Air Compressor Discharge Line

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by MooneyBravo, Nov 19, 2022.

  1. MooneyBravo

    MooneyBravo Heavy Load Member

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    I have a Volvo D13. I don't own it. I just drive it. Does anyone by any chance have a picture of where the discharge line is connected to the compressor? Or maybe an idea of how I can spot it?

    • For many years I've been pouring air line anti freeze into the glad hand between the tractor and the trailer but the alcohol seems to mess the grommets up. I was recently told that the ideal place is to take the line off the compressor and dump 1/2 cup in there. Is this true? And if so can you give me an idea of where this line is at?

    I'm told that the best place to put your airline antifreeze is in the line that's going from the compressor to the air tank.
     
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  3. beastr123

    beastr123 Road Train Member

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    Do not pour alcohol in to your air system before the air dryer. You can destroy the desiccant filter in the dryer. The best place to pour alcohol into you system is into the primary tank if you do not install an evaporator. you can follow the large line from the dryer to the tank and pour it into that line. It is best to put in a cup (8oz) once then a half cup (4oz) once a month for any month where you will run in freezing weather areas. You do want to drain the tanks before opening the system and may need to only drain the system before adding the alcohol.
    An evaporator in that same line is still the best way to put alcohol vapor into your system as long as you keep alcohol in it.
     
    Last edited: Nov 19, 2022
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  4. Animosus

    Animosus Heavy Load Member

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    Volvo air compressor is mounted to the rear structure. So it's not as easy as pouring it in the discharge line like on an older motor where it is right up front. You basically have to be on top of the transmission to get to the connection off the hard line.
     
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  5. AModelCat

    AModelCat Road Train Member

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    As @beastr123 said, do not pour it into the system ahead of the dryer, it will wreck it. Pour it in after the dryer.
     
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  6. MooneyBravo

    MooneyBravo Heavy Load Member

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    Man..... thankyou so much for all of that! I'm glad that I asked before turning a wrench. Makes a lot of sense, for sure.
     
  7. MooneyBravo

    MooneyBravo Heavy Load Member

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    Thanks. It sounds like from another member that I don't want to pour it in there anyway. Looks like I'll be pouring it in between the air dryer and the air tank on the tractor.
     
  8. MooneyBravo

    MooneyBravo Heavy Load Member

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    Roger that. Thankyou
     
  9. amoren75

    amoren75 Bobtail Member

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    It’s on driver side near firewall
     
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  10. MooneyBravo

    MooneyBravo Heavy Load Member

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    I recently learned that I should put it past the air dryer between the air dryer and the air tank on the tractor. But thanks anyway.
     
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