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To start, remove the Heat Guard Grills and Main Filter as indicated in this image by the green arrows.
Loosen all four Phillips head screws (red arrows) which hold the fan in place. Hold the fan against the machine when removing the last screw.
Lower the fan, but take care not to stress the wires.
Carefully pull the connector through the back of the machine. Grasp the two halves of the polarized connector and wiggle them while pulling to separate them. As seen here, the connector will only go back together in one way.
When replacing the fan push the wires and connector through the back of the machine, and place the wires as shown here. Be sure not to pinch the wires when replacing the fan. Hold the fan in place, be sure that it is aligned all the way around and that the wires are not pinched, and then loosely replace all for screws before tightening them. Do not over-tighten the screws!