Coolant hose at the engine air compressor

Discussion in 'Freightliner Forum' started by robertom224, Aug 25, 2016.

  1. robertom224

    robertom224 Bobtail Member

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    Aug 25, 2016
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    Recently the hose by the engine air compressor star to leak, any idea what is the issue..... Thanks
     
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  3. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Hesperia, Ca.
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    Mine started to leak on a 3406E. Had to call road device. I told them to bring to both hoses. They did a R/R and I was back on the road. Beats frying the motor. 4 hours labor plus the parts.
     
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  4. Transtar4070B

    Transtar4070B Bobtail Member

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    Oct 13, 2011
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    If you;re running a Cascadia with a DD13/15 the Air Compressor uses plastic cooling lines. Over time they get hard and crack/leak. Better get fixed before it actually blows out and you dump your coolant.
     
  5. SLCTrucker

    SLCTrucker Medium Load Member

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    Jan 15, 2009
    Salt Lake City UT
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    Yep 2 coolant lines, they just clip onto the fittings back there, they are cheap to buy but a pain to replace, just do them both at once.
     
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  6. 1fixitman

    1fixitman Light Load Member

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    Aug 16, 2016
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    Year make model truck what engine?
     
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  7. mhyn

    mhyn Road Train Member

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    Northridge, CA
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    some people don't put original lines back. they change fittings and install silicone hoses.
     
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  8. shatteredsquare

    shatteredsquare Road Train Member

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    middle dirt
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    That would explain a bad leak on a cold day that randomly stops on its own when it warms up. Couldn't tell where it was coming from when everything is wet but now that it's dry there's pink icing all over the compressor head, concentrated around two small hoses right next to each other. They both look like metal fittings though, it's rubber hose into a metal sleeve and a metal nut.
     
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  9. wolfo68

    wolfo68 Bobtail Member

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    Apr 25, 2020
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    there are two larger hoses one the outside, those are the problem pieces. One from the block that is basically a 90 degree piece, and a common failure. The second runs up to a T fitting above the air lines. Crawl underneath and take off the power steering pump for an easier time to replace them.
     
  10. GR8SONG

    GR8SONG Bobtail Member

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    Aug 13, 2023
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    I have a 2012 M2 with DD13 and Allison 3000. It has the same coolant leak at around air compressor and fuel filter housing area. For my other M2 with DD13, there's this long plastic black coolant line running from water pump to the air compressor. (When you change it, always ask for an updated one wherever available. Even a rubber one is better than plastic one. A metal one is the best.) But on this truck, there is only one short one running from the bottom of fuel filter housing to the air compressor. Replaced it, and coolant still leaks in that area. Will replace the freeze plug at the back of air compressor and see.
     
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