First of all... let me say... what a pain in the ass to get to the top screw. The bottom aint a lot better.
When you take the glove box off you will see this big green plug. The Blower Resistor is right below it and the big flat fan thing is actually IN the air box through a slit. You will be able to read the writing though as its turned up.
See here is the general location... See the big green plug?
This is it up closer...
You will remove the two screws. Thank god they are not threaded. They are self taping sorts of screws. You will get the top one from the top with some patience and a knuckle (or a flexible shaft extension if you have one) on the end of a 1/4" driver and I think its a 9mm screw head. And the bottom one can be accessed with a ratcheting wrench. Then you have to work it out of there and then get the plug undone. It has one catch on one side. Pretty idiot proof to reinstall. Just be patient as there are many things in the way and the space is real tight.
But... it works. I now have all four speeds. My switch has a bit of a dead spot on highest setting anyway but it works most times.