IBM ThinkPad A21m Hardware Maintenance Manual page 90

Removing and replacing a FRU
Installation notice for A21m/p and A22m/p series
When installing the fan assembly, apply the thermal grease
(05K5751) on the a -part of the fan as shown in the
following figure.
84
ThinkPad A20m/p, A21m/p, A22m/p