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Why does the Audi C6 blow cold air on one side and hot air on the other when the AC pressure is normal?

2 Answers

Valentina

07/29/25 5:51am

Why does the Audi C6 blow cold air on one side and hot air on the other when the AC pressure is normal? The reasons are as follows: Faulty heater valve: If the heater valve is damaged or not opening sufficiently, it can cause this situation where one side blows cold air and the other hot. It is recommended to visit a repair facility for inspection and repair. Faulty AC control unit: The AC control unit is used to regulate the temperature of the split-type air conditioning. It is recommended to use the substitution method to replace the AC control unit with a new one and check if the issue resolves. Faulty wiring harness connection: Use a diagnostic scanner to check for fault codes. Loose connections or breaks in the wiring harness can also cause this issue. It is recommended to inspect each wire connection one by one to ensure they are functioning properly.

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RemingtonLee

08/12/25 8:24pm

I've encountered this issue of one side blowing cold air while the other side blows hot air several times while helping friends repair their cars. Normal pressure indicates that the air conditioning refrigeration cycle is functioning properly. The most likely cause is a stuck or faulty blend door actuator. Dual-zone climate control systems regulate temperature independently, but if the actuator fails to control the temperature blend, it can result in hot air on the passenger side and cold air on the driver's side. Additionally, faulty temperature sensors may send incorrect signals, preventing the door from moving to the correct position. Outdated system software can sometimes cause misoperations and may require a reset or update at an authorized dealership. Aging wiring or loose connectors can also lead to inconsistent performance. It's recommended to first check if the air conditioning settings are consistent, then try resetting the system by disconnecting the battery. If the problem persists, promptly inspect the actuator or sensors. The Audi C6 commonly experiences issues with this actuator as a wear-prone component. Delaying repairs may cause the other side to stop cooling as well.

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