What Causes Car Leakage During Rain?
3 Answers
What causes car leakage during rain is as follows: 1. The waterproof strips around the doors can easily become misaligned. If rainwater enters the car, check these strips. 2. For loose waterproof strips, reattach them using a specialized adhesive to restore their sealing performance and prevent further leakage. For older cars, also pay attention to the aging of these strips. 3. Leakage around the doors is mostly due to the waterproof strips around them. Check for any cracks or peeling. 4. If part of the waterproof strip is lifted or twisted, rainwater may frequently enter from there. If severely deformed, replacement is necessary. 5. If peeling occurs, reattach it using a waterproof adhesive called sealant, being careful not to pull too hard to avoid damage. 6. If a small part is loose and difficult to reattach, it may be better to peel it off and reattach it to fix any twisting or slackness in the strip. 7. The trunk area also has waterproof strips, which often become tight, twisted, or allow rainwater to enter through gaps.
Last year, I noticed water stains in my car during rainy days. After a long investigation, I found out it was due to the aging rubber seals on the doors, allowing rainwater to seep through the gaps. Especially the small hole at the bottom of the door wasn’t properly covered, so heavy rain would cause water to flow directly inside. Additionally, the sunroof’s drainage channels often got clogged with leaves, causing rainwater to backflow into the headliner and making the interior damp. I recommend cleaning these areas every time you wash your car. If the seals become brittle, replacing them costs just a few dollars—don’t delay until mold starts damaging the car. Also, poorly sealed window rubber strips can leak; I’ve checked multiple times, and cleaning the dust with a small brush works well. Neglecting this long-term can lead to rust on the undercarriage wiring, resulting in higher repair costs, so address it promptly.
Car leaks in rainy days are really annoying. From what I've seen, most cases are caused by cracked door seals letting rain seep in, or clogged sunroof drain tubes overflowing with mud. I've tried fixing it myself - just use a thin wire to clear the drain outlets and dry the rubber seals around the window glass, which helps a lot. Also check for holes in the chassis, especially on older cars prone to aging. Leaks can cause mold growth inside the cabin and dangerous electrical shorts, so it's wise to feel the door seams for moisture before driving. Those who are handy can DIY inspection tools to save money. Additionally, the drainage holes in ventilation systems sometimes get blocked by debris - cleaning them is simple, don't wait until it breaks and costs big money to fix.
