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 - Storing Your Tractor - by Staff. If your tractor is going to be stored for any length of time, a few precautionary measures are helpful in preserving various parts, also in avoiding future difficulty. Store tractor under cover. If impossible to place tractor under cover, be sure to cover air stack and exhaust pipe. Drain radiator and engine block. To avoid gum content collections, drain both fuel tanks and carburetor. Leave radiator and fuel caps slightly loose to protect gaskets. Block tractor up to remove weight from tires and to keep tires from contact with moist floor.
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