Kool-a-matic fan replacement

[davidbrady]

What kind of speed control do you have on the Kool-o-matic; i.e., potentiometer, rheostat, solid state, none, etc?

I ask because the speed control should drop the voltage going to the motor and the current going into it. My guess is that the Kool-o-matic uses a rheostat. If so then you should check to see if the rheostat offers resistance at the high speed setting. It could be that the rheostat is the current limiting factor in your motor circuit, in other words, choose a multi-position rheostat that limits the max current to your wiring specifications.