Driver's and passenger's side vent temperatures vary by more than 20 °F (11 °C)

Diagnostic Procedure 

Probable cause:

• The air mix doors are malfunctioning

  Do the following troubleshooting:

• • -

    Air mix control motor test*1

  • -

    Driver's air mix control motor test*2

  • -

    Passenger's air mix control motor test*2

• Low refrigerant charge

Also Check for 

• Climate control DTCs
• Harness/connections