Need help with AC issues

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Brettj3876, May 30, 2020.

  1. Brettj3876

    Brettj3876 Road Train Member

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    1993 mack ch

    New receiver/drier & condenser. blew out the lines looking for a blockage. They were clear but im thinking every now and then a piece, o ring maybe will block it up from time to time not all the time. Before we blew the lines out we couldn't get it to take a charge (local AC guy did that) now after getting it to take some it's intermittent working and not the coolest. Condenser fins are fine and cac is 2 yrs old fin are good not blocked.

    What would be next step? Evap core? Before this it would freeze you out on low

    @AModelCat i was reading a post somewhere you seem knowledgeable on ac. Kinda stumped here and so was the AC guy we took it to last fall. The little bit i do know is you'll get false readings on both sides, if something internal is f'd, don't remember the part they were referring to
     
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  3. boneebone

    boneebone Road Train Member

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    You should’ve changed the expansion valve/orifice tube too, they tend to get clogged and will affect temperatures.
     
    Rideandrepair Thanks this.
  4. Rideandrepair

    Rideandrepair Road Train Member

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    I’d suspect expansion valve malfunctioning. I replaced both of mine. Old ones looked brand new inside. I flushed my evaporators, but couldn’t get them flushed well, no matter how much I flushed them. Not a closed loop. Rail/ fin design.I replaced everything but the evaporators. Wish I would have just replaced them too.
     
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