The location of the car drainage channel is as follows: 1. Drainage Channel Location: The drainage outlets of the car door are generally located below the door panel, with at least two outlets per door. 2. Function of the Drainage Channel: The main function of the car body drainage channel is to guide rainwater along the channel to the outside of the car, preventing water from entering the interior of the car body and the internal sheet metal structure. This ensures a comfortable interior space and prevents premature rusting of the sheet metal due to rainwater. 3. Composition of the Drainage Channel: In typical hatchback cars, the rear pillar drainage channel is mainly formed by welding the upper section of the rear drainage channel and the rear combination lamp mounting plate. The upper part is welded to the roof, the side is welded to the outer side panel, and the bottom is welded to the rear outer panel, forming a water guide channel from the roof along the rear pillar to the bottom of the car body. Rainwater flows down along this channel, ensuring it does not enter the interior of the car body. The overlapping surfaces of the sheet metal are usually sealed with adhesive after welding. The rear door opening is sealed with a sealing strip, and installation holes for components such as taillights and wiring harnesses are sealed using bosses and sealing gaskets.
