So I was out today and it was freezing cold, so I had my heater on. Well I went back out and started it up and the heater just stopped working. Now it makes a clunking noise whenever I try to change it (like defrost to feet and head, that control), but no heat or anything comes out of any vents. I also noticed that when I push the air circulate button (I think that's what it is) I get this really loud whining noise coming from the passenger footwell, also my heat shield is kind of hanging off the bottom of the car, that wouldn't be getting in the way of anything would it? And the car is a 1992 LX coupe. Thanks.