I have a 94 Cadillac sedan deville, smooth running car, all computers intact and working properly, all new spark plugs, full AC coolant, When I try to run the AC it automatically sets itself on "economy" and does not get cool. after about 10 minutes it shuts off and the information light says " low AC refridgerant" I had the ac compressor replaced a little over a year ago, but the mechanic who did it now has a warant out for his arrest, and is being hunted by the FBI for buying junk parts with bad checks and telling people they were new installed. I cannot afford anything over to get it fixed, but I must, I live in south florida with a toddler and am due again in November. If anyone can help I promise a best answer and high rating!
I have purchased a can of stop leak freon and attempted to fill me compressor only to have the compressor be full and not accept any freon from the can. checked the lines, no leak.

“SIT” is a newly developed, very simple, inexpensive and reliable system for Self-inflating Tires. SIT is an integral tire component that uses atmospheric air to automatically inflate the tire. As a main source of energy it uses only wheel rotation, so there is no compressor or similar additional device needed. This ensures maintenance-free, constant tire pressure over the lifetime of the tire, with great benefits. It reduces tire wear, increase fuel economy, makes your drive more safe and steering more accurate. Note: In the US alone, 4.5 million tires have to be replaced before their designed lifespan as a result of under-inflation. 87% of all tires have a history of under inflation. Poor tire pressure also costs US an extra .7 billion in fuel annually. Source: www.selfinflatingtire.com