IBM r40 thinkpad fan replacement...

I've had no luck in finding manuals on how to replace the fan, i've successfully dismantled the thinkpad and have removed the fan, but i'm not sure whether it's a simple case of just fitting the new fan, or do you need something between the heatsink and the chip, some kind of heat conductive paste? Sorry if I sound like a noob, haven't had to replace a fan/heatsink before!
 
Thing is, it's not for me, i'm fixing my girlfriends laptop, she's at warwick uni, so i'll be around coventry on saturday when I go to see her...that'll be my first chance to get into town as I work 7-6 most days!
 
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