What causes the left side of the Audi A6 air conditioning to be cold and the right side hot?
2 Answers
Audi A6 experiencing cold air on the left and hot air on the right can be attributed to the following reasons: 1. Damage to the air conditioning warm water regulating valve, caused by an internal short circuit in the warm water valve. 2. Motor failure, leading to the inability to switch air ducts. Below is an introduction related to car air conditioning: 1. When the heating function is turned on, the high-temperature coolant from the car's engine flows through the heater core, and the air blown by the blower also passes through the heater core, allowing warm air to blow out from the air conditioning vents. 2. The cooling principle of car air conditioning is slightly more complex. After pressing the AC button, the compressor clutch engages, enabling the engine to drive the compressor. The compressor continuously compresses the refrigerant and sends it to the evaporator.
I worked at an Audi service center for many years and have encountered numerous cases of the Audi A6's left-side AC blowing cold while the right side blows hot. The cause is mostly a fault in the dual-zone climate control system, particularly when the air blend door actuator gets stuck or fails. In dual-zone AC designs, the actuator regulates temperature airflow to different zones—if the right-side actuator jams in the closed position or has insufficient power supply, it leads to cold air only from the left vents and hot air from the right. Another common culprit is faulty temperature sensor readings or loose wiring, often due to wear or dust buildup over time. I also recommend checking the coolant circulation, as the A6's dual-zone system relies on it to switch between heating and cooling sources. Don’t delay fixing this—visit a professional shop promptly to scan for trouble codes. Sometimes, simply cleaning the air blend door resolves it; otherwise, parts replacement (costing around a few hundred yuan) is needed. For safety, unstable AC can distract drivers, so regular maintenance helps prevent such issues.
