Where is the sunroof drain hole located on a Mercedes-Benz?
2 Answers
Mercedes-Benz drain holes are found on both sides of the sunroof track, where there are water outlets. Pour water into these outlets on both sides to observe whether the drainage pipes are unobstructed. Solutions for clogged drain holes: Observe whether water flows out from the front fender liner. If clogged, check the cause and remove debris from the sunroof track. Use an air hose to blow out dust from the sunroof opening. Additionally, there are two water outlets covered by rubber plugs in the trunk and the upper part of the door frame. Cleaning methods: The door drain holes can be unclogged with hard objects like iron wires. Be especially careful when cleaning the drain holes hidden in the rubber sealing strips to avoid damaging the seals.
My older C-Class had a sunroof leakage issue before. When I took it to the shop for repair, the mechanic specifically showed me the drainage hole locations. There are two small holes hidden beneath the plastic cover of the windshield wipers at the front – you can't see them without removing the cover. There are also two more holes on the inner side of the rear wheel arches where you can feel the rubber tube openings with your fingers. Last time, the rear holes got clogged with leaves, causing water to seep into the trunk and flood the spare tire well. Now, I regularly lift the plastic cover under the windshield and use a bicycle brake cable to clear the holes. Honestly, Mercedes' design is too concealed – you have to crouch by the front of the car with a flashlight to inspect it properly.
