Where is located?

Click on Tech Info at the top and go to SL class. Scroll down until you come to blower motor replacement. If your motor isn't blowing the bearings may just be dry. Use a long narrow snout applicator(I got mine from a sewing machine repair shop) to oil the bearings rotating the fan by hand. Hook it up to a 12v battery on the bench to see if you have solved the problem. I did this on my 300SD five years ago and it is still working perfectly.