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if a truck loses power steering and air at the same time...

Discussion in 'Questions From New Drivers' started by KristinTeam, Apr 19, 2017.

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  1. Apr 19, 2017 #1
    KristinTeam

    KristinTeam Bobtail Member

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    what would be the most likely cause of this scenario?

    additional symptoms prior to complete loss of power steering and air loss: squealing at high idle (over 15k rpm) and extremely slow air pressure build up. A/C blowing hot air.

    is this a pump gone bad or air compressor gone bad?
     
    KristinTeam, Apr 19, 2017
    KristinTeam, Apr 19, 2017
    #1
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  3. Apr 19, 2017 #2
    Roberts450

    Roberts450 Road Train Member

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    What engine?
     
    Roberts450, Apr 19, 2017
    Roberts450, Apr 19, 2017
    #2
  4. Apr 19, 2017 #3
    KristinTeam

    KristinTeam Bobtail Member

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    mercedes
     
    KristinTeam, Apr 19, 2017
    KristinTeam, Apr 19, 2017
    #3
  5. Apr 19, 2017 #4
    Roberts450

    Roberts450 Road Train Member

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    Not sure on that engine but it sounds like a belt is slipping if its squealing.
     
    Roberts450, Apr 19, 2017
    Roberts450, Apr 19, 2017
    #4
    ncmickey Thanks this.
  7. Apr 19, 2017 #5
    ZVar

    ZVar Road Train Member

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    That's what I was thinking. Idler pulley is trying to freeze up, or even another pulley (ac clutch) is freezing.
     
    ZVar, Apr 19, 2017
    ZVar, Apr 19, 2017
    #5
  8. Apr 20, 2017 #6
    AModelCat

    AModelCat Road Train Member

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    If you're running at 15,000 RPM I think you've got more to worry about than no power steering.....


    All kidding aside, I'm not at all familliar with Mercedes but I have not seen a belt driven air compressor before. Could it possibly be a broken accessory drive if it also supplies power to a pulley to drive the A/C compressor?
     
    AModelCat, Apr 20, 2017
    AModelCat, Apr 20, 2017
    #6
    OLDSKOOLERnWV, SingingWolf and ChaoSS Thank this.
  9. Apr 20, 2017 #7
    Cornbinder_King

    Cornbinder_King Light Load Member

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    Is you power steering air by chance?
    Based on what you are describing, I would say belt is stretched beyond its service life. Or your idler pulley spring is weak.
     
    Cornbinder_King, Apr 20, 2017
    Cornbinder_King, Apr 20, 2017
    #7
  10. Apr 20, 2017 #8
    Ridgeline

    Ridgeline Road Train Member

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    What truck?
     
    Ridgeline, Apr 20, 2017
    Ridgeline, Apr 20, 2017
    #8
  11. Apr 20, 2017 #9
    KristinTeam

    KristinTeam Bobtail Member

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    western star
     
    KristinTeam, Apr 20, 2017
    KristinTeam, Apr 20, 2017
    #9
  12. Apr 20, 2017 #10
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    I driven a lot of miles with a Mercedez and the air compressor is not belt driven. The A/C is like any other truck, so if the compressor freezes up and the compressor clutch is engaged it would squeal unil the belt burned up.
     
    kemosabi49, Apr 20, 2017
    kemosabi49, Apr 20, 2017
    #10
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