A/C help please

Discussion in 'Peterbilt Forum' started by Kozakvod, Jun 28, 2019.

  1. Kozakvod

    Kozakvod Medium Load Member

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    Anyone with a clever thought would be appreciated.

    Truck: 2014 Pete 388 ISX15

    Symptom: Running down the road, a/c is fine, then out of the blue for no reason the air flow decreases and it gets less cool and also occasionally has an odd odor.

    What I have done: changed expansion valve and accumulator. That didn’t really do anything change much. Then I changed the Hi and Low pressure switches, that did help a bit, but still same problem as before only less often.

    Any thoughts?
     
    D.Tibbitt Thanks this.
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  3. GypsyWanderlust

    GypsyWanderlust Medium Load Member

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    Clean up the filters. There should be one for the cab and one for the bunk. If you are careful you can probably wash them out with soap and water and reuse them.

    I cleaned mine up and there was a noticeable difference in airflow and cooling.

    Drive safely!
     
    Rideandrepair, Kozakvod and D.Tibbitt Thank this.
  4. razor1983

    razor1983 Medium Load Member

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    Is it freezing up? Does this happen on idle, if so check to see if it’s freezing up
     
  5. Kozakvod

    Kozakvod Medium Load Member

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    Oh yeah, I forgot about that. It does freeze up while moving but as soon as we stop to idle everything will thaw out and it runs cold. But like I said, I changed out the hi low switches and that did help but not fully corrected the problem.
     
  6. Kozakvod

    Kozakvod Medium Load Member

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    Mine have the reusable filters so yes I will make sure they’re clean. But the occasional odor is a strange one.
     
  7. RocketScott

    RocketScott Medium Load Member

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    Apr 10, 2013
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    Is it a burning smell?

    Maybe the blower motor or resistor are on the way out
     
  8. Kozakvod

    Kozakvod Medium Load Member

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    No not really a burning odor. I would say it’s more of a chemical like smell. I keep wondering if it may be freon but i have the level checked often and it’s always full.
     
  9. Hulld

    Hulld Road Train Member

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    The freezing up is the problem.
    When it starts to freeze up the evaporator produces that funny strange odor.
    Freeze up usually only occurs if either the system is a little low on Freon or the sensor that goes in the air box that reads the evaporator temperature is not functioning correctly.
     
    Kozakvod Thanks this.
  10. Kozakvod

    Kozakvod Medium Load Member

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    Well i know it’s not low on freon.

    That sensor, that not the pressure switches right? Is that sensor you speak of where is it?
     
    Hulld Thanks this.
  11. Hulld

    Hulld Road Train Member

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    Forgot to explain if the sensor in the air box goes bad it can make the compressor run full on till it freezes up the evaporator.
    When the evaporator reaches a determined temperature the sensor is supposed to shut the compressor off preventing freeze up and that funky smell.
     
    Rideandrepair Thanks this.
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