I have a Pontiac Grand Am, year 2000. Can't seem to get the air conditioner to work. I have tried everything. We have changed the condenser, low valves line, done the leak test and still it will only hold the freon for only 3 days and we are at square one again. I love this car, but it is July and I am in Texas! Help anyone out there have any suggestions other than just sell, what are my options? Anything the mechanics might be over looking?