79 z28 blower motor relay clicks but no blower

Discussion in '1978 - 1981 Specific' started by Mrwalleyeman, Mar 17, 2020.

  1. Mrwalleyeman

    Mrwalleyeman New Member

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    So I have been trying the last few days to get the heater working on my sons camaro. so far I have tested and have power at the switch and power to the relay and power to the brown wire going to the blower motor, haven't gotten to the blower motor yet. But when you flip the switch on the dash you can hear the relay clicking. So I don't know if that is normal or not. I think we need to replace the blower motor. Any ideas would be helpful. Thanks
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    The relay should activate when you switch to high speed. When that happens, you get power out of the line from the relay to the motor. If it gets out of the relay and not to the motor, trace the wire. Most GM cars had an inline plug between those two places. This plug wasn't heavy enough to handle the current of the motor for the long term and can burn up.
     
  3. Mrwalleyeman

    Mrwalleyeman New Member

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    Thanks Gary S for the reply.
    I will dig into it more tomorrow and report back.
     
  4. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Check for power at the wire to the blower.

    If you have power there, it's a bad fan motor.
     
  5. mallard

    mallard Veteran Member

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    Quite likely the heater motor is shot, IMHO.
     
  6. budro6968

    budro6968 Veteran Member

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    When you see someone driving their 2nd gen Camaro with the window cracked open in the rain. You know their Blower is toast They are so much fun to replace.
     
  7. Jim Streib

    Jim Streib https://www.flickr.com/photos/121766713@N04/albums

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    On cars with AC, the blower motor is mounted to a plastic non-conductive housing and thus requires the blower motor to have a ground wire off of it or one of it's attaching bolts. You can have all the power in the world going to a perfectly fine blower motor but if it's not grounded it will not work.

    It could be a ground connection and not even a power delivery issue.

    The cars that have the metal engine side heater covers that the blower mounted to normally did not have a dedicated ground as the motor self grounded to the metal housing and then the metal housing grounded to the firewall.

    Jim
     
  8. Zspoiler

    Zspoiler Veteran Member

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    You should trace your wiring for any issues .You can run a bypass and see if the motor itself is defective as well.
     
  9. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Good Point, Jim!

    Getting to those ground connections requires you to remove the front passenger wheel and most of the bolts for the inner fender well so you can lower it to gain access to the blower motor behind it.

    If you need to replace the blower motor.... you've got the hard part done.

    Note: A/C and non-A/C cars have a squirrel cage on the motor which is the same diameter but different in depth.
     
  10. Mrwalleyeman

    Mrwalleyeman New Member

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    Thanks everyone for the info. Looks like my son and I are going to be working on it this weekend.
     

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