Lenovo ThinkCentre 3656 Hardware Maintenance Manual page 94

5. Install the new front fan assembly by aligning the rubber mounts of the front fan assembly with the holes
on the chassis and push the rubber mounts through the holes.
6. Pull on the tips of the rubber mounts until the fan assembly is in place.
7. Route the fan cable to the system board and connect the cable to the system board. See "Locating
parts on the system board" on page 71.
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ThinkCentre Hardware Maintenance Manual