I own a 2002 Mercury Sable and have been having AC problems. AC works perfectly in and around town. When I get on the highway after about 1-2 hours the AC stops working. I believe the blower works but only hot air comes out. If I stop for a while and let the engine cool down, the AC works perfectly again?!?! Last time this happened, looked like frost was coming out of the vents. Shut everything off, stopped for a bite to eat, got back in the car and everything has been working perfectly since. Took it into mechanic (dealership is too far for me) and they checked everything out. They could find nothing wrong. They let it run for about an hour and it worked fine. Said it could be condensation in the system and it would need to be evacuated??? (I think) Anyway, cost would be over $200 and they could not guarantee it would fix it. They told me to come back when it fails again. Which is difficult since it always happens on trips. What gives?? Any suggestions? Kathy

Hello Kathy... the condensation information is correct if that indeed is what is causing the problem. A small amount of condensate or a even a little bubble of air in the system will create a problem....the evacuation process pulls a deep vacuum on the entire a/c system & basiclly sucks everything out of it, debris, water, air, freon and all in to a closed "enviro friendly" containment machine...your freon can then be reused. My suggestion would be to call around to other shops and get some repair costs estimates for an "evacuation and recharge" for your Sable...
A specialtiy shop that deals only in A/C service might even be your best bet...but i would get at least 3 quotes. The dealers, or stealers as i call them, are almost always on the high side and have a catch that will get you a return visit. I hope this helps, feel free to ask more questions if needed. Like Papa always said---the only dumb questions are those that never get asked...
Good luck with your Sable