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Q:

sometimes my air cond./heater gets stuck and blows hot air with air cond on? on 2001 GMC Sierra 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
has only happened twice this july. goes away when engine is shut down and cooled.
(1) Answer
same problem on toyota highlander, seems tightening the nut under the selection knob that holds the selector in place, solves the problem....temporarily anyway. guess i'll try some locktite next time to make it more than temporary.