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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