Mysterious whistling

Yesterday I noticed that when braking from 30 mph (to about 10 mph, then it stops) something makes a whistle. I thought it was the front brakes, so I opened the window but suddenly I didn't hear anything. So, I played with it for a while and I found out that the whistling can only be heard when my window is closed.

I read something about the overpressure in the cabin, the overpressure flap in the trunk, the inner / outer heating circuit and I don't know what else, but here it doesn't matter if I have the heating on the inner, outer or completely off. And most importantly, it really only whistles when I brake, not when driving.

I absolutely don't understand it, I don't see any connection there. It's true that the "radio technician" solves it. I noticed it, because I just finished playing the playlist on AppleCar and there was silence in the car. When listening to the music, it´s not possible to hear.

Anyone have any ideas? Attached are photos of what my door seal looks like. Could it be that? But why does it only do at a certain speed, and especially only when braking?

Warranty repair definitely not solve this for me, in authorised Skoda garage will say with almost certainty that it is the seal. They will make a lot of money from it and it will continue to do the whistling anyway. If no one has any idea than it´s ok, I will let it go. It's nothing terrible, but I wonder what it could be.

Otherwise, how difficult is it to replace the seal around the door? I mean like the seal on the car body. According to the photos, it seems that it is necessary to dismount the plastics at car floor + part of the dashboard, the lever for opening the hood, etc., because part of the seal is behind it.

Edited 14 March, 20215 yr by MinionBob