Originally Posted by bigbadbonneville

, No i dont want to convert it to R-134 thats not the question or I would have done it. but converting a system would mean tons of money like 1000 - 1800 dollars. changing the evap core, the lines, the compressor and numerous of other parts like seals and what nots, for what, the system works flawlessly with R-12 and if it means going to the dealership and spending $250 - $300 in just a recheck and recharge then I will spend $250- $300. The question is the mechanic put Freeze-12 in my system and since its 80% R-134a and 20% R-142b is this going to ruin my system being R-12. (He did evacuate all existing freon from the R-12 system and also used R-12 Mineral oil and not ester for R-134)

Originally Posted by GAMEOVER

at the shop i convert many cars over to R134a weekly its a rather cheap and ez process
check you info you dont have to change anything but a few fittings

R134a doesnt ruin any seals or any components
Please before you get Bogus in check with you Local GM dealer 1st

Originally Posted by LakevilleSSEi

I don't know where you're getting this $1,100-$1,800 bill for converting to R-134, I did it MYSELF in 15 Min, for $40 bux from the local parts store. Only thing I couldn't do was vaccum down the system.

All converting really needs to be done iss changint the fittings to accept the R-134a fittings, sucking it down, and filling it back up. The seals can hold it just fine.

Originally Posted by chuck03

It'* my understanding that to work properly, the R134 must be compressed much more than the standard R12 to generate the same effect and many older cars with the 134 conversion cool less and at a standstill do not cool at all.

Also, to add to that, if you go with any "off brands" or modifiers to the R12 system then people that work on air conditioning will not reclaim your modified R12 because they will taint their system. Many modifiers also include flammable materials that can be hazardous should you be in an accident. Bottom line, if you have an R12 system, its best to stick with an R12 system.