There is sound in hot air outlets

Hello Friends, I am new to you, I would like to benefit from your experiences. There is a problem like this. When I turn on the heating system of my vehicle in cold weather and generally I experienced this in the AUTO button. Sounds like snap roof during the flight. What is the reason. My vehicle is 407 -2006 1.6 HDI Executive model.

If nothing is going to the propeller when it warms up, it can be one of the signs of the fan.

Now I don't think anything has touched the propeller, as if the heating is working especially in Auto.

[QUOTE = exclusive] Now I don't think it is worth anything to the propeller, as if heating is working, especially when working in Auto.

Yes, it sounds like it is giving direction. I don't hear it when you just press it on one side while it gives heat to one side.

My friends car has digital air conditioning. When I press the glass button, the air conditioner starts operating at the same time. I wonder longitudinally in all digital air conditioners.