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Murray AC Compressor Questions

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  • Murray AC Compressor Questions

    I am installing a Murray AC Compressor in my 2014 Silverado 1500. I have two questions I could use help with.

    1. There is a screw in plug with a sticker on top that covers a tiny hole that goes through the plug. I took it out and verified the hole doesn't go straight thru, it's baffled or something to prevent oil from escaping.

    I can't find any info on what this is for and I have not mistaken the low or high psi lines into the compressor. It almost looks like a breathing hole of some type.

    2. What is the best method of adding new PAG 46 oil after dumping out the factory oil? Do I pour it in the low side port and rotate the clutch several times or a better method?

    Thanks

  • #2
    The "plug" is a pressure relief valve, pour oil in the low pressure port (suction port).

    Comment


    • #3
      Originally posted by Cornbinder89 View Post
      The "plug" is a pressure relief valve, pour oil in the low pressure port (suction port).
      And once installed in the vehicle, turn the compressor drive plate at least 10 revolutions to distribute the oil.

      Comment


      • #4
        jellis56: Late to this party we discussed that plug. YOUR pics showed exactly another, no aguement if't different with a clutch and coil also. That end isn't the leak I as I recall.

        IF you POUR out oil that came with it you can put that exact amount in how you got it out. Low feeds compressors first and by spinning you make sure it's got some for start up.

        This is some hybrid "variable rate" compressor uses 4 pistons pointing to the rear. Those get pushed to compressed for the circumstance, temps increase the pressure it will make or back off to as little as 2psi if so cold out sometime refrigerant could be liquid so it seems to deal with that.

        Murray said at their site they all came with proper fill for their NEW compressor! Dumping it out is/was probably not necessary.

        Why can it leak? That was a long lump in rear of compressor - my guess is if you look inside that plug you'll find a screw or fastener maybe a snap ring that holds it in. When out is must have "O" rings or way to keep oil from spilling out.

        If by chance you add too much oil cooling when all charged up (other items tended to) would be erratic.

        I've had web connection problems for months on end would fail me but watched this thing work like a cut out of it just searching Murray VR compressors. Then the whole concept made perfect sense if time I'll try to find that again and post it here.

        I thought you were close to finishing this up? Sorry if another at other site was a tad too sure that thread was becoming a waste of his time. Forgive him please he's worked and owned his own shop in Tropical Florida such that there is NEVER a month that A/C wouldn't be needed sees different pattern failures than I do or did still too early in NE US to mess with A/C it's too cool but getting there,

        Tom
        Tom
        MetroWest, Boston

        Comment


        • #5
          Sorry jellis56: There were two going on at the same time! The other 2014 used the variable rate one, not this one. Low % of the other sold. Both Murrays!
          The guys are spot on here for this one - no surprise by me either!

          Tom
          Tom
          MetroWest, Boston

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