When you put the ac on in your 2004 Chevy Avalanche one side blows hot air and the other side blows cold air?

If your 2004 Chevy Avalanche is blowing hot air on one side and cold air on the other when the AC is on, it could indicate a problem with the blend door actuator or a refrigerant issue. The blend door actuator controls the temperature mix of the air, and if it's malfunctioning, it may not be directing airflow correctly. Alternatively, low refrigerant levels or a refrigerant leak could also affect cooling performance. It's advisable to have a professional check the system to diagnose and resolve the issue.