With Climate Control

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

Probable causes: The recirculation control door or the air mix door is malfunctioning

Do the following troubleshooting:

Recirculation control motor test Recirculation Control Motor Test (With Climate Control)

Driver's air mix control motor test Air Mix Control Motor Test

Passenger's air mix control motor test Passenger's Air Mix Control Motor Test (With Climate Control)

Also check for

HVAC DTCs How to Troubleshoot the Climate Control System

Also check for

Poor or loose connections at the terminals