[tyson]

Check for the switch/lever underneath the dash. It should be a white level or roughly 2 inches that one of the two cables goes to. The main cable hold often breaks here, and the valve no longer gets turned. Try switching it and then playing around with your heat. That was the problem with my heater, and numerous others I've talked to.

this is most likely your problem. its the air mixture flap.

crawl underneath, behind the center console and look straight up. youll see the white lever. the cable probably came loose. it should be obvious what to fix.