I changed the oil a week or so ago. I keep cardboard under the engine to check for leaks and to use it to kneel on while working under the car. Yesterday I noticed some spots and thought I didn't tighten the oil plug enough so I slightly tightened it and rearranged the cardboard to the "clean side". This morning I noticed some spots but it wasn't under the oil plug. SO I checked it out this evening. I notice drops hanging on to pieces on the driver's side that were green in color. I thought it might be anti-freeze but as I traced it upward, it looks like it was originating from the underside of the AC compressor, toward the rear of the car. I checked the water hoses in the area and the overflow tank but they all look good. What could be leaking from the AC compressor? The R134 is gas and wouldn't come out as a fluid could it? I cleaned everything up so I'll see if it's still leaking in the morning.