I have heat on driver side but blows cold air on passengers side

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! When your 2013 Lincoln Navigator has heat on the driver’s side but blows cold on the passenger’s, it’s likely a blend door actuator issue. These little motors control where the heated or cooled air flows, and it sounds like the one for the passenger side might be stuck or failing. Sometimes, a recalibration of the HVAC system can help—essentially resetting the actuators. You can try disconnecting the battery for 10 minutes to see if that forces a reset. If not, the actuator will likely need replacing. It’s tucked behind the dash, which isn’t fun to access but worth it to avoid a one-sided arctic blast. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.