Why is water dripping under my car when the AC is on?

Clear, odorless water puddling under the middle of the car after you park with the AC running is completely normal — that's cabin humidity condensing on the evaporator and draining out through a tube by design. On a humid day a car can drip a quart an hour. Worry only if the fluid is coloured or slick: green or orange and sweet-smelling is coolant, reddish is transmission fluid, brown and oily is engine oil. And if the water shows up on the passenger carpet instead of the pavement, the drain tube is plugged.

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