BuilderTheBob

My C300 (Canada) has less than 700 kms on it and I'm hearing a rattling noise under the passenger side rear seat. The noise is pretty noticeable when the engine is idling, and it gets worse as I move into 1st gear. The strange thing is, there is no noise when there is a passenger sitting on the seat. Which leads me to believe that something within the actual seat has come loose.

Has anyone else had any noise issues with their seats? Can I lift up the rear seats in any way? The issues started after I tested out folding the seats

djdj

Maybe you did not fold the seat fully to the upright position?

BuilderTheBob

No I checked for that. The seat is firmly placed up right. I also checked to see if the seat belt buckle or the holder is the cause. The sound seems to come from below the seat. When I press down on the seat (the sitting area) the noise stops. Sometimes the noise is really noticeable and sometimes it faint.

chicagofan00

How about where the seat belt clicks into? I have a rattle on my passenger seat and noticed it was only when I was alone in the car. Determined it is a plastic piece inside of the part where the seat belt clicks into. Haven't taken it to the dealership just yet as it hasn't annoyed me enough but it's getting close!

Gungaslow

Ever find the rattle?

BuilderTheBob

Nope. The funny thing is the rattling stopped in the summer, I'd occasionally hear something, but not too often. I'm hoping I don't hear it again this winter. Lets see..