How to drain ac overflow

The drain tube is plugged. Look under the hood on the passenger side of the firewall for a rubber tube hanging down, typically about 4" long. Squeeze the end to open it up to see if anything will dislodge and water comes pouring out. It not, you'll have to remove that tube and stick something into the drain to clear it.

A zillion thanks for this valuable tip: After weeks of sodden carpet in in my 2009 CRV passenger side foot space alternating with driving in 100-degree temperatures when ...i turned off the a/c to stop the leaking, I took the problem to my trusty mechanic to diagnose. He diagnosed a leak in the heater core and estimated the labor alone to replace this would be above $800. After hours searching for possible solutions online, I stumbled on these two both suggesting the same cause. 2 minutes on my back under my car, the a/c drain hose was plainly visible as was its final 3 inches twisted back on itself, preventing any downward flow inside the hose. Pulled it down to straighten it out, and more than half gallon of water gushed out! No more saturated carpeting, no $00 bill, & an a/c system that seems to be operating at temperatures at least 20 degrees F cooler than it had before the drain hose was cleared.

Happy to hear you solved this. A properly functioning AC system is only expected to lower air temperature roughly 20 degrees. It's the removal of the humidity that produces the comfort. The humidity condenses on the evaporator in the dash, just like it does on a cold milk jug or soda can on a humid day. That condensation collects in a pan under the evaporator, then runs onto the ground. Plugged drain tubes are fairly common. Usually it's leaves and other debris that has found its way in. Sometimes that rubber tube has to be removed to get access to the blockage. There's usually a wire ring around the tube to squeeze, then it can be pulled off.

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