Hello,

I drive a 2021 c43 coupe, currently at 51k miles and haven’t had any issues with it so far. I bought it at 40k and have had it for around 5 months. Woke up as usual today, remote started my car about 5 minutes before getting into it and heard a weird whirring noise. It continued on and off while I drove to work (5-10min drive). After I got to work I went inside for a few and then started the car again and the noise was gone. I even drove a few minutes to test it and the noise didn’t come back. Just want any insight because I had a 2 hour drive planned for this weekend. It was very icy/cold out here in CT this morning as well. Link below.

https://youtube.com/shorts/2I1ZPTwq-sg?si=3gz4WAwXpQhJDkKJ

the sound does sound more aggressive/loud on video

Would be good to hear if this is also heard in the engine bay. If it were i would be more concerned. Try turning the heater fan completely off. To see if that is related. Could be electronics cooling fan or fuel pump or some accessory. I would drive it until I hear it again and have mercedes knowledgeable person listen.

I didn’t hear anything outside the car, but did not pop the hood to check as I had to go to work. Noticed it when I sat inside but I’ll be sure to check if it happens again