I tried but could not find a WW Grainger equivalent to the DC motors in the Webasto heat exchangers used on Liberty coaches.

But I did find a link to the site of the heat exchanger manufacturer.

http://www.rdac.com/index.html

I tried unsuccessfully to download the parts catalog. Maybe a computer literate POGGER could do that, but there are numerous distributors that will sell not only the motors, but all the parts.

Personally, I would like to order the heat exchangers without the noise option. I'm like Roger, in that I would run my Webasto more frequently, but I have to be hard up to want to tolerate the noise. I may go down to GA (wasn't that a song title?) and steal Tom's as long as he wants to rub our noses in his quiet Marathon system.