If you want to search my (DanielW) posts on 300E blower, You might be able to lube the bearings on the fan and even replace the brushes if they are more than half worn down. I really don't know if many people have long term success with that sort of thing --- but I was able to do both repair jobs on an 87' 300E by using laquer thinner which had assembly lube disolved in it. Also created some new brushes from an alternator brush set which was a small amount larger than the stock ones. Brush carbon material sands down really easily and you solder on your wires from the old set. My total cost was $2.00 and about 4 hours tinkering time. Good Luck to you, DanielW