Ac problems prostar

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Xenergiserx, Jun 22, 2021.

  1. Xenergiserx

    Xenergiserx Bobtail Member

    41
    18
    Feb 2, 2021
    0
    Hello guys it’s me again with More problems.
    Yay!! Now it my ac. Well the problem is that it blow cold air but then cut off and blow regular air.
    When it got really hot I checked the expansion valve and it was frozen. So I figured it needed refrigerant. Well I got a gauge and measured 9 on the low side and the high side was just goin from 90 to 350 non stop. When it hit 350 the engine fan turns on. And cooled the system down.
    It was 104 degrees outside down here in Texas.
    Today in the morning it was 65. And checked it again now is 40 on the low side and the high just keeps going up and down.

    I’m thinking of flushing the system and refill maybe too much oil? I wanted to check with you guys before i start to buy new parts. Thanks
    prostar 2015
    Cummins isx15
    500k miles
     
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  3. baha

    baha Road Train Member

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    Jul 25, 2013
    ga
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    +You need to get a diff. set of gages put on it just to ck. the low press. readings are right, the fan is working right so that's good, when it starts to blow hot air open to see if a/c comp. is still turning, if it is then its frezz. up and you need to find the temp. control sen. is bad and not turning off the a/c comp. so it can/not ice up?
     
    Xenergiserx Thanks this.
  4. reeferwrencher

    reeferwrencher Medium Load Member

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    703
    Aug 4, 2018
    0
    When you worked on it last time did you evacuate the system of air before you charged it up
     
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