Ahh - like the red and black could be one speed, and the green and yellow another, and power to both circuits would be a third? I found a link to directions for hooking up a cooling fan motor with all the same color wires. It had said to hook up the red to your A/C compressor wire, so the cooling fan would be on when the compressor was on. The other two wires would be hooked to a switch on the dash for auxiliary cooling as needed.(or could be connected to temp. sensitive switch for the same reason)
