you should have a 55 to 60 degree temp at the outlet firthest from the evaporator core. with a 134a conversion from the old r12, you need to replace the compressor oil with esther oil. also, what ever the r12 capacity of the system was, you use about 80 % of the 134a. evac the system and pull a vaccuum on it for about 45 minutes to an hour to remove any moisture from the system. hold the vacuum on the system for at least half an hour and look for a vaccuum drop. if so there is a leak. there is a u/v dye kit, napa has em along with a small u/v light and a pair of yellow glasses. charge the system with 134 and add the dye. run the system for about an hour or so , the shut it off and use the glasses an the u/v light to locate the leak. check all hoses, fitting, compressor seals and a/c condenser.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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