Hey guys, just seeking some advice. This afternoon I replaced the monovalve in my 89 420SEL, and sure enough the old one had a torn diaphragm. I used the BMW valve that some folks had suggested. Now, the heat is working, but I'm getting coolant leaking apparently from somewhere: as in white sweet smelling smoke coming from the immediate area of the monovalve as well as some from the air vents. (Coolant level is fine for now). Do you think I cracked the plastic valve housing?