If you acknowledge a noise on your car, you are right to be aware of it and take it seriously, although it is possible that nothing serious will happen, it is also possible that it is the sign of a more critical restoration. A noise that appears in the trunk of your Mercedes Classe C 3 is luckily more a indicator of a small manipulation or restoration, rather than a difficult one. To support you in your research, we have decided to write this article to present you with the most likely solutions to your issue. First we will see that this trunk noise on your Mercedes Classe C 3 can come from accumulated dirt, the issue can also come from a loose lock and finally, it can even come from a simple rivet that sits inside your bumper.
Noise in the trunk Mercedes Classe C 3 : Accumulated dirt that triggers poor closing
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We will therefore start with a trunk noise on your Mercedes Classe C 3 created by dirt accumulated on your joints, lock for example. In fact, it is possible that on a car that is already a few years old and whose cleaning is not always a priority or that the roads used are not very clean that dirt accumulates at the trunk gasket. This issue triggers a poor closure of the trunk and a noise that can sound like a crack. To check if you are in this circumstance, open the trunk of your Mercedes Classe C 3, examine the condition of the gasket that goes around the entire tailgate and clean it with a wet/soap cloth, dry the whole thing and try to close the trunk and take a dentred road to see the impact. If this is not the case, continue to the other hypotheses that will probably give a solution. It is possible however that you have a trunk noise on your Mercedes Classe C 3 that is linked to other origins such as shock absorbers, do not hesitate to read this article on the noises at the back of a Mercedes Classe C 3.
Noise in the trunk of my Mercedes Classe C 3 : Loose lock, clicking noise
Second possibility, you may also, over time, encounter a locking system that has taken up some play. And this is one of the most probably alternatives. In fact, knowing a trunk noise on your Mercedes Classe C 3 is very frequently linked to this issue. Different solutions are available to you subject to the level of play you have with your lock. The first is that oftentimes the offset is minimal and a simple greasing of the mechanism with thick grease is appropriate to fix the issue. Secondly, it is also possible that you really have a lot of play on your lock and that each time the trunk “jumps”, in which case you would have to strip off the cover that enables access to the lock (inside the trunk). Then, using torx screws, you unscrew the striker attached to the threshold, just push it back a little towards the inside of the trunk and tighten it again. Make sure to check the centering of the striker in connection with the trunk lock. If after verifying the trunk of your Mercedes Classe C 3 closes badly, it means that you have moved it too far, repeat the process by pushing the striker less.
Noise in my trunk Mercedes Classe C 3 : Rivet following plate change in the trunk/ bumper
Finally, one of the last possibilities. It is that following a license plate change you were unfortunate and that a piece of rivet fell backside your plate. In fact, when a plate change is done, to take out the old one the process used is to drill the existing rivets in order to release the license plate. Unfortunately, it can happen that part of the rivet falls into the hole of the bumper and it will therefore wander inside the bumper and can trigger an annoying noise. To check that it is this problem you are experiencing, and that you have a trunk noise on your Mercedes Classe C 3 linked to a rivet, you will need to check that it is in the tailgate open it and stir it to distinguish the noise. If this is your situation, you will have to take out the linings from the trunk to remove it. Finally, if it is your bumper, it is in this rarer and more disturbing situation, you will have to take out the bumper to remove the bits of rivet that are running around.
