If it is really important that this AC works well and works well for a long time, here is my advice:
Take the tractor to someone who specializes in fixing old Sound-Gard cab air conditioners and pay him what he asks. Don't be surprised if you have to drive for a county or two to find the guy. There is more idiocy, fraud, and outright ignorance in the mobile AC field than you can imagine. What works OK in Minnesota or Iowa will last an afternoon where it really gets hot.
You will never, ever become proficient in these repairs by hearsay or message board postings. The information you posted tends to indicate there is too much heat entering the system. The problem is probably compounded by poor condenser efficiency. I also suspect the tests you are running are no where close to the procedure described in the technical manual.
The replacement R134A expansion valve is calibrated a little different than the original R12 valve. But right now, that is the least of your problems.
You can make this AC as reliable as it was when it was it was new. But it is gonna take some $$$ in parts and labor. We don't want to sound like we are beating you over the head. It's just that a lot of us have spent way too much of our lives re-doing these things after they have already been "fixed".
This post was edited by rexhellwig at 04:17:27 04/28/11.
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