We turned our furnace on this past Sunday and when the blower started, the air coming out of the vents smelled unusal, almost like burning plastic. We have a 12 year old Trane gas furnance. We called the furnance service company, and they are sending someone out tomorrow. They said it sounds like a problem with the blower motor. Since hot air was coming out of the vents, this would indicate that the blower motor was working. Any thoughts?