Originally Posted by jjlmn
These is a couple of threads on engine noise from the mechanical cooling fan. I think it's nuts that Toyota put a this in a 2014 vehicle. All about $ I would think , maybe its a reliability thing in extreme environments. Who knows , but I would love to get rid of that roar at start up.
It's still common in the industry to use clutch fans for longitudinally-mounted engines. There is a temperature-controlled fan clutch, so parasitic losses are low. In addition to modern pickups, here's an example of a modern Audi with clutch fan:
Modern BMW engine with clutch fan:
The only real drawback to the clutch fan is less optimal A/C performance at idle. The Audi pictured has a separate condenser fan for this reason.