The heat is stuck on my 1996 Jimmy...Any Ideas?

Question

The AC is working, compressor turns and receiver gets cold but no matter what the temp setting hot air comes out of the vents. I replaced the vacuum hoses but no relief. I just want an idea of what I'm getting into before taking apart the dash.

Answer 1

the vacuum control that moves this door inside your vents that control the airflow, yours is stuck open to hot air, either that control is broken or the hinge connecting the door to it is broken, I would seek the help of a mechanic.