ive read all about people replacing their aux radiator fan brushes, but i havnt seen any details on how its done. how do you get the thing open?

also, is there a simple way on my 124 to get the fans out?

i already bought a new aux fan, but now my other one is out and i really dont want to spend all that money. im pretty sure its the brushes because back before they stopped working completely, i could tap on them to get them to start working again.

thanks

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350