I have the same problem. 1998 Ford Escort SE Wagon. It just quit one day last summer after being started up in the heat. It blows air, just not cold air. The heat works, as does everything else... just no AC. I was thinking that the compressor was bad, but now this seems like the most likely culprit. Are there any directions or guides online for how to fix this/diagnose it? I've just gotten into mechanics, so although I may know some stuff, I couldn't do a job like this flying solo if my life depended on it.