I would start by asking my dealer and then try auto electricians or ICE outlets . I would think the wiring will be there so you'll need the switch and relays . I think the parts will be very expensive but good luck .
Chud is dead right on this one, last 3 or 4 cars have done this, first time I saw it had a slight panic as I thought it was oil but after feeling and tasting realised it was just water. After the air con has been running you get frost on the outside of the housing when you stop it melts hence the water