Air Compressor cycles between 110 and 120 psi while cold

Discussion in 'Volvo Forum' started by dorlia2, Nov 21, 2016.

  1. dorlia2

    dorlia2 Light Load Member

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    Apr 20, 2012
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    The problem is getting worse. Now it happens almost very time I start driving after a stop. It gets back to normal after about 20 miles/minutes or a power cycle while driving


    06 D12 Ultrashift DM2
     
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  3. simon999

    simon999 Light Load Member

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    Feb 6, 2014
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    When I had volvo was same problem. I changed governor , dryer valve but it didnt help. So had to remove air compressor head. It was sticking unloader valve was full of carbon and gum. Had to clean it and replace orings.
    You can fix the head or replace the whole compressor.
     
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  4. dorlia2

    dorlia2 Light Load Member

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    Apr 20, 2012
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    Fixed it. Internal air leak in fan clutch
     
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