I didn't realize that. Thanks for the info. I thought the compressor button had to be on for the compressor to be running, even in BILEVEL?

Wow. I thought for sure I was the only guy that ever had this problem. Is your defrost air as hot as it was before your compressor started coming on? Or is it cooler because it's mixing with cold air?

I will. But I've posted this on several forums, and nobody seems to know the answer. I've had servos stuck on hot or cold before, and changing the servo usually cured that. But nothing like this. I was guessing it's electrical, but now I'm not so sure.