Mercedes Benz Sunroof Rattle Repair

Vehicle: 2014 ML 350.

Symptoms: Mercedes Benz Sunroof Rattle when driving on unpaved roads. Distinct rattle and or knocking inside cabin while going over bumps, can easily be mistaken with suspension failure such as stabilizer links or strut mounts. Rattle or noise is permanent and doesn’t seem to be affected by weather or other factors.

Problem: Knocking sound or rattle comes from sunroof, noise bounces of the car and is sometimes hard to pinpoint. What you do, drive on bumpy road and keep your hand on sunroof glass to feel any knocking or rattle.

Repair: Removing entire headliner is very hard and time consuming but there is a way around it. First remove all four (front and rear) handles above doors.

To remove handles use a flat screwdriver to remove clip covers then press on handle metal clips while pulling on handle, will come our easily. Metal clips will remain in place, remove them too by squeezing on sides, can be dome hand or use pliers.

Next step, pull on headline to unclip it, pull on sides headliner until is lowered so you can fit your hand in there. Now you can see sunroof Torx screws. There are quite a few of them, on centre bar separating sunroofs and on side bar, 7 screws all together.

Use a small ratchet to tighten all screws, which are 2 different sizes. There is not much space but there is enough to reach all of them. Screws would not need much to tighten, about 1/4 to 3/4 of a turn.

Test drive the car and see if rattle is still there, if not reinstall headliner. Push headliner in place first and then reinstall handles.

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