About 3 months I started hearing the dreaded Mercedes creaks and rattles with my 2019 coupe (FL).

When sitting in the driver's seat it sounded like the creaks and rattles were coming from rear left (not exaggerating but it sounded like 10+ individual sounds which was driving me nuts) however when sitting in the rear passenger seat it sounded like the sounds were coming from the front of vehicle which didn't make any sense. I even stop driving the car for the last few weeks.

I eventually took the car back to Mercedes (on multiple occasions) but their diagnosis' ranged from rear parcel tray to seats but they could never fix the problems.

About 2 weeks ago I just had enough so I made a mate drive my car around while I sat in the back seat trying to narrow down all these damn creaks and rattles.

Eventually discovered the rear dome light was causing 1 of the rattles. Popped off the rear dome and discovered the dome light sits inside another plastic housing (plastic on plastic). Lined the interior of the housing with a thin layer of foam and popped the dome back in place which fixed that issue.

Next we tried to pinpoint the remaining 10+ creaks and rattles but sitting at the back seat....the sounds were coming from all directions which was overwhelming and eventually gave up.

Later that night I was sitting at home feeling defeated so I decided to turn to YouTube for help. Started coming across all these videos of people trying to fix creaks and rattles in their cars for all different makes and models.

1 thing all the videos had in common was a panoramic roof. Posters were complaining how the pano was emitting multiple creaks and rattles due to the design assembly of multiple plastic and rubber components.

From what I could see, the most recommended plastic/rubber conditioner was 303 Protectant (Blue bottle) which apparently conditions and softens rubber components and lubricants plastic.

At this point I was totally out of ideas so figured screw it, I'll give it a go. Following day I bought myself a bottle of 303 Protectant and generously lubricated all rubber and plastic component of the pano roof which took about 5mins.

I waited around 10mins (thought I'd allow for the solution to soak in) and then took the car for a drive.....what do you know....no freaking creaks and rattles!!!!!!!!!!. It's been about 1.5 weeks now and still everything is perfect.

Everytime I've driven the car since that day I've always had the sound system turned off so I can listen to the exhaust purr (honestly can't stop smiling) and not trying to musk nuisance noises.

 

Glad you got it sorted! I for one (being as OCD as one can possibly be) would go nuts in that situation if left uncorrected - and yea, you can't always just "turn up the volume!"

 

I am actually going to try this..

One place that is a noise maker, is the sunglasses holder in the roof console... if you have something in there.. it will rattle.. :-)

 

Yes, this car rattles and creaks a lot inside.
I moved from BMW M3 to FL C63s hoping that Benz car would have much better interior build quality.
Actually, it was the opposite. Rattle sounds coming from center, door, pano roof, and etc., it's far worse than my previous BMW.

I actually took out front driver's side door panel last weekend and put felt tape everywhere where it can make rattle noise.
I think I managed to fix noises coming from there now. Will have to drive more to see if noise comes back.

Also, I have this weird vibration noise coming from pano roof area that only happens when rpm is around 1100 and 2000.
It is also temperature dependent (I think), so it doesn't happen every time.

I shall check rear dome light housing later when I get a chance.

 

Rear dome light rattle was happening even on the smoothest roads which was driving me insame.

Pano creaks were happening on any road that was less than perfect and most times it sounded like a symphony going on.

I was driving the other day and realised I could hear small stones/rocks being.kicked up by the tires because it was so quiteeee inside the cabin

 

Ohhh good point! I had the same issue with sunglass holder so I stopped using it, will try to look look at it this weekend.