What Causes Water in the Cab?
3 Answers
Specific reasons are as follows: 1. Not closing the windows during rainy days: After getting out of the car, failing to confirm whether the windows are tightly closed can allow rainwater to seep into various parts of the car through the unsealed windows. Over time, water will drip from the bottom of the car's cab. 2. Issues with drainage outlets: After ruling out human factors, if water still drips from the bottom of the cab, the car's drainage outlets should be checked. There are four drainage outlets in total: the front two are for sunroof drainage, and the rear two are for draining water that flows on the car. Additional Information: The structure of the car cab mainly includes: The cab shell, doors, windows, interior and exterior decorative parts, dashboard and body accessories, seats, as well as ventilation, heating, cooling, and air conditioning devices, etc. For trucks and specialized vehicles, it also includes the cargo box and other equipment.
I've encountered quite a few cases of water leakage into the cabin, which is often caused by issues with the vehicle's sealing components. Firstly, the sunroof drain holes are particularly prone to clogging - when leaves or debris block the drainage tubes, rainwater can backflow into the interior. Secondly, if the door or window seals age and crack, water will seep in during rain. Poorly bonded windshield adhesive can also allow rainwater to leak in due to air pressure differences at high speeds. When the AC system's condensate drain pipe gets blocked, water may flow onto the cabin floor. Prolonged exposure can lead to electrical shorts from moisture damage and even mold growth with unpleasant odors. Upon discovering water intrusion, immediately check if the carpet underneath is wet and clean out the drain holes. For severe cases, visit a repair shop to replace sealing components. As prevention, avoid parking under trees regularly.
Last time my car got flooded, it really annoyed me. It happened during the summer rainy season when the door seals came loose, allowing rainwater to seep in through the door gaps. Another time, I parked on a sloped roadside, and water flowed backward through the AC vents—probably due to a clogged AC drain pipe. Windows not closing tightly can also be a cause, though usually not obvious. If the sunroof is left open or the seal is damaged, even light rain can slowly seep in. When I noticed the cabin was damp, I first used towels to soak up the water, then lifted the floor mats to check the source of the moisture. Simple fixes include replacing the seals or unclogging the drain holes—don’t delay too long, or the car will develop a musty smell and become uncomfortable. Now, I regularly flush the sunroof drains to avoid a repeat.
