Thanks Mike and Jim. I've got my fingers crossed but everything has been fine all day. I think the major problem all along was the fuse. I'm an electronics guy by trade, but before I got this car I would have never suspected an intermitant fuse (this will be the second I've had). I suspect that the fuse was high resistance where it had broken. That is why the low speed never came on with the ac (not enough juice), but the high speed came on at high temp. I'll check out the link for my new fuse card.

Ken Fuller
1990 300E (on the road again)
145K miles