Blower fan always runs high

Discussion in 'Troubleshooting & Diagnosis' started by my71bmf, Apr 30, 2021.

  1. my71bmf

    my71bmf Veteran Member

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    1971 Camaro, just coming out of hibernation so to speak. Regardless of my switch setting, my blower motor stays running as if it were in the high setting. Any ideas what to check? Don't really need full blast heat when it's 80+ degrees.
    TIA.
     
  2. Jodi

    Jodi Veteran Member

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    Its more than likely the resistor went bad, check that one first. Good luck!

    Rbcb1e8ffeff25b9b597a683fd68528f1.jpg
     
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  3. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    The contacts in the relay are probably stuck.
    When the switch is flipped to the High setting, the resistor pack is bypassed.
     
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  4. Gary S

    Gary S Administrator Lifetime Gold Member

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    Does the car have A/C or not? With A/C, the resistor is mounted in the heater box under the hood. Without A/C, the resistor is likely part of the fan switch in the dash.
     
  5. my71bmf

    my71bmf Veteran Member

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    The relay thing kinda makes sense. I'll try to find it. Been a while sense I have messed with that system. 20+ years.
    It was an A/C car, now just a heater only car. So the wiring is a/c, but looks and operates as a heater only car. (Changed heater box, and such)
    Thanks guys!
     
  6. kenny77

    kenny77 Veteran Member Lifetime Gold Member

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    Change the resistor. It's on the blower housing
     
  7. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    The resistor pack may have been removed when the A/C system was deleted.

    That’s the part which controls the speeds.
     
  8. Gary S

    Gary S Administrator Lifetime Gold Member

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    If the relay is stuck, the fan will run on high speed all the time as it bypasses the resistor pack when it sticks.
     
  9. my71bmf

    my71bmf Veteran Member

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    I know I didn't remove the resistor pack. Just gotta remember where I put it. Hopefully get to look into it today.
     

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