What Causes Water Dripping Under the Car in Summer?

1 Answers
RosalieAnn
07/30/25 8:45am
Dripping water under the car in summer is a normal phenomenon due to the complete combustion of fuel in the engine. Below are the specific reasons for water leakage under the car: 1. Evaporator drainage: 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 in the hot air inside the car to condense on the heat-absorbing fins of the evaporator. The condensed water is collected by the plastic housing of the evaporator and drained out of the car through a pipe. 2. Uninsulated low-pressure pipes: If the low-pressure pipes are not wrapped with insulation foam, the surface of the pipes can easily condense moisture from the air, causing water droplets to form and drip from the lowest point of the pipes.
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