Diagnose and Fix
If the car AC blows cold air on one side and hot on the other, there are a few different causes but it’s likely the blend door actuator, also known as the temperature blend door actuator or vent mode door actuator. We’ll cover what can cause your car’s AC to only blow hot or cold on one side, what other symptoms you might hear, and how to diagnose the blend door actuator if you think it’s the cause.