IBM ThinkPad T20 Hardware Maintenance Manual page 97

Removing and replacing a FRU
When installing the fan assembly:
For T20
Remove the protective sheet from the thermal rubber
on the fan assembly.
For T21, T22
Apply the thermal grease (05K5751) on the a -part of
the fan as shown in the following figure.
a
93
ThinkPad T20, T21, T22 and T23 series