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Fans not turning on!!

This is a discussion on Fans not turning on!! within the General Help forums, part of the LSx Technical Help Section category; been having a problem with the car heating up. i changed the thermostat and that didnt help. i checked the ...

  1. #1
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    Fans not turning on!!

    been having a problem with the car heating up. i changed the thermostat and that didnt help. i checked the water pump and its not leaking. I also checked the head gasket and thats good too. I let the car sit at idle after running it hard and the fans didnt come on at all! I was just curious if you can just run a toggle switch for the fans to turn on and off?

  2. #2
    Senior Member Too Fast's Avatar
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    More details please. What is your actual temperature? Can you access that with a scan tool? I think they won't be commanded on until 225 or so.

  3. #3
    Blown, Stroked, & Sprayed

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    Turn on the AC and see if the fans come on.

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    the temp gauge usually goes a little past half way. but its weird cause when i go at high speeds and long distances it gets closer to the 7/8 mark.

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    Senior Member Too Fast's Avatar
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    You need to see your actual temperature. Could be a faulty gage/sending unit, air in your cooling system. Also, like Ed says see if they come on with AC on. They won't immediately, the high side of your AC must build some pressure first, so give the engine a 1500 or so high idle with your AC on to check the fans that way.

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    turned on the ac and the fans kicked in. have any ideas? i can smell coolant so i'm pretty sure its overheating.

  7. #7
    Senior Member bigrondownhiller's Avatar
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    Could be the radiator cap.

  8. #8
    Senior Member Orcus79's Avatar
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    What does the temp do at a stop VS moving?

  9. #9
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    the temp stays around half way, a few degrees lower. you would think it would overheat all the time? no matter how far or fast you would go. why would it just go up after going at high speeds and long distances?

  10. #10
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    Quote Originally Posted by mrz28m6 View Post
    the temp stays around half way, a few degrees lower. you would think it would overheat all the time? no matter how far or fast you would go. why would it just go up after going at high speeds and long distances?
    if your temp is going up during driving, or highway driving your air dam might be obsturcted, or your plastic lip on the bottom of the car could be missing or broken, I would remove the pushlocks at the bottom of the bumper, and remove all the bugs/leaves. etc... out of the radiator's panel. your car shouldt heat up while driving (instead it should cool down once you start gong over 40mph) unless you have a leak, bad thermostat, Air in the Radiator, Bad AC Condencer or Compressor, or broken Heater Core.

    If the temp is still rising you could have a faulty Thermostat. and if you still smell Radiator Fluid try checking the heater core it might be broken.

  11. #11
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    took the thermostat out completely now so i know thats not it. i will check the other stuff though thanks.

  12. #12
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    i took that plastic lip off, but what would that have to do with anything? the car was overheating prior to that

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    Moderator Cutlass's Avatar
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    Overheating while driving means your not getting airflow to the radiator or you have a headgasket failure. Radiator airflow comes from under the car. Its hits the air damn and shoots up through the AC condensor and radiator. do you still have an air damn? If so you can take off the upper rad support and see down the radiator to see if its all clogged up with dust, dirt, leaves, etc and clean it out.

  14. #14
    Moderator Cutlass's Avatar
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    Low speed fan comes on at 226 F and High speed fan comes on at 234 F

  15. #15
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    took the car out and lasted about 20 miles until is basically hit the red zone! popped the hood and the radiator cap was bubbling pretty loud. i'm leaning towards a water pump but why isnt it leaking and why doesnt it overheat all the time?

  16. #16
    Blown, Stroked, & Sprayed

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    Air in the system?

  17. #17
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    ed whats the best way to get rid of the air? i did change one of the radiator hoses.

  18. #18
    Single Malt rbob93's Avatar
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    www.installuniversity.com

    follow the re-fill instructions given in the thermostat install
    Air in the system will definately cause an overheat condition

  19. #19
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    i'm going to try that tomorrow bob. thanks again and i'll let ya know the result!

  20. #20
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    +1 air in the system

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