R-134a has a critical temp of 214F vs 234F of R-12. With less efficient condensers, portions of the condenser may hit 214F in low flow stop-n-go conditions, at which point the R-134a will not liquefy at all or very little ... leading to poor performance in stopped traffic/low air flow periods.No idea... but it would make sense since the OEMs changed to the parallel flow for R134.
According to the A/C forums and technical folks there, the condensor is the #1 thing that will improve the "coldness" of R134 in a retrofitted system.
So, I am going to take temp readings before/after and see how the condensor does, as the only major change made.
I would not recommend that anyone make the purchase yet, until it's kinda proven first. I agree that if it works as I'm expecting, it will be as cold (or better) than w/R12. That being the case, the price would be well worth it.
40 Degree vent temps are pretty good. The problem most of us have with R134a is the temps climb above that when in a low speed or idle state.
you will not see any temp difference at the vents.
Reason being, the expansion valve. Expansion valve keeps my R134 hovering at 40 degreee outlet temprature.. I am trying to find the TTB on the testing......
for the retrofit folks
650g of R134a per
Satan. Only thing changed in my car was the refrigarant, oil, and dryer canister. Nothing else. I have a robinair vacuum pump 6cfm rating that helped in evacuating the system.
Good luck with this though. I will be watching intently!
Which oil lubricant did you use, PAG or ester? Viscosity?
Did you pull the compressor to completely drain all the reserved R12 lubricant, or did you just simply evacuated the system?
Thanks for the info