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  1. #1
    Junior Member Agent421's Avatar
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    99' T/A

    Low coolant lamp

    After about 5 minutes of driveing the Low Coolant Lamp comes on....My Overflow Dont ever change and all my gauges read normal....Anyone know what this might be? Also it takes longer to come on when its cooler outside

  2. #2
    Senior Member
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    They go bad all the time, GM finally took them off our cars in '00? You can take it out and try cleaning it, replace it, or just unplug it to keep the light off. It's located in the radiator a few inches below the fill cap. Make sure it's not actually low, open the radiator cap when cold and check the level.

  3. #3
    Junior Member Agent421's Avatar
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    99' T/A

    So you think its just a sencer?

  4. #4
    Life in the Fast lane sunsetorangess's Avatar
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    Met. Sunset Orange
    01 SS

    Just like 2001nbmz28 said, its probly just the sensor, you can try and remove it and clean it but chances are its shot. Common failure.
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  5. #5
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    Artic White
    1999 SS A4

    My low coolant light has been on for about 5 years. Coolant level is fine. I've replaced the sensor once and the light came on again after a year or 2. Just check your coolant regularly and you will be fine.

  6. #6
    11 years of bangin gears cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    If you don't smell coolant, then it's the sensor.

  7. #7
    Junior Member Agent421's Avatar
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    99' T/A

    smell it?



    Its full when its cold

  8. #8
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    2008 Hummer H3

    Maybe a goofy (?) but does your overflow rez have "goop" starting to form @ the end of the dipstick? Reason I ask, is sometimes as coolant begins to age it can get sediment from whatever (aluminum oxidization, steel/iron rust etc,etc). This "goop" will settle @ the bottom of the rez sometimes and plug up the return/overflow tube from the rad to the rez.. Sometimes, what happens is, coolant can flow out of the rad and into the rez under pressure.. BUT can't flow freely back when the engine needs it.. Best way to tell is after the engine is harmed up but not driven yet, pull the rez dipstick and see what the reading is.. If the engine is harmed up but the dipstick reads, "full cold" there maybe a blockage issue as well as a rad cap issue.. Just my .02
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  9. #9
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    2008 Hummer H3

    Oh yeah, it could be something as simple as a piece of the little seal under the coolant bottlecap that has gotten into the pickup hose.. You can disconnect the rez and flush it pretty easily too..

  10. #10
    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    i've heard about the radiator caps crapping out as well...

  11. #11
    Your dealership guy konigandy6's Avatar
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    2008 Corvette Z06

    Quote Originally Posted by Spaz View Post
    i've heard about the radiator caps crapping out as well...
    True, but usually doesn't cause a low coolant light to illuminate. Just causes an overheat since it won't release built up pressure.

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  12. #12
    Member TA98's Avatar
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    1998 Trans Am

    mine used to come on all the time like yours because the coolant had just gotten crappy. i flushed it out two seperate times and havent had an issue since

  13. #13
    Junior Member Agent421's Avatar
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    99' T/A

    I herd something about fake temp gauges in the 99 trans am. Keep thinking its gonna overheat on me and I won't be able to tell. Then again I'm prolly just paranoid. But yea I had it flushed and the lights still on. Hope I figure this out soon.

  14. #14
    Your dealership guy konigandy6's Avatar
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    Velocity Yellow
    2008 Corvette Z06

    Quote Originally Posted by Agent421 View Post
    I herd something about fake temp gauges in the 99 trans am. Keep thinking its gonna overheat on me and I won't be able to tell. Then again I'm prolly just paranoid. But yea I had it flushed and the lights still on. Hope I figure this out soon.
    Not really fake gauges, just "dummy" gauges. Tells you when vehicle is cold, up to operating temp, and overheating... the temp readout is not accurate.

  15. #15
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    Quick Silver
    2002 Z06

    +! for the sensor. If it is full and the temp is always good.

    The sensor is pretty cheap, I'm for replacing it and keeping it like I bought it.

    You can just un-plug it and forget about it though.


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