Electric cooling fan on Class C

gordhog wrote:
Removing the OEM fan takes away a horsepower drain to spin it.

Doing research shows that the OEM fan is controlled by the ECM.

Any suggestions?

Suggestions: Yes, give up.

1) Turning the fan takes horsepower. Whether it comes directly from the end of the crankshaft or indirectly via the alternator makes little difference. The electrical route actually might be a little LESS efficient overall.

2)If the existing mechanical fan is controlled by the ECM, that means it has an electric clutch somewhere.....which is further evidence that you are wasting your time and energy worrying about is since it consumes near ZERO energy when it is free-wheeling.