Mercedes Benz

  Body Seal Integrity, Weatherstripping Failure, Cabin Ingress Fault, Trunk/Frunk Water Leak, Drain Tube Obstruction, Diagnostic Overview The System: Vehicle water management relies on a "Primary" and "Secondary" seal system. 1 The primary seal is the visible rubber weatherstripping , while the secondary system consists of hidden drain channels and tubes designed to guide water away from the interior and toward the ground. The Problem: Leaks usually occur when a seal becomes "set" (permanently compressed), misaligned, or when the drain paths become clogged with organic debris like leaves and pine needles. Common Failure Points Pinch-Weld Misalignment: If the metal lip (pinch-weld) that the rubber seal sits on is slightly bent, the seal won't make full contact with the door or trunk lid. This creates a "micro-gap" that high-pressure rain or car washes will exploit. Clogged Sunroof Drains: This is the #1 cause of "mysterious" we...