Freon
 

How much freon (134) does a factory a/c 66 GTO with a newer Sanden compressor require?

Brian

Guessing 3-4 Lbs. but the only accurate way to do it is with a pressure manifold and monitor the upper and lower side of the system when running. Guessing isn't going to work well enough to make the system run at maximum efficiency. Too much on the high side and you'll be cutting the compressor life down, not enough and your efficiency is down. If you don't have the gauges pay someone to do it and not chance blowing the compressor up. My 2 cents.