[bikestuff]

Wait.....gravity? Do they have some sort of axle mounted generator?

This is super intriguing! Since pretty much all cars nowadays have electric fans, sourcing a fan should be no problem....and I bet the current draw would be fairly low. In my coach, I have a honking big oil cooled alternator / generator (what’s the difference anyway?). I bet it has the supply capacity to run a bank of fans.

Also, in terms of cooling efficiency....A round fan and a square radiator? By utilizing a bunch of fans, you could push air through the entire surface making it more efficient.

Also x 2. We have a bank of house batteries that are wasted weight when traveling (other than the refrigerator and occasional microwaved sammich). Why not tie the fans to the house batteries and use them as a kind of low pass filter for the demand.

Is there any restriction on the width of the coach? If we could leave the radiator where it is, and could just move the door out a few inches, it would lower the cost of a retrofit.