The blend door is not working right or the in car air temperature sensor is faulty.
Removal & Installation
Air Inlet Door Vacuum Motor
To Remove:
To Install:
Do not attempt to bend any part of the air inlet duct door lever.
Defroster Door Vacuum Motor
To Remove:
To Install:
Do not attempt to bend any part of the defroster airflow mode door lever.
Floor Console Register Duct Vacuum Motor
To Remove:
To Install:
Do not attempt to bend any part of the floor console register duct door lever.
Panel/Floor Door Vacuum Motor
To Remove:
To Install:
Do not attempt to bend any part of the airflow mode door lever.
Auxiliary Air Distribution Blend Door Actuator
To Remove:
To Install: 
Auxiliary Temperature Blend Door Actuator
To Remove:
To Install:
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In-Car Temperature Sensor
Removal & Installation
To Remove:
To Install:
How do i get the rear passenger door actuator off
SOURCE: heater on blowing cold on driver side and hot on passenger side
This sounds like an air damper is not operating, maybe a cable sticking or a vacuum line come off.
SOURCE: 2004 chevy subarban blows cold air on one side hot air on other side
i was a GM mechanic for many years, the problem you are having is one of your mode door actuators has gone bad, most of the time it is the actuator on the drivers side that causes the problems, i have seen this many times, sometimes you can take it to the dealer and they can hook the computer up to it and recalibrate it but most times it has to be replaced , it is located under the dash in the area above your gas pedal.
SOURCE: heat works on driver side, passenger side blows cold air.
Did you check your coolant level or was it low and you added to it at some point? If so the system my need to be bleed or worst case the thermostat is going bad.
SOURCE: Air/C, blows hot air on drivers and cold air on passenger side?
The vent actuator my need to be reset, this can be done by removing the HVAC fuse from the fuse panel for 5 min or disconnecting the battery. If the vent actuator does not correct it self, then it's most like going to have to be replace due to internal parts have broke in the actuator.
Thank you for using fixya and it's common for the vent actuators to go bad after a few years, the internal parts are made of plastic and get brittle after time.
SOURCE: no heat of drivers side blows cold air while
Replace the door blend actuator behind glove box, approx $150 for part, Everyone I know with dual control on the silverado's have this problem.
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