Originally Posted By: bunnspecial
Originally Posted By: Chris142
Originally Posted By: 123Saab
I honestly didn't know some folks still use it.
a few cars can't be retrofitted to R134a....well not easily. Late 80's Cadillacs and suburbans won't retrofit. Still have many of those around here. Enough to use up all my R12!
The Cadillacs are all computer controlled ac. The r134a has just enough pressure difference that it trips the low refrigerant light and turns off the system. The big suburbans are barrely adequate with r12 and r134 just won't cool them.
You probably know this better than me, but I've never been satisfied with an R134a conversion in any car(and that includes doing it "right" with complete purge, seal replacement, and then a pump down and fill with R134a and the proper oil). R134a isn't as efficient of a refrigerant as R12, and in my experience systems designed for R12 just don't cool as well on R134a.
I wish that it was legal to use propane/isobutane the mixture in the proper proportion operates at similar pressures to R12 and supposedly is a bit more efficient.
I retrofitted my 92 Accord and I get 41 degree vent temps on an 85 degree day. Everyone told me not to retrofit it, that it wasn't going to cool well, etc. I'm glad I didn't listen to them.