Join Date: Jun 2003
Location: Springfield, Illinois, USA
It is an interesting idea. Ideally, it would be pure water, but there could be a problem if there were any leaks of oil, etc in your system. It all depends on what components are located close to the condenser coils and the path the water takes out of the AC unit.
There is normally some oil in with the refrigerant to lubricate the compressor. There are also capacitors in an AC unit that may or may not contain oils depending on their type. A good test woould be to put some of the water from the condenser outlet into a bowl. Let it sit overnight to stabilize, and then look at the surface of the water in the bowl. If there is much oil in the water, there will be a tale-tell sheen from the oil slick. To be absolutely certain, you could have a sample analyzed, but that would be fairly expensive.