Technical Help Section category; Ok so i replaced the busted hose I had causing a coolant leak with a barb and 2 clamps.. and ...

  1. #1
    Junior Member Hollo's Avatar
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    Examined my cooling system. Fans are not turning on..

    Ok so i replaced the busted hose I had causing a coolant leak with a barb and 2 clamps.. and I examined the entire system, the leak is now fixed (i will definitely see after I drive around).. But my fans are not even coming on at all. and the temp got into the red after I let it idle for awhile, so it had a chance to turn the fans on. Where do I begin to check, trial/error?

    Also, when I first go for a drive (this has been happening since before I replaced this hose) The temp will climb up into the red zone about 260, and then all of a sudden after a few minutes of driving the temp will drop down to around 180-190 and stay there, which I'm guessing is when the thermostat is opening. Is that a bad water pump causing that or what?

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    Ricekiller z28punk's Avatar
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    find the relays that control the cooling fans. there should be 3 of them. put a jumper wire across the relays to turn them on. if they dont work on any of them, then replace the fans. if they do work then it will get a little trickier

    sorry in advance for the oversized image
    Last edited by z28punk; 11-27-2007 at 10:19 PM.

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    Ricekiller z28punk's Avatar
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  4. #4
    Junior Member Hollo's Avatar
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    I swapped a few relays around, and they still didnt work.. When I turned the AC on.. which it's supposed to..

  5. #5
    Senior Member bigrondownhiller's Avatar
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    could be the sensor on the block that tells the computer what temp the engine is at.

  6. #6
    Blown, Stroked, & Sprayed

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    I would check the thermostat.

  7. #7
    Junior Member Hollo's Avatar
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    Thermostat was installed no more than 3k miles ago. Is there a way to test the coolant temp sensor without replacing it?

  8. #8
    Senior Member 35thAnniZ28's Avatar
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    eating bulldog
    son of biscuit

    thermo might bec stuck

  9. #9
    Blown, Stroked, & Sprayed

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    Then you probably still have air in the system.

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