IBM 6151 Maintenance And Service Manual page 448

Cooling Fan Assembly Removal
1.
Do the "Top Cover Removal" on page 4-12.
2. Remove the fixed-disk and diskette adapter from slot 6 and
place it on top of the system unit with the cables attached.
3. Disconnect the cooling fan power cable.
4. Pull the fan mounting latches toward the front; then lift up on
the cooling fan assembly.
Cooling Fan
Mounting Latches
Cooling Fan Power Connector
AJZBF018
4-38 Service Manual