3.Push down the locks on the retention mechanism to secure the heatsink and fan to the module base.
When secure, the retention locks should point to opposite directions.
2.4.4 Connecting the CPU fan cable
When the fan, heatsink, and the retention mechanism are in place, connect the CPU fan cable to the connector on the motherboard labeled CPU_FAN.
CPU Fan Connector (CPU_FAN)
Don’t forget to connect the CPU fan connector! Hardware monitoring errors may occur if you fail to plug this connector.