Postby Hook » January 27th, 2010, 10:29 am
^^^ There's no "better" gas to use. You use what the system was designed to take. Newer systems use the R143A.
The older AE100 Corollas use the R12 gas. It's marked on the compressor. Switching to the R134A is not a simple matter of just pumping in a new gas, components need to be changed and it costs ALOT. There's even particular grades of oil to be used for the each of the different gases.
When one of my lines burst and it was repaired and filled withthe R134A, I never got the cooling I used to get, until I was alerted to this and shown on my compressor that it uses the R12, I made the change back to what it's supposed to be and it's been working great ever since.