lexsc3

So Im trying to figure out what I need to change on my SC300 to get it to run perfectly on r134a. Anyone have a list? Im just going to source used parts and convert it myself. are all 94 and up SCs have the same part numbers with all the part? I have found some lines from a 99 will they work? I figure I need a compressor, evaporator, condenser, hard lines, dryer, and all o rings and nuts and bolts. Will the wiring for the compressor the same as the one on my 92?

Duck05

I had a shop convert my '92 but had to have another shop redo it due to poor implementation by the first one. Even with that the R134a seems to "escape".

The O Ring installation is key as R134a has smaller molecules than the R12 and will tend to leak. R134 systems require more frequent recharging and typically do not run as "cold" as R12.

I am sure there are others more qualified and experienced on this topic and can provide additional information.

megamax

iTrader: (9)

really?? so the r12 is colder??/

lexsc3

Ive done the universal kit conversion like your talking about. Im just not happy with having to refill it every year and how its only cold when on the move. I drive a lot of stop and go traffic and its pretty terrible for that. In the summer, I just drive another car just because I cant stand being hot will sitting in traffic or at a light. I also don't drive my SC300 in the snow, so the car basically doesn't get driven. I feel like converting it to a complete r134a system that is purely designed for r134a will at least get me to drive the SC300 more.

Duck05

That is what I have been told and based on the current performance in my SC300 it seems true. Definitely the car has to be moving to get it blowing cold.

R12 is very expensive now (especially in CA due to environmental woes) so converting to R134a has some pluses. I have seen recharge fees as low as $20 and it only takes 20-30 minutes or less to do it.....

SC400slide

iTrader: (11)

When I converted my R12 into R134, all I changed out was the A/C compressor, (with an R12 one), and the cap adapters for the schrader valves on the high and low ports. If you do not swap compressors, the entire system will need to be completely clean from freon and the like.

lookEVO

iTrader: (1)

I used to do alot of these, and more often than not... the only thing I replaced was the reciever/dryer(or orifice tube), accumulator. Flush the lines with some AC flush solvent, add the schrader valves and make sure all the o-rings are good.

Compressor doesnt matter that much.