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radiator fan isnt working unless a/c is on

This is a discussion on radiator fan isnt working unless a/c is on within the General Help forums, part of the LSx Technical Help Section category; I have a 99 trans am and my radiator fan does not come on unless the a/c is on. My ...

  1. #1
    Junior Member blackTA6585's Avatar
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    1999 Trans Am

    radiator fan isnt working unless a/c is on

    I have a 99 trans am and my radiator fan does not come on unless the a/c is on. My car wont over heat but it will run hotter when the a/c is off and when I turn the a/c on the fans come on and it starts cooling down some. Does anyone know why it would work when the a/c is on but not when its off? Do i need a new fan or is there a way to fix it maybe?

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    Member BKHgto04's Avatar
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    Sounds like you need a cooling fan temperature switch. The fans are supposed to come on when you turn your AC on. This is good because it means your fans are working.

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    Life in the Fast lane sunsetorangess's Avatar
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    Are both fans coming on with the A/C on or just one?
    J
    2001 SS, Its not the car its the Driver that matters....

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    From the factory, low speed cooling fans come on at 226*F and high speed cooling fans come on at 235*F. If you coolant temp isn't running that high then the fans won't come on (unless the AC is on).

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    Member DaddySS's Avatar
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    the fans come on with the A?C irrespective of temperature. With a/c off, they are controlled by temperature sensor and the settingsin the PCM as stated above. if it's not overheating why wre you concerned - is it running hotter than usual?

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