Should you leave an air conditioner spitting water on or off?

An air conditioner that is spitting probably has a blockage in its drainage. Because colder air cannot hold as much water as warmer air, air conditioning causes water to condense out of the air. Algae thrives in the drainage of the condensation, and a colony of algae can grow to the point that the drainage is blocked. To prevent that, pour a cup of bleach into the drainage every month or two. If the condensation drains through a tube or pipe, such a blockage can be easily blown out (just don't touch your lips directly to the tube or pipe).