One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.Google+
Car Problem Reports
Chevrolet Avalanche 1500 Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail
Chevrolet Avalanche 1500 Problem
Average Mileage: 124,130 mi (69,561 mi - 215,000 mi)
Visitor, 2004 Chevrolet Avalanche 1500, 119,000 mi
when air is on,suddenly it switches to full heat.If i stop and turn the engine off then restart the air works again.
climate dual control both sides down to cold ac switch is on .blows cold air to passenger hot air on driver.
not fixed yet . looking for repair shop
Visitor, 2004 Chevrolet Avalanche 1500, 108,000 mi
Intermittantly, hot air comes thru driver's side when all selectors are off. This can happen when A/C is on also, but passenger side is cold. No codes come up on computer when checked. Replaced driver's side actuator door once with an after-market product. It's still doing it. Temp fixes include turning off engine and restarting; turn knob to defrost to redirect air; and recently found that pressing the recirc button helps too while driving. Does the driver's actuator door need to be replaced again? Does it need to be a GM part?
Visitor, 2004 Chevrolet Avalanche 1500, 85,000 mi
Dual zone air delivery - one side blows a/c cooled air and the other blows heated air in spite of temp control settings
Visitor, 2004 Chevrolet Avalanche 1500, 130,000 mi
The problem that I have at times is the air condition is hot on the drivers side vents, but cold on the passenger side vents
Visitor, 2003 Chevrolet Avalanche 1500
After battery removal air will only blow through defrost vents.
Visitor, 2003 Chevrolet Avalanche 1500, 160,000 mi
Climate control lights for the passenger no long illuminate, when setting is on cold, cold air will blow on drivers side vents, but heat (that is hotter then the blazes of hell) blows from the passenger vents.
With air conditioning on, sometimes blows hot on passenger side, cold on driver. Sometimes opposite. Turn off engine, restart sometimes let's air conditioning work again
Visitor, 2005 Chevrolet Avalanche 1500, 120,000 mi
Cold air turns in to hot heat from vents while driving. Can stop and shut engine off and restart and cold air blows again
same as above.