Engine Size: 1.6L
Country of Origin: United States
I'm converting from R-12 to R134A on a 90 Nissan Sentra and have a few questions.
1) What PAG oil should I use?
2) The condenser is parallel flow. Can it be thoroughly flushed or should I just buy a new one?
3) How exactly do I purge the old oil from the compressor?
1) There isn't really a set PAG oil to use with that compressor since it came with Mineral oil originally. I would recommend using an Ester oil like the one we have here. BVA Auto 100
2) If it is indeed a true parallel flow unit, which would be odd for a 1990 car to have one, you will need to replace it. HECAT has a paper on flushing procedures and I doubt anyone around you have the proper equipment to do it. So the next best option is replacement.
3) To "flush" the compressor, you will want to drain the current oil out, add some oil to it and turn the hub so it spins and cycles the oil through and then drain that and refill it with the proper amount.
How much oil do I leave in the system and how much refrigerant????
It holds 6.75oz of oil if the system is bone dry. If you are replacing components and aren't flushing the system to bare metal. Any amount I recommend will be a guess at best. A good rule of thumb is to start with 80% of the R12 charge and check your pressures and add accordingly. Factory charge was 33.50oz of R12 so start around 26-27oz and go from there.
Any way you can repair it and fill it back with R-12?
I had a car I converted over to R-134 from R-12, and it never cooled that well, I even added two pusher fans on the condensor. I took it to a top AC shop, and they said it was working properly.
I do know I'll never convert over to R-134 if my car originally came with R-12. I'd either pay the R-12 prices, or fill it up with a some sort of "illegal" Propane/butane mix.
The talk of alternative and illegal products being used as a refrigerant in a MAC system is inappropriate and irresponsible. Please stay within the site sponsors request to offer advice and discussion about the proper and responsible use of R12 or R134a only. The concept of using propane from Home Depot will only end up with gaining you a Darwin Award.
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