This sounds like a blend door actuator problem. Here is some diagrams to show you which one to replace.
Here is a guide to help give you an idea on what you are in for when replacing one of them
Try to see if you can calibrate the system first. Here is the calibration procedure.
The heater-A/C control module must be recalibrated each time an actuator motor or the control module is replaced. If the vehicle is so equipped, the calibration procedure also includes rear HVAC positions for each actuator motor.
Turn the ignition switch to the ON position.
Simultaneously depress and hold the Power and Recirculation buttons on the heater-A/C control for at least five seconds. The manual heater-A/C control power Light Emitting Diode (LED) and Recirculation LED, or the Automatic Temperature Control (ATC) heater-A/C control Delay and Recirculation graphics will begin to flash when the calibration procedure has begun.
The calibration procedure should take less than two minutes to complete for the manual heater-A/C control, and less than twenty seconds for the ATC heater-A/C control. When the LEDs or graphics stop flashing, the calibration procedure is complete.
If the LEDs or graphics continue to flash beyond the normal three minute (manual) or twenty second (ATC) calibration time, it indicates that the heater-A/C control has detected a failure and a Diagnostic Trouble Code (DTC) has been set. Use a DRB III scan tool to perform further diagnosis. Refer to the appropriate diagnostic information. The LEDs or graphics will continue to flash even after the ignition switch is cycled OFF and ON, until a successful calibration is completed or until the vehicle has been driven about 13 kilometers (8 miles).
If that does not work you would need to take it in to have it scanned for trouble codes and diagnosed from there.
Hope the calibration works out for you.
Please let us know what you find so it will help others.
Images (Click to enlarge)
Tuesday, January 10th, 2017 AT 3:08 PM