Air not blowing in cabin, working fine in the bunk??

Discussion in 'Volvo Forum' started by Carter8107, Jun 14, 2020.

  1. Carter8107

    Carter8107 Bobtail Member

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    Jun 14, 2020
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    Noticed today that the air conditioner in the cab seemed to be changing speeds on it’s on, within a few hours it had stopped blowing all together. The air in the bunk is working as it should. After reading a few of the threads here I checked for a motor noise in the dash. I turned the control to low and the gradually up and the only thing I hear is a very faint high pitched noise. Does anyone have any ideas? Any info would be greatly appreciated. 2018 Volvo 780 D13 UPDATE: The bunk air has stopped blowing as well
     
    Last edited: Jun 14, 2020
    Reason for edit: Update
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  3. "semi" retired

    "semi" retired Road Train Member

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    Sucked a bird in the air intake?:dontknow:
     
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  4. truckdriver31

    truckdriver31 Road Train Member

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    check to see if it has a cabin filter
     
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  5. Carter8107

    Carter8107 Bobtail Member

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    Jun 14, 2020
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    It has both cab and bunk filters. The cab was clean and the bunk was disgusting. Cleaned it out, limping it along TIL end of trip. It started working again then quit and now it’s doing whatever it pleases. Comes on and off randomly. It’s cold this morning in Oregon so I turned it to heat. So now I know the heat doesn’t work either. Solid cold air when it decides to blow
     
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  6. Rob100100

    Rob100100 Light Load Member

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    On the cab blower motor most likely died. You can get new one from a volvo dealership and do it yourself. Or have a dealership or your own mechanic do it. Pretty simple, just time consuming. Some videos on youtube on how to do them. On the bunk most likely the same, weird for both of them to go at the same time. Crap happens.
     
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  7. 86scotty

    86scotty Road Train Member

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    I'm betting the dash control died. Too many weird symptoms for blower fan only. I was thinking that with the 'no noise but high pitched whine' but too much else going on.

    I've been told they fail often but my 2015 is still hanging on at 800k.
     
  8. Burdisco

    Burdisco Light Load Member

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    Apr 25, 2015
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    So my heater controller was acting up. The fan would cut in and out. Playing with the speed control it would come on and would work for a while. A new one is $440 Cdn but ... had the incorrect controller for my truck. Mine has the degrees rather then blue to red. What I did was take it apart and use the front cover from incorrect controller and the printed circuit board of correct controller and combined the two. It works. No more issues. Jumped for joy. Both boards are the same except the degree controller has a extra contact. The chip that runs the controller has the same serial number. The circuit board is same except for the extra contact. Hope this helps someone.
     
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