⬢Guide the extruder motor cable like in the picture. Leave some slack on the cable below the extruder motor. Leave a slack of about 2-3 cm (0.8 - 1.2 inch) below the extruder motor. This comes in handy for easier disassembly in the future.
⬢Then guide the cable in the "channel" all the way to the back.
The fan has two sides, one has a 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 manner:
⬢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.