Problems with my volvo

Discussion in 'Ask An Owner Operator' started by chalstead, Oct 22, 2011.

  1. Oct 22, 2011 #1
    chalstead

    chalstead Bobtail Member

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    Oct 19, 2011
    hollywood,fl
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    I have 2007 volvo vnl780 with 599700 miles. I have this air leak happens while I am driving. Slowly goes down to 100 psi then goes back up to 120 psi and it continues to do that. There is a new air dryer, new fan clutch, new cabin air bags. However I cannot hear any air leaking when I stop. Also when I stop over night and leave the truck off I am down to 60 psi or below. What could be the problem?

    Finally I just started my truck today after being off for a few days and now its making a squealing noise sounds like its coming from the fan area. Note it has been raining for the past 3 days.

    Thanks
     
    chalstead, Oct 22, 2011
    chalstead, Oct 22, 2011
    #1
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  3. Oct 22, 2011 #2
    Mommas_money_maker

    Mommas_money_maker Road Train Member

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    Check under the cab (in the frame rail) for a box with air lines in it. Check it in the morning when cold and building air. I had a slow leaker like this on my 2004 volvo and it wouldnt show until early morning. Other than that, put a bullet in the volvo, I hate them since that truck and will never go back.
     
    Mommas_money_maker, Oct 22, 2011
    Mommas_money_maker, Oct 22, 2011
    #2
    alien4fish Thanks this.
  4. Oct 22, 2011 #3
    rollin coal

    rollin coal Road Train Member

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    Maybe a level valve gone/going bad. It shouldn't bleed air out the exhaust port if the truck is parked sitting still. Let it build up air, shut the engine off, then go listen for an air leak under the fifth wheel.
     
    rollin coal, Oct 22, 2011
    rollin coal, Oct 22, 2011
    #3
    BigBadBill Thanks this.
  5. Oct 23, 2011 #4
    Dryver

    Dryver Road Train Member

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    Get a spray bottle with soapy water and with the pressure built up start soaking all your line connections and valves, it will be easy to spot.
     
    Dryver, Oct 23, 2011
    Dryver, Oct 23, 2011
    #4
    BigBadBill Thanks this.
  7. Oct 23, 2011 #5
    larry2903

    larry2903 Heavy Load Member

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    Oct 18, 2009
    On the trails
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    chalstead, I agree with Mommas money maker. I have an 07 Volvo, had the same issue. I would lose air down to about 60 lbs in 20 min. or so. Found air valve across from transmission in drivers side frame rail that was leaking. Has 4 air lines coming in, 4 air lines coming out other side. Volvo calls this a "safety valve". Replaced it and air is now holding overnight. Mine was leaking all the time, hot or cold.
     
    larry2903, Oct 23, 2011
    larry2903, Oct 23, 2011
    #5
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