new compressors come with PAG oil in them. if yours was a conversion, it probably has Ester oil in it. I would flush complete system with DuraFlush, available at NAPA. replce drier accumalator, if orfice tube style control valve replace it, if exspansion valve check it for debri and clean. If you know total system capacity when it ran R12, reduce it by 80% for R134. For oil, use a pag oil , use compressors recommend weight for it. use old R12 system capaicity for oil. split it up, if 8ozs, put 2 ozs in condensor, 2 ozs in evaporator, 2 ozs drier, 2 ozs compressor. Spin compressor shaft by hand after oil is put in so it coats evenly inside compressor so it does't liquid lock when first engaged. Put vacuum on system take it down to 29-30" for 20 minutes or so. The vacuum will boil out any moisture(H2O)in system, make it dry. Shut down vacuum pump, and then wait 5 minutes, and check to see that system holds the vacuum. if doesn't it has a leak. recommend putting 1/8th oz A/c dye in at this time makes it easier to find any slow leaks later in system. If system calls for 3 pounds freon,deduct 80%,(28.8ozs) then charge as close as possible with 12oz cans( 2cans). Ok to be low a bit, but not good to be over charged.First can will be sucked right in by vacuum in sysytem without even running compressor. Best to get all info you need about old r12 capacities and use them. too much oil it won't cool, too little freon it won't cool well. put pencil thermomter in ducts in cab. if you get it down 45 to 50 degrees idling, and not moving you in the safe range for compressor.Why 80% you ask for freon...R134 compresses into a liquid at higher pressure, and exspands more volume back to a gas than r12.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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