Temperature blend door actuator is probably stuck on heat position , needs replacing more then likely. Videos on youtube showing how to replace it .
https://www.youtube.com/watch?v=4wPg6uJCNcs
Now as far as it shutting down , that could be any number of thing's , could cost a lot of time an money tracking that down . It would be best if when it shut off it wouldn't restart ,easier to fix that way .
One thing you should do is have a full vehicle scan done at a qualified repair shop. This will check for DTC'S - diagnostic trouble codes in all the computers on the vehicle.
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SOURCE: 2004 GMC Yukon Denali
My wife had same problem in 2005 yukon. Turn both temperture controls on dash all the way as warm as they will go, Wait about 1 or 2 mins and turn back to coolest setting. Cleared our problem right up. Do this with car running and air on.
SOURCE: my air blows hot even tho my climate control is on cold
U have a stuck air temp control blend door, either the actuator motor is defective or the door is warped and has jammed, one thing is that u must remove the dash to rcheck replace these parts.
SOURCE: 2004 gmc 1500 heat is only blowing on passenger
sounds like you have dual zone climate control in your truck. Most likely the actuator that controls the temp door in the HVAC box
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