Why Does Water Enter the Passenger Side During Car Washing?
1 Answers
Excluding leaks from car doors, windows, or windshields, there are two main reasons for water accumulation under the passenger seat: First, the drainage outlets at both ends of the U-channel are blocked. During car washing, water sprayed onto the windshield flows down into the U-channel. The air intake for the external circulation mode is located on the right side of the channel, and accumulated water in the channel submerges the intake, allowing water to enter the air duct. Second, the drainage pipe (for air conditioning condensate) at the bottom of the air conditioning evaporator's drip pan is detached or clogged. If water accumulation under the passenger seat occurs only after rain or car washing, the first reason is more likely. If it happens after using the air conditioning without rain or car washing, the second reason is more probable. Solutions: For the first reason, open the U-channel cover, remove any debris or sludge inside, and clear the drainage outlets at both ends. For the second reason, locate the condensate drainage pipe exposed at the bottom outside the car, use an air pump to blow air into it to clear the pipe, and check the connection between the condensate drainage pipe inside the car and the evaporator's drip pan for detachment or aging and cracking of the pipe, and address as needed.
