Weird noise in cabin this morning
Thread Starter
Newbie
Joined: Nov 2025
Posts: 2
Likes: 0
2021 c43
Weird noise in cabin this morning
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
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
Super Member
Joined: Dec 2015
Posts: 599
Likes: 237
From: Suburban Maryland
2023 E 450 Sedan. 2018 GLC 300. 2013 E 350 Coupe (retired)
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.
Thread Starter
Newbie
Joined: Nov 2025
Posts: 2
Likes: 0
2021 c43
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.
