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HVAC issue on Volvo 780

Discussion in 'Volvo Forum' started by RogueX, Jun 26, 2014.

  1. Jun 26, 2014 #1
    RogueX

    RogueX Light Load Member

    110
    22
    Oct 12, 2011
    Indianapolis, IN
    0
    2007 780, D12 889,xxx miles.

    My hvac fan speed is erratic. I am pretty darn sure it is not the fan motor because moving the knob back and forth from level to level sometimes gets it to blast, sometimes gets it to go lower that the position it is set at. What does work is a swift smack to the control unit itself, or the dash just above! :biggrin_25523: I was just wondering if this is a common problem, and if so is it a short or something in the dash, or is the control unit going to fail on me soon?

    I know, I know... it could be a bunch of different problems, but I was just wondering if anyone else had encountered this problem with their Volvo and what the fix was.

    Thank you.
     
    RogueX, Jun 26, 2014
    RogueX, Jun 26, 2014
    #1
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  3. Jun 27, 2014 #2
    SpiritWolf

    SpiritWolf Light Load Member

    192
    118
    Jul 10, 2012
    North Highlands CA
    0
    My 09 780 did exactly the same thing for about 2 weeks, before the fan motor up and died. $665 to replace. ;-/
     
    SpiritWolf, Jun 27, 2014
    SpiritWolf, Jun 27, 2014
    #2
    RogueX Thanks this.
  4. Jun 27, 2014 #3
    BobcatVolvo

    BobcatVolvo Light Load Member

    171
    132
    Feb 23, 2014
    Western Ohio
    0
    Yeah, that might be the dying moments of your fan motor, and yes, they are pricy. However, you may luck out and it be either something loose under the dash, or the knob could be going bad. I had a kind of similar experience a year or so ago, and before I took anything apart, I pulled the knob off and shot some computer cleaner canned air into it and that fixed it.
     
    BobcatVolvo, Jun 27, 2014
    BobcatVolvo, Jun 27, 2014
    #3
    RogueX Thanks this.
  5. Jun 27, 2014 #4
    RogueX

    RogueX Light Load Member

    110
    22
    Oct 12, 2011
    Indianapolis, IN
    0
    Was that just for the part, or parts and labor?
     
    RogueX, Jun 27, 2014
    RogueX, Jun 27, 2014
    #4
  7. Jun 27, 2014 #5
    RogueX

    RogueX Light Load Member

    110
    22
    Oct 12, 2011
    Indianapolis, IN
    0
    I'm pretty sure it's the knob, I hope you are right. I'm just going to take the control unit out and clean up all the connections and everything.
     
    RogueX, Jun 27, 2014
    RogueX, Jun 27, 2014
    #5
  8. Jun 27, 2014 #6
    Johny41

    Johny41 Road Train Member

    1,192
    1,017
    Feb 10, 2011
    Ontario, Canada
    0
    Johny41, Jun 27, 2014
    Johny41, Jun 27, 2014
    #6
    RogueX Thanks this.
  9. Jun 27, 2014 #7
    SpiritWolf

    SpiritWolf Light Load Member

    192
    118
    Jul 10, 2012
    North Highlands CA
    0
    That was Total for parts and labor at Mountain west volvo in salt lake city UT.
     
    SpiritWolf, Jun 27, 2014
    SpiritWolf, Jun 27, 2014
    #7
    RogueX Thanks this.
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