Drivers and Passengers Side Vent Temperatures Vary By More Than 20 Degrees F (11 Degrees C) (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 doors are malfunctioning

Do the following troubleshooting:

Recirculation Control Motor Circuit Troubleshooting Recirculation Control Motor Circuit Troubleshooting (With Climate Control)

Driver's Air Mix Control Motor Test Driver's Air Mix Control Motor Test (With Climate Control)

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