Follow the steps outlined and record the codes for later reference.
1) Turn on the vehicle.
2) Turn on the AC system to any setting.
3) Hold down the AC and the Recirculation buttons at the same time.
4) While still holding the AC and Recirculation button, turn the driver’s side temperature control knob
clockwise one click.
5) Release the AC and Re-Circulation buttons.
The code numbers will be displayed on the screen one at a time.
22 or 54 – Left temperature door is broken.
24 or 56 – Right temperature door is broken.
Your Codes: ___________ ____________ ____________ ____________
HeaterTreater II Blend Door Diagnosis