The fan has two sides, one has a Noctua sticker. Make sure, this side is facing inside the extruder.
⬢First, create a loop on the cable. Make sure the black protective wrap is close to the edge of the fan. See the picture.
⬢Place the fan on the extruder and proceed in the following way:
⬢Start by placing the fan's cable in the upper channel
⬢Slide the fan close to the X-carriage and GENTLY PUSH the cable in using an Allen key. Before you push the fan all the way to the left, place the cable in the X-carriage channel.
FINAL CHECK! The fan is oriented with the cable facing up, then the cable goes through the upper channel all the way to the X-carriage. In the X-carriage don't forget to use both channels. Make sure the CABLE ISN'T PINCHED along the way!