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Fan/ac question for Volvo 670, 2012

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Towman Bill, Aug 12, 2017.

  1. Aug 12, 2017 #1
    Towman Bill

    Towman Bill Bobtail Member

    9
    0
    Aug 10, 2017
    Toledo, Oh
    0
    Hi all, new to the forum but have been reading it for awhile now.
    I am having trouble with my fan it keeps shutting off making my AC in the front stop working. I can tap the fan motor and get it to run, but it will only stay running for so long...if I turn the fan lower (from the switch) it will shut it down immediately. I just replaced the resister before posting this but that didn't help. Do you think it's the motor?
    I am stuck at a stop for the weekend in the heat, have my dog w/ me and need the AC working properly! Any help is appreciated and thanks in advance.
     
    Towman Bill, Aug 12, 2017
    Towman Bill, Aug 12, 2017
    #1
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  3. Aug 14, 2017 #2
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    It sounds like a bad Fan Control Switch.

    You can test the Blower Motor by bypassing the switch and running 12 volts directly to it and see if it stays on.

    If it stays running, than the On/Off Fan Speed switch is bad.

    My rear A/C was doing the same thing, it would work intermittently depending on the fan speed switch position.

    I replaced rotary fan speed switch and it solved the problem.
     
    Last edited: Aug 14, 2017
    boneebone, Aug 14, 2017
    boneebone, Aug 14, 2017
    #2
    Towman Bill Thanks this.
  4. Aug 14, 2017 #3
    Nash87

    Nash87 Bobtail Member

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    Aug 11, 2017
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    Is there a fuse for the front blower motor. I can't find it
     
    Nash87, Aug 14, 2017
    Nash87, Aug 14, 2017
    #3
  5. Aug 14, 2017 #4
    Nash87

    Nash87 Bobtail Member

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    Aug 11, 2017
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    I have a 2000 vnl64. My front blower motor just stopped working. Is there a fuse for this. Can't find it in the main panel
     
    Nash87, Aug 14, 2017
    Nash87, Aug 14, 2017
    #4
  7. Aug 14, 2017 #5
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    If there's no fuse than it's controlled by a relay or circuit breaker.

    As each truck is spec'd differently, look on the fuse box label to see how your truck is configured.
     
    boneebone, Aug 14, 2017
    boneebone, Aug 14, 2017
    #5
  8. Aug 14, 2017 #6
    Towman Bill

    Towman Bill Bobtail Member

    9
    0
    Aug 10, 2017
    Toledo, Oh
    0
    Ended up replacing resister, it wasn't it, so then replaced the blower motor. Running fine now. Thanks for the responses.
     
    Towman Bill, Aug 14, 2017
    Towman Bill, Aug 14, 2017
    #6
  9. Aug 14, 2017 #7
    Towman Bill

    Towman Bill Bobtail Member

    9
    0
    Aug 10, 2017
    Toledo, Oh
    0
    My fuses are on top of the dash by the top cupholder...the top pops off to access them.
     
    Towman Bill, Aug 14, 2017
    Towman Bill, Aug 14, 2017
    #7
  10. Aug 14, 2017 #8
    Towman Bill

    Towman Bill Bobtail Member

    9
    0
    Aug 10, 2017
    Toledo, Oh
    0
    Mine does have a fuse for blower motor in the area described above, hope this helps.
     
    Towman Bill, Aug 14, 2017
    Towman Bill, Aug 14, 2017
    #8
  11. Aug 16, 2017 #9
    Nash87

    Nash87 Bobtail Member

    17
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    Aug 11, 2017
    0
    My truck has a mind of its own. The blower motor started working shortly after and hasn't missed a beat yet
     
    Nash87, Aug 16, 2017
    Nash87, Aug 16, 2017
    #9
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