air conditioning drains fluids?

[steelhead]

Hi, I notice when i run the AC it really drains my radiator fluids. After extended driving i notice some cold water leaking from the under carraige. I've seen this in 3 of the 4 runners i've driven, 1989, 1994 and 1993 . Is this something normal or something i need to worry about. thanks

 

[BC4Runner]

It shouldn't drain anything from the radiator.

The fluid dripping below is the drain water from the condenser which is completely normal.