What causes water leakage at several positions inside the car?

[McLucille]

Reasons for car water leakage: 1. Air conditioning: Condensation water droplets produced during air conditioning use; 2. Cooling system: A malfunction in the radiator cooling system causing water leakage under the car; 3. Windshield washer fluid: Possibly windshield washer fluid dripping. Inspection and troubleshooting methods: 1. Method one: Check if the radiator coolant is missing, then inspect whether the cooling system pipes are loose or damaged, and check if there is any underbody scratching at the bottom of the radiator. 2. Method two: Ensure the coolant reservoir level is not too full, as it may overflow when the temperature rises. 3. Method three: Check the windshield washer fluid reservoir and its pipes and connections for looseness, damage, etc.

[HarmonyDella]

There are several spots in the car where water leaks, which are usually caused by sealing issues or drainage blockages. I've driven many cars, and common leak points are around the door edges, roof, and footwell areas. If the door seals age or deform, rainwater can seep inside; if the sunroof drain tubes get clogged with small leaves or dust, water may drip from the sunroof edges; when the AC drain is blocked, water might back up into the footwell. Checking is simple: after rain, see where it's wet, clean the sunroof channels with a soft brush, and if the door seals harden, spray some rubber protectant. For prevention, park away from trees and rinse the drains during car washes. Long-term neglect can damage the interior and increase repair costs.

[McBrynlee]

Last week, my car had water leakage under the seats and on the roof, likely due to clogged sunroof drainage. Modern cars use plastic tubes for drainage which easily accumulate debris, especially after parking under trees. If left untreated, water can damage electronic components like the audio system or fuse box. After each rainfall, I use a flashlight to check the sunroof channels and remove leaf debris to fix it. The AC drain hole is a small opening under the car, easily cleared with a thin rod. This minor issue can be fixed at a shop for a few dozen dollars—avoid DIY disassembly to prevent more problems. Regular attention can save a lot of hassle.

[Jeffrey]

Finding water leakage in the car always worries me about water stains dirtying the floor mats, causing children or the elderly to slip and get injured. Water mostly leaks in from the door edges or roof, often due to poor sealing or aging windshield adhesive. If the air conditioning drain is clogged, water may flow back to the footwell area, which requires more attention. Keep window seals clean and close the sunroof on rainy days. During inspection, check if the rubber seals have become brittle—replace them immediately if any issues are found. This small issue can easily lead to bigger troubles, but regular maintenance can prevent it.