I'm running out of options with my 325ic. The last thing I haven't checked is the temp sensor. Does anyone have experience with these? Do they go bad? If not that then it must be more serious like a faulty head gasket or (gulp!) a cracked head. )o: It just seems to me that if it were the head or the gasket, the temp would continue to rise until it boiled over. Is this correct? All help greatly appreciated.