Actually I just got the car less than a month ago. I have a few days on the warranty - I think it expires this week. Erol's Autobahn couldn't find any leak . . . but the mechanic was saying something about maybe air in the system, but I'm not a mechanic and didn't know what he was suggesting. Erol seemed to think it was running too well for it to be a serious problem, but this does concern me . . . head gasket or cracked head.

They put on a new radiator cap.

Thanx for all the replies.