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AC not cold anymore

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mitmaks, Jul 26, 2025 at 4:37 AM.

  1. Jul 26, 2025 at 4:37 AM #1
    mitmaks

    mitmaks Road Train Member

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    This trip I've had AC not blow as cold as it used to. It would literally be freezing cold in cab and I'd even turn it down from 4to 3rd setting.
    Now on full blast it's barely cool and idk what it could be? Stuck expansion valve?
     
    mitmaks, Jul 26, 2025 at 4:37 AM
    mitmaks, Jul 26, 2025 at 4:37 AM
    #1
    Walk Among Us Thanks this.
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  3. Jul 26, 2025 at 6:51 AM #2
    JB7

    JB7 Heavy Load Member

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    With the truck running and a/c on check to see if the clutch on the front of the a/c compressor is turning. If so, then you likely have a leak and need to connect a set of gauges to read the pressures. If the clutch is not turning then the system is low or out of refrigerant or there is an electrical problem.
     
    JB7, Jul 26, 2025 at 6:51 AM
    JB7, Jul 26, 2025 at 6:51 AM
    #2
  4. Jul 26, 2025 at 9:31 AM #3
    mitmaks

    mitmaks Road Train Member

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    Oh the compressor works fine, clutch engaged and blowing cold but not as cold as it used to
     
    mitmaks, Jul 26, 2025 at 9:31 AM
    mitmaks, Jul 26, 2025 at 9:31 AM
    #3
  5. Jul 26, 2025 at 2:08 PM #4
    reeferwrencher

    reeferwrencher Medium Load Member

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    Just add some freon
     
    reeferwrencher, Jul 26, 2025 at 2:08 PM
    reeferwrencher, Jul 26, 2025 at 2:08 PM
    #4
  7. Jul 26, 2025 at 2:29 PM #5
    bad-luck

    bad-luck Road Train Member

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    Most common cause is low freon.
     
    bad-luck, Jul 26, 2025 at 2:29 PM
    bad-luck, Jul 26, 2025 at 2:29 PM
    #5
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