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1990 Honda Accord EX A/C troubleshooting

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    #1

    1990 Honda Accord EX A/C troubleshooting

    Hello community
    On my 1990 accord EX the A/C is completely dead , no blower fan working , No condenser fan working , compressor clutch not engaging , BUT it is fully charged with Freon and converted to 134A
    I appreciate any help including finding sites that help trouble shooting and electrical wiring diagrams
    thanks in Advance
    Tags: a/c compressor, a/c controls, a/c troubleshooting
    #2
    Your compressor is probably locked up because of the R-134a in your system. R-134a with PAG is not compatible with the mineral oil in an R-12 system. You very well could have "black death" and have to change out your compressor. You'll also have to clean out the other lines in the system as well if this is the case.
    My Members' Ride Thread - It's a marathon build, not a sprint. But keep me honest on the update frequency!

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      #3
      Answer these questions please:

      1. Who did the R134a conversion for you? What exactly was done during the conversion?

      2. How is it "fully charged" when the compressor won't spin? Did you "charge" it? What tools were used to charge it?

      3. Have you checked your fuses? Are there lights on the instrument panel and do they work?

      4. Have you ever worked on A/C before?

      Comment

        #4
        Originally posted by Jarrett View Post
        Your compressor is probably locked up because of the R-134a in your system. R-134a with PAG is not compatible with the mineral oil in an R-12 system. You very well could have "black death" and have to change out your compressor. You'll also have to clean out the other lines in the system as well if this is the case.
        I've done many conversions and never had this problem

        Comment

          #5
          Originally posted by Tippey764 View Post
          I've done many conversions and never had this problem
          Please read about R134a mineral oil miscibility. R134a is a Tetrafluoroethane and its fluorene molecules are not compatible with the other hydrocarbon structures in mineral oils. This means PAG ester and polyol ester molecules are more compatible with the fluorene molecules. Mineral oil will lead to black death as Jarrett as discussed, R134a does not dissolve mineral oil, it does PAG.
          Last edited by wildBill83; 08-10-2013, 08:55 PM.

          Comment

            #6
            I used Ester oil for my A/C R-134a conversion on two of cars I have.
            Flush the system, changed the expansion valve, changed dryer and changed compressor, too.
            No issues.
            Last edited by oyajicool; 08-11-2013, 06:34 PM.
            A&P-IA

            Comment

              #7
              Are you blowing the a/c fuse?
              If so disconnect the a/c fan and a/c compressor and turn car on and turn a/c on and then go check fuse to see if it blew it out. If its not blown plug either the fan or the compressor in but only one. Let's say you plugged the fan back. Then you turn the car back on and turn the a/c on again. The fan should spin. If the fan doesn't spin go check the fuse and most likely be blown do to a short. Then you know you have a short in the fan and it needs to be replaced. To check the compressor you do the same but with the fan disconnected but you jump the pressure switch to make the system think its full because if the pressure switch is bad it will not engage the clutch.

              Is a/c clutch engaging?
              With the car off try and spin the clutch with your hand. Make sure it spins pretty easy with a little drag.
              http://www.cb7tuner.com/vbb/showthread.php?t=171625

              Comment

                #8
                The first issue he needs to visit is the blower fan not working. No reason to even bother with the freon or anything until it atleast blows hot air. But I imagine this guy is a spam bot by the way he is typing. But ya TIPPEY I have never had the so called black death either. And I have mixed r134 and r12 atleast 100 times.

                Comment

                  #9
                  Originally posted by andrew22888 View Post
                  The first issue he needs to visit is the blower fan not working. No reason to even bother with the freon or anything until it atleast blows hot air. But I imagine this guy is a spam bot by the way he is typing. But ya TIPPEY I have never had the so called black death either. And I have mixed r134 and r12 atleast 100 times.
                  You only get the black death if you mix the oils, if you just add R134a to a mineral oil system then you just end up with improper lubrication resulting in premature compressor o-ring failure. The pistons in the compressor rely on oil to keep the o-rings lubricated, if the R134a does not blend with the mineral oil (it is physically impossible by the way for that to happen) then the freon cannot circulate the lubricant through your system.

                  Comment

                    #10
                    I'm with Andrew on this one. Spam
                    And Nobody's ac will blow cold if the blower motor is no good. I bet he would freeze in the winter too


                    Steve

                    Comment

                      #11
                      Ya def spam or he just doesn't want help. But we have been having alot of spam latelly. Charging the ac before fixing the blower motor, Is like having sex with your pants still on. Trust me there is no reason for it

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