* When you read the microfilter replacement guide, the OP says:
"The service manual says to remove the two microfilters, frames and all. I found it easier to leave the frames in place."
I removed these frames because it is easier to reach the 4 t-20 screws that hold the blower housing cover in place. There is one in what is more or less each corner.
Once you have the 4 screws removed you can juggle the cover around to remove the 3 clips that hold the 2 sections together with a screwdriver.
Blower cover housing showing clips:
When you have the cover separated it comes out in 2 parts, and they can be jiggled out on the right hand (passenger) side of the car (unless you are in the UK, Japan, NZ or AUS)
Once the cover is off and out, remove the electric connections and use a pair of pliers or whatever is handy to pop the clip up that holds the blower in place:
*this pic is borrowed from
http://www.sqbimmer.com/dump/e36_blower_motor/ The clip is the exact same one in the 318ti.
Now install is the reverse of removal!
Hope this helps everyone!