Quote Originally Posted by Chevelle View Post
Also you can add a 100 Ohm resistor in series with the 300 ohm resistor in the fan supply. The fan will run slower at idle.

On my 750D the fan settings are either HIGH or LOW. The LOW did not work. HIGH was too loud.

I tried some fixes but no joy. Since there was a lot of room behind it, I mounted a 110v computer "muffin fan" to the air outlet port normally used by the factory fan. Then ran that through a rheostat to control speed.

Now it's dialed in to run at the fastest speed with lowest noise. 750's case doesn't even get warm now.