1992 Toyota Camry DX Auto , 2,2L AC conversion R12 to R134.

AC conversion R12 to R134. The system is empty. Tools on order for this job. Please give me all your ideas on this one.

I've heard many different approaches to doing A/C retrofitting like this. One shop I worked for just sucked the R-12 out and put R-134 in. Others will replace most of the system and flush the lines as well as possible. It all depends on who you talk to. :lol:

Personally, I'd suggest replacing the compressor and accumulator/receiver drier, as these hold the majority of the refrigerant oil. I've been told that R-12 oil becomes acidic when combined with R-134 oil, and can cause all kinds of problems if allowed to mix. Use pressurized A/C flush wherever possible, and suck a strong vacuum for at least 30 mins before filling it up.

I did this a year or so ago on my mom's 1993 Accord while on a short visit. The system was pretty much empty so I replaced the receiver dryer. I simply went to the auto parts store and bought the conversion "kit" they had on the shelf, rented a vacuum pump and gauge set, and followed the instructions in the kit. I think I had to buy an extra can of refrigerant to get enough for the system. The kit came with a can or two of refrigerant with oil already in it. I did not replace the compressor and I did not flush anything as the kit didn't require it. I was a little worried about mixing the oils but did not have time to do a full flush of the system. I did replace the schraeder valves before installing the new R134a fittings as I could tell that's where the system had been leaking. I am 2000 miles away from her but she messages me every now and then and says "My AC is still blowing cold and I don't have to use rags anymore for defrost in the winter. Thank you!"

If I had more time I would have done the full flush but it is still working after a little over a year. She knew I was a bit skeptical of how long it would last but it's done pretty well so far.

Cool thanks very much. The oil issue was my biggest concern.

Cool thanks for the info.