What is the problem with water leakage on the left side of the car?

[JaydenLynn]

Water leakage at the front of the car may be caused by windshield washer fluid or coolant leakage. In the front part of the car, if it's not engine oil, the only two systems with liquids are the windshield washer and coolant systems. Generally, first check the windshield washer pump, pump connections, washer fluid tank, tank connections, and then inspect the pipes. The reasons for water leakage are as follows: 1. The tank is too full: The same applies to coolant. For the tank body, upper and lower tank openings, water pump, pump connections, and pipes, there is an overflow pipe at the coolant tank filler. If the tank is overfilled, when the water temperature rises, it may overflow from the overflow pipe, which is normal. A small trick is to observe the ground where the water is leaking after parking, corresponding to which part of the front of the car is above it. Trace the water marks upwards from the lowest dripping point to easily find the leak. 2. Chassis water leakage: There are generally two possibilities for water leakage from the car chassis: one is exhaust pipe dripping, and the other is air conditioning dripping. Exhaust pipe dripping occurs when the ambient temperature is relatively low, especially in winter, and the car's exhaust pipe drips water outward, which is a very normal phenomenon. Air conditioning dripping happens when the air conditioning is cooling. Due to the evaporation and heat absorption of Freon, the surface temperature of the evaporator is much lower than the "dew point" temperature of the room temperature at that time, causing water vapor in the air to condense into liquid water.

[VanSamantha]

Last week, the floor on the passenger side of my car suddenly got soaked. It turned out the sunroof drain was clogged. When leaves block the drain, water backs up into the car, especially during typhoons. Another possibility is aging or deformed door seals, allowing water to seep directly from the door panel onto the carpet during car washes. By the way, a friend's car had all its AC condensation leak onto the passenger side because a drain hose connector came loose—that spot is particularly hidden. Clearing the drain with an air gun or replacing the seals can fix it. After soaking up the water with a towel, remember to blast the heater for half a day to dry it out, or it will definitely grow mold.

[JohnRose]

The most common cause of water leakage on the front left side is a clogged door drain hole, which I encountered last year. There are drainage outlets designed at the bottom of the door. When leaves or mud block them, accumulated water can seep back into the door panel, soaking the carpet. Water in the spare tire well might be due to cracked sealant around the taillights, which is quite hidden. After rain, check for water under the floor mats and listen for sloshing sounds in the spare tire compartment in the trunk. You can start by using a wire to unclog the drain holes and then vacuum out the water inside the car. If not addressed promptly, it could corrode the wiring. I found my car vacuum cleaner quite effective for this.

[MartinAnn]

A common issue during car repairs is water leakage from the left A-pillar, often caused by cracked sealant on the windshield. Prolonged use of high-pressure water jets during car washes can degrade the sealant, allowing rainwater to seep through gaps. Some cases involve modified wiring leading to compromised firewall sealing. Key areas to inspect include whether the sunroof drain hose has detached and if the rubber grommets near the door hinges are damaged. The most concealed issue I've encountered was a flattened air conditioning drain pipe due to floor mat pressure, causing condensation to pool inside the cabin—drivers could distinctly feel damp, chilled airflow near their left foot when the AC was on.