Why is the car air conditioning pipe leaking water to the co-driver position?

[Monica]

Here is a detailed analysis of the specific reasons for the car air conditioning pipe leaking water to the co-driver position: 1. Poor quality of the drainage pipe: Some drainage pipes are of inferior quality, prone to aging and loosening, causing the pipe to bend and resulting in poor drainage. 2. Loose installation of the air conditioner: If the air conditioner is not installed securely, it may shift over time, causing the drainage pipe to change position and leading to drainage difficulties. 3. Issues with the heat exchanger: Severe dirt accumulation on the filter or a damaged filter can cause the evaporator to deform, preventing water from dripping into the drain pan in time. 4. Insufficient Freon: A lack of Freon in the air conditioning system can cause the indoor unit's evaporator to freeze, preventing water droplets from dripping into the drain pan. 5. Poor material quality of the air conditioner: If the air conditioner is made of subpar materials with an unreasonable internal design, water may not flow into the drain pan and instead leak into the co-driver compartment through the pipes.

[Miller]

I've been driving for almost twenty years and have encountered the issue of water leakage in the passenger side a few times. The most memorable was during a long summer trip last year when, after prolonged use of the AC, my feet suddenly got soaked. Upon inspection, I found a twig blocking the AC drain pipe. The AC absorbs moisture while working, turning it into condensation, which normally drains outside through the pipe. However, since the pipe's outlet is near the passenger side, accumulated dust and debris can cause backflow, flooding the floor and leading to mold. I tried clearing it with a hose but failed, and eventually had to visit a repair shop to get it properly unclogged. Since then, I've made it a habit to clean the AC filter and drain pipe every six months. I also avoid parking under trees to reduce the risk of blockage. This incident reminded me not to slack on maintenance—otherwise, not only do repair costs add up, but dealing with mold inside the car is a real hassle.