I had this problem with my 2005 z71 xcab. It was all about the battery being disconnected; the ac's control module had to be reset. We turned off the truck and pulled all of the fuses related to the AC, turned the truck on, put the fuses back, then let it run for awhile. It didn't work at first but the next morning, voila! it was fine. Might also try having the dealer reset the truck's computer to the factory settings. It's a pain but it works too.
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either the heater control or the lil motor that adjusts the door is shot.
i believe the motor is on top of the heater box behind the radio for the vent function there is also a blend door motor on the side (hot to cold) of the heater box.unplug the vent motor cycle the defrost/ floor knob and test for power . no power bad heater control .power present bad vent door motor. auto wreckers are the best place for these parts (cheapest) some will also test/ install
maybe drop the blower motor and check the vents for obstructions. I worked on a friend's car this spring that had a two year-old repair bill sucked in to the blower wheel....it limited the air output but made a lots of noise in the process.
1. Oil coming from the ext. vent means Overfill fluid transmission or valve body problem (need to open the transmission to overhaul it) but usually overfill.
2. Do you have any transmission faulty code
3. If you pull a trailer, heavy load there is a function in PCM (powertrain control Module) that raise the pressure to compensate the slip at clutch pressure and if you unhook the trailer and go on the highway before the PCM learn it, it will shift hard. What GM call the "shift adapt". You probably have a 4L80E for transmission or the 4L60E depends on the truck's options.
hope it helps.