[Irfanulla]

Originally Posted by sudharma

The problem appears to be the worn out Carbon brushs of the fan. There is no need to replace the fan. Just replace the brushes.

With so many types of brushless motors available for fan's - why these automobile mfr's use the brush types are so clear. -

[sudharma]

Originally Posted by Irfanulla

With so many types of brushless motors available for fan's - why these automobile mfr's use the brush types are so clear. -

Automobile Brushless Motors are costly to manufacture as the drive electronics has to handle very heavy currents. The normal motors with brushes can handle very heavy currents and cheap to manufacture and maintain.
The cheapest will be the good old engine driven fan at the cost of power loss. The next is the viscous coupled fans driven by the engine.