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Why is one side of the car air conditioner hot and the other side cold?

2 Answers

MacEloise

07/24/25 5:06pm

Here are the reasons why one side of the car air conditioner is hot while the other side is cold: 1. Uneven temperature settings: Dual-zone air conditioning requires adjusting temperatures for both the driver and passenger sides. If one side is set lower, it may result in one side being hot and the other cold. 2. Incorrect adjustment of the hot/cold knob: For example, wanting hot air but the knob isn't turned to red, or wanting cold air but the knob isn't turned to blue. 3. Clogged heater valve: Automatic dual-zone air conditioning uses two water pipes to the heater core. If one pipe is clogged and the other isn't, temperatures will differ on each side, resulting in different air outlet temperatures. 4. Malfunction of the air conditioning control unit: This can cause failure in controlling the hot/cold pipe valves. Try resetting the control unit.

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Russell

08/11/25 9:28am

Last time I got my car fixed, I encountered this exact issue. When the AC blows hot air on one side and cold on the other, it's most likely due to a stuck blend door. This component is located behind the dashboard and controls the mix ratio of hot and cold air. If the motor is rusted or the gears are faulty, the blend door won't move, resulting in hot air on the driver's side and cold air on the passenger side, or vice versa. It could also be caused by insufficient refrigerant or a leak, which makes the AC compressor work unevenly, causing one side of the piping to lack cold air and blow hot instead. Another possibility is a malfunctioning temperature control sensor sending incorrect signals to the AC computer, throwing the system out of whack. This problem is especially annoying in summer—the temperature difference makes passengers uncomfortable and affects driving safety. I recommend first checking if the cabin air filter is too dirty and blocking the airflow. Clean it and try adjusting the temperature again. If that doesn’t work, you’ll need to visit a shop for a professional technician to fix it, as electronic blend doors are tricky to handle on your own.

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