I have now repaired the a/c on 2 LX cars, a '91 and a '92. I converted them both to 134a while I was at it. They both started out with working R12 a/c. When converting I had to install an orfic tube on in the high pressure line going into the evaporator to get them to cool. How does the a/c work with out this when running R12? I removed all the lines and found no orfice tube anywhere in either system. They blow cold now but would not work until I did that. Anyone have any ideas. David
I have no idea what you are talking about, but when i converted i simply gave away my remaining r12 and created a vacuum, then put in the proper amount of 134. 2 years later it still blows nice and cold. Never changed any hardware (except the compressor clutch) Dr.
I'm not sure about the '91 and 92 model year stangs, but i do know that in the mid and late 80's cars the orifice tube is located in the liquid line, or the line running from the condensor to the evaporator. It's not removeable. It's part of the line. They do make a kit with compression fittings to cut it from the line and make it removeable though. That's interesting, i wonder why you couldn't get it to cool before? If it cooled with R12 there was obviously an orifice in there.
