VNL780 sleeper berth HVAC unit removal

Discussion in 'Volvo Forum' started by loudtom, Apr 5, 2017.

  1. loudtom

    loudtom Road Train Member

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    Is it possible to isolate the functions to the front A/C unit so that I can remove the one from the bunk? The heater has a leak in the bunk unit, so it smells like coolant when I turn it on. If I could remove it, it would free up a good amount of storage space under the seat. I have a bunk heater, so I would still have a heater available back there. We don't plan on running outside of the northwest, so we should be able to get by with open windows while parked and the front AC while driving.

    One solution would be to reroute the coolant lines for the heater back to themselves, so we can still use the A/C back there. I'd much rather have the space back there, because we aren't going to be idling very much while parked. I also don't feel like spending money fixing something we aren't going to use. It's something I would only fix if we were going to sell the truck.
     
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  3. keebler13579

    keebler13579 Road Train Member

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    You would probably need to get front a/c lines either made or check to see if lines from a day cab would work. You would also have to use gauges and trial and error on refrigerant fill to get it to cool right since you can't fill to factory spec and make sure future shops know that. May run into some a/c cooling issues trying to cool whole truck without rear a/c helping
     
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  4. nasriza

    nasriza Road Train Member

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    need to replace heater core a whole probable about 100 bucks to fix it properly. need to get a/c lines from daycab or find plugs for sleeper lines then coolant lines just bypass them with a hose and they will be ok other than that you should be good to go also need to adjust a/c charge to only 3.3 lbs
     
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  5. CoyoteExpress

    CoyoteExpress Medium Load Member

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    90% of the time the o-rings in the bunkunit goes bad ....
    LIft the bed passangerside
    THere is a cap o top of the unit maybe 1 or 2 screws
    YOu will see the 2 pipes pressed in / mounted to the unit
    BY a alu part with one bolt in the middle
    OPen the system there and replace the o-rings ...
    YOu will see cooland i the holes arround best sign thatvthr o-rings are gone
     
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  6. boneebone

    boneebone Road Train Member

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    If you remove the rear HVAC Unit because you don't want to spend the money to fix a leak, you definitely won't have rear A/C.

    Most of the Heater leaks in the rear HVAC are attributed to bad o-rings in the connections to the Heater Control Valve which can be fixed yourself with a few 25¢ replacement o-rings and about a hour of your time.
     
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  7. CoyoteExpress

    CoyoteExpress Medium Load Member

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    LOl i got a parrott
     
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  8. boneebone

    boneebone Road Train Member

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    Actually I was in the middle of responding before I had to do something else and I didn't realize you answered with a similar response when I got back to finish answering.

    But you are right with your solution.
     
  9. CoyoteExpress

    CoyoteExpress Medium Load Member

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    JUst kiddingband lol a bit ;-)
     
  10. boneebone

    boneebone Road Train Member

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    I knew you were.
     
  11. loudtom

    loudtom Road Train Member

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    Thanks everyone. I was kind of under the impression that it would be an expensive fix for something we hardly plan on using. I'd much rather have the extra space by removing it and using an APU for cooling the bunk. I'll keep weighing my options and researching.
     
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