Asus V4-M3A3200 - Manual (Page 29)

2-9 ASUS V4-M3A3200
3. Align the other end of the retention bracket (near the retention bracket lock)
to the retention module base. A clicking sound denotes that the retention
bracket is in place.
Make sure that the fan and heatsink assembly perfectly fits the retention
mechanism module base, otherwise you cannot snap the retention bracket in
place.
4. Push down the retention bracket lock on the retention mechanism to secure
the heatsink and fan to the module base.
5. When the fan and heatsink assembly is in place, connect the CPU fan cable
to the connector on the motherboard labeled CPU_FAN.
Do not forget to connect the CPU fan connector! Hardware monitoring errors
can occur if you fail to plug this connector.