r3v SChool me on AC

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  • xxx-Lost-Soul-xxx
    E30 Mastermind
    • Apr 2008
    • 1953
    #1

    r3v SChool me on AC

    I dont know shit about AC.

    My compressor is leaking and After 25 years i think it did a damn good job.
    Anyway ive decided i am gonna replace the thing with a OEM behr again.

    I just bought a new Dryer,but was wondering what else should i replace while it has no freon in it?

    Tags: None
    • Farbin Kaiber
      Lil' Puppet
      • Jul 2007
      • 29502
      #2
      Didn't they go over this in the Automotive Classes you took when you became a wrench?

      Evaporator, condenser, orifice tube, expansion valve, compressor, and receiver dryer. You can leave the evaporator, the condenser and the lines, but at minimum, the other stuff should be replaced, and proper seals/ports for r134a will also be required, along with the proper amount of compressor oil.

        Comment

        • xxx-Lost-Soul-xxx
          E30 Mastermind
          • Apr 2008
          • 1953
          #3
          ^yeah But that was over 6 years ago.
          I have never had the chance to do anything Ac related.

          I ended up getting a GM R12 To r134a conversion port. $1.67 and i charged it at work.
          well It worked, so now i have cold AC.

            Comment

            • ncsubowen
              E30 Enthusiast
              • Nov 2013
              • 1012
              #4
              Correct me if I'm wrong, but don't the two have different molecule sizes? I was under the impression that they weren't compatible coolants and would require at a minimum new seals/ports?
              sigpic

              4 doors.. so much room for activities!

              IG @bluebombr

              Transaction Feedback:

              http://www.r3vlimited.com/board/showthread.php?t=323622

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                • gkurey
                  Banned
                  • Mar 2010
                  • 882
                  #5
                  R134 may leak out due to molecule size (R134 is smaller) but if it works....why not run it til you need to change something, lol.

                    Comment

                    • slammin.e28
                      שמע ישראל
                      • May 2010
                      • 12054
                      #6
                      Usually you can get away with just switching the ports. Like gkurey said, run it until it leaks out. Once it becomes a big enough leak, then deal with the o-rings, etc.
                      1974.5 Jensen Healey : 2003 330i/5

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                        • UserError
                          Member
                          • Mar 2011
                          • 86
                          #7
                          Typically, due to the mineral oil used in R12 systems, that coats the old lines and o-rings, conversion isn't necessary, though any part changed out should use barrier hoses, since new R12 style hoses will leak R134a like a sieve.

                            Comment

                            • xxx-Lost-Soul-xxx
                              E30 Mastermind
                              • Apr 2008
                              • 1953
                              #8
                              So today all my cold air is gone,its back to normal and there is dye all over the ports,

                              I also noted that my Compressor was making a lot of noise today. Its also pissing oil as long as ive owned the car.

                              Anyone know if this will fit my car?
                              Page not found – My Blog
                              http://www.acpartshouse.com/inventory/100931-1978-1993-bmw-ac-compressor

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