Leaking ac in cab 1997 Peterbilt 379

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Dairy Hauler, Jun 25, 2025.

  1. Jun 25, 2025 #1
    Dairy Hauler

    Dairy Hauler Bobtail Member

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    Jun 25, 2025
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    I have a 97 Peterbilt 379 and water is leaking inside my cab from the AC. The drain tube is clear and ac works good. Can anyone point me in the right direction of how I can fix it?
     
    Dairy Hauler, Jun 25, 2025
    Dairy Hauler, Jun 25, 2025
    #1
    blairandgretchen Thanks this.
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  3. Jun 25, 2025 #2
    LongHaulTrailer

    LongHaulTrailer Bobtail Member

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    Jul 4, 2024
    Saraland, Alabama
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    Did you open the box that houses the evap coil? There could be a crack and water likes to take the path of least resistance. There could also be something blocking/partially blocking the drain.
     
    LongHaulTrailer, Jun 25, 2025
    LongHaulTrailer, Jun 25, 2025
    #2
    Bean Jr. Thanks this.
  4. Jun 26, 2025 #3
    Iamoverit

    Iamoverit Road Train Member

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    Oct 31, 2023
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    Triple check the drain tube. It sounds like it's still clogged.
     
    Iamoverit, Jun 26, 2025
    Iamoverit, Jun 26, 2025
    #3
    Bean Jr. and Concorde Thank this.
  5. Jun 26, 2025 #4
    blairandgretchen

    blairandgretchen Road Train Member

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    Dec 9, 2011
    South west Missouri
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    Had to reseal my plastic box - drain was clear, I have ‘95.

    They’re a problem.
     
    blairandgretchen, Jun 26, 2025
    blairandgretchen, Jun 26, 2025
    #4
    Iamoverit Thanks this.
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