Peugeot 308 air volume knob switch, the engine whines when it is closed. What happened?
Hello, it's not easy to judge without seeing the current car. There may be many reasons. It is recommended to go to a professional garage for inspection.
My excellent version, the method is to turn the right knob under the central control to the warm air position, and then adjust the middle knob to control the air volume. I suggest you read the instructions carefully.