What is the drainage principle of a car's front windshield?
2 Answers
The drainage principle of a car's front windshield involves a rain collector panel on the windshield surface. When rainwater flows to this area, it is directed out through drainage holes at the front of the car's side beams. The lower decorative component of the front windshield is commonly referred to as the water channel trim. A high-quality water channel trim ensures uniform gaps and minimal surface discrepancies when fitted with the windshield. The functions of the water channel trim are primarily divided into two aspects: diverting rainwater and directing airflow in the engine compartment. Since the water channel trim is installed between the front windshield and the car's body frame, improper rainwater diversion can lead to water entering the engine compartment, causing operational issues with the engine.
I've been driving for over a decade, and every time it rains, I pay attention to how the water on the windshield flows into the drainage channels on both sides. These channels are designed along the edges of the windshield, directing the rainwater downward as it slides off, then out through the drainage holes at the bottom. If these holes get clogged, water can back up into the engine bay or seep into the cabin, soaking the carpets and even damaging the electrical systems. I make it a habit to periodically use a wire to clear them out or a small water sprayer to wash away leaves and debris from the channels. This routine has helped me avoid several waterlogging issues, especially when I check before the rainy season—it's the safest precaution. The drainage system is designed to let water flow out quickly, keeping the interior dry.
