Posted by racered57 on July 24, 2020 at 11:01:03 from (47.182.20.228):
In Reply to: Tractor AC compressor posted by Texasmark1 on July 22, 2020 at 15:54:53:
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I am with you on replacing orings, air flow, vacuum, and charge. That said the total charge amount may not be guaranteed by the 80% calculation. Witness the 1989 k1500 chev at my the shop this moment. I have just finished rebuilding both drive axles and the a/c. The a/c was retrofit with new comp and accum a year or so ago by who knows, not me. The truck came in with leaking condenser. I installed a new condenser, new evaporator,orifice tube,o-rings,pag oil(w/ice) replaced the recirc actuator, cleaned the hvac housing and air distribution duct, installed new foam seals for air distribution. While pulling vacuum I checked published charge, "2.8 lbs"(r12). When charging, the low side reached "hard cold" @1.75 lbs.charge amount. I added an additional 2oz. and test drove the truck,,,coldest retrofit job I've ever done. The high and low side numbers were correct relative to ambient and RPM/airflow. The fan clutch moved air correctly. The cab was more air tight than most old trucks, the ambient temp was 100+ and it was frigid inside. I wish my junk made such cold air.
For me the 80% calc is not scripture, super heat and feel have worked consistantly for me since retrofit began maybe 20 years ago.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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