DannyGLC63s

Hello,

I'm a new user here . Great to see a place like this!

I have a problem with my Mercedes GLC 63s Coupe.
I was in Germany at the autobahn, there's no speed limit in Germany at the autobahn as most readers know.
When I drove above 230km my car started to whistle. Really strange sound. All ventilators inside the car were open.

Below a video. PS. This wasn't the first time. Just the first time filming and posting.
There are no warning signs on any display as well.

Nixin

Is the vehicle equipped with roof rail crossbars?

DannyGLC63s

Nope, only a panorama roof which wasn't in use.

ParadigmDawg

I can't tell if that is wind or mechanical. My sunroof lets air in at speeds even when closed, so it could be that.

Teckno

its a safety design to emit ultra high frequency for animals to keep clear, with the lower audio spectrum designed to let the driver know it is working.
We need it here in Oz for kangaroos, wombats and the infamous Drop Bears, affectionately know as the Bundy Bear !!!
LOL - just kidding.
I will never get to experience that thrill as our roads are limited to 110Kph.
The rubber seals, either door or sunroof are most probably at max design, maybe a rubber lubricant will allow seals to mould and be better. We used a German product on convertible seals to help stop squeaks and give better seal agains wind.
Enjoy your speed.
Sorry for my Ozzie / Aussie humour !!

Relak

were the climate controls on at all? Next time you do it, give it a shot with the fan turned off and A/C off. I've had similar issues with previous vehicles doing this and it was attributed to a bad A/C condenser.

kwonza

Hello, was this issue ever resolved? I am having the exact same issue with my GLC43.