I have a 2001 with the rotary dial climate controls. Yesterday I was off roading and noticed my climate control is stuck on heat. If I turned the ac on or the vents to cool air it just stayed on heat. I was in the maintains so it was not a big deal. One time in the late afternoon it worked and went cold with both ac and the vent air. All vents work for changing the airflow like defrost, face, feet, etc. most issues I found are related to vacuum leak not adjusting the climate control vents. Thanks.