I am a very happy 300D owner once again. On the way home from work yesterday, my AC turned to heat like I've never known. Today I changed the thermostat, and took apart the coil. It was very corroded. After spraying it with carb cleaner and letting it soak, dried it off, and presto I have cool air again. And, with the new thermo, the car temp is down about 10 degrees. Thanks for everyone's suggestions.
[This message has been edited by TCCBass (edited 04-13-2000).]