If the head gasket was failing wouldn't coolant be leaking? As far as those seatbelt presenters I think I know what you are talking about. They are those little tracks that slide the seatbelt forward so you don't have to reach for it, correct? If I pull the fuse won't they be sticking out where it will interfere with entry into the rear seat? Also, won't other accessories be inoperatable if I pull the fuse?