Why is there water leaking under the Corolla?

[XavierAnn]

If it's summer, water leaking from the Corolla is normal behavior—it's condensation water from the air conditioning system. Here are the reasons for the air conditioning system drainage: 1. Lowering the interior temperature: Due to high interior temperatures, the driver needs to activate the cooling system to reduce the cabin temperature. At this time, moisture in the hot air inside the car condenses on the surface of the extremely cold evaporator's heat-absorbing fins. The condensed water droplets are collected by the evaporator's plastic housing and drained out of the vehicle through pipes. 2. Lack of insulation foam wrapping: The low-pressure pipes of the car's air conditioning system are not wrapped with insulation foam, making the pipe surfaces prone to condensing moisture from the air. Water droplets will also condense and accumulate at the lowest point of the pipes before dripping off.