Well for me, the link file were unable to open, but as a guy who like to figure out stuff
I ended up removing the two screws that held the aux fan in the bottom, and also pulling
the entire bumper half way down. But unfortunately I still Not able to see how the aux
fan will come out (It is from the back or coming out from the front bumper??

Otherwise I have similar symptom as described above like Not having enough A/C
when stopping/or car blowing hot air inside. And I went and bought a new fan on ebay.
I set the new aux fan on top of the engine, unplugged the old one while still on the car, plugging the new one in the same plug, now I went to start the car and put the A/C on

After 3second, Boommmmmmm the new Auxiliary fan kicks in while sitting on top of the engine cover. So, this was a good sign showing me that the old culprit wasn't working.
and I plugged the old one back, but the culprit wasn't spinning at all.

Now I just wanted to ensure where the aux fan comes out. front? or back?
(2001 BMW X5 4.4i)