Is it normal for water to leak under the car when the air conditioning is on?

[SanCali]

It is normal for water to leak under the car when the air conditioning is on. Here are the specific reasons for water leakage under the car when the air conditioning is on: 1. Evaporator drainage: Because the car's cooling system has an evaporator installed inside the dashboard, when the air conditioning is on (A/C button ON), the surface temperature of the evaporator is very low, and the moisture in the hot air inside the car will condense on the surface of the evaporator's heat-absorbing fins. The condensed water is collected by the plastic casing of the evaporator and drained out of the car through a pipe. 2. Compressor condensation: Sometimes, the exterior of the compressor (low-pressure area) installed in the engine compartment can condense moisture from the air, causing water to drip onto the ground. 3. Lack of insulation foam: If the low-pressure pipes are not wrapped with insulation foam, the surface of the pipes can easily condense moisture from the air, and water droplets often gather and drip from the lowest point of the pipes.

[BennettLee]

I find it quite normal for a car to leak water when the air conditioning is on. Just like how my home air conditioner drips water, the car's AC removes moisture from the air during cooling, which condenses into water droplets and drains out through the drainage pipe under the chassis. If you notice water stains on the ground after using the AC, there's no need to worry as long as the amount is small—this is based on my years of experience. However, if you observe continuous water flow, unusual odors, or colored water (such as yellow or green), there might be an issue, like a clogged drainage pipe or a leak in the AC system. In such cases, it's best to visit a repair shop promptly to avoid AC malfunctions affecting your driving. I recall one summer when I was stuck in traffic, and the AC leaked a lot of water with a strange odor—it turned out the pipe was clogged, and everything was fine after cleaning. I recommend checking the dripping spot after parking and cleaning the AC filter regularly to prolong its lifespan and ensure a safe drive. Though it may seem minor, this issue relates to both comfort and safety inside the car, so don't overlook it.

[VonPaul]

From the perspective of an older car owner like myself, air conditioning leaks are quite common. When the AC is running, the cold air causes moisture to condense into water droplets that are drained outside the vehicle. If this drainage doesn't occur properly, it can lead to water accumulation and potential issues. If you notice water dripping from the undercarriage while using the AC, it's generally normal and nothing to worry about. However, if the dripping is excessive—forming small puddles continuously—or if the water has a foul odor, you should be cautious. This could indicate a clogged AC drain line or a Freon leak, which can be harmful to health. I recommend that new car owners regularly check the ground beneath their parked cars during hot weather to ensure no debris is blocking the drainage outlet. Regular maintenance of the AC system can prevent problems before they arise, such as having it professionally cleaned every six months. Remember, safe driving isn't just about the engine and tires—paying attention to these small details is equally crucial. Don't wait for major issues to arise before getting your car serviced.

[LeLucas]

From a technical perspective, water leakage when the car's air conditioning is on is a normal physical phenomenon. During operation, the refrigerant absorbs heat from the air, causing moisture to naturally condense into water droplets, which are then discharged through the drain pipe under the car. If there's no leakage, it might indicate a problem, such as a blocked pipe leading to water accumulation and mold. Normal dripping involves a small amount of clear water, but excessive water, discoloration, or unusual odors are signs of abnormality, requiring checks for cracks or system malfunctions. For maintenance, I recommend cleaning the air conditioning filter once a year to prevent blockages. Although small, it plays a crucial role in maintaining a stable in-car environment, so don't take it lightly.