What Causes Water Leakage Under the Car?

[EverlyRose]

Water dripping from the underside of the car onto the ground is a normal phenomenon. There are several reasons for this: 1. The car's air conditioning system is equipped with an evaporator inside the dashboard. When the air conditioning is turned on (A/C button ON), the surface temperature of the evaporator becomes very low, causing moisture from the hot air inside the car to condense on the heat-absorbing fins of the evaporator. The condensed water is then collected by the plastic casing of the evaporator and drained out of the car through a pipe. If the car is parked for a while, you might notice a puddle of clean, colorless, and transparent water, which is not a cause for concern as the engine coolant is usually antifreeze (green, red, or blue). 2. The compressor located in the engine compartment (low-pressure area) can also condense moisture from the air, causing water to drip onto the ground (sometimes in larger quantities than the evaporator's drainage). 3. If the low-pressure pipes are not wrapped with insulating foam, the surface of the pipes can easily condense moisture from the air, and water droplets often accumulate and drip from the lowest point of the pipes.