The oil is in the compressor. The vacuum removed moisture from the system, I think the moisture reduces the effectiveness and can lead to problems. The right amount of oil to add back in should be listed in the Factory Service Manual. I'm getting ready to convert my truck so I've been reading up. Supposedly the 2 oils (R12 and R134) are not compatible...I'm not sure why but I'm going to flush my compressor, change o-rings, and of course new drier. My condenser is busted, so new one of those for me as well.
what are you going to use for flushing? ackits recommends against flushing the compressor with any type of solvent. for all the other components except for the drier, we used acetone and compressed air into a bucket.
I've heard the same on moisture in the system.
Ester oil is compatible with R-12 residues if I've read correctly on the can. apparently, pretty much any of the 134 products out there now are compatible with R-12 residues and oils.
I can get the temp down to 46-49 F . I think the problem with the oil is that 134a doesnt mix well with the r12 oil so it doesnt circulate through the system well,which would make for a noisy compressor.The only systems Ive done this on were old so I dont know if they were any noisier than normal.In a perfect world tear it down,get the old oil out and replace it for best results , my old Dodge truck gets the $35 kit from wal mart,my Toyota doesnt have ac
those are good temps! my compressor is rattley. I am curious about the separate oil & refrigerant method. I still don't understand for sure whether the oil you add stays in when you evac.
