There is a fan behind the unit. Mine will cycle on and off periodically. I assume this is to help circulate air through the coils. On my old popup I actually installed a 12 volt computer fan to do the same thing. It's frig had a really hard time maintaining temperature when camping in 90+ temps. My Roo's frig works great though even in hot temps, although I have thought about installing a switch for its fan so I can turn it off when dry camping to conserve a few amps. Don't know if this would screw up the frig's electronics or not though.
Michael, Cristina, Anthony, Cocoa Puff, Cookie, Blossom, Tosca, & Heidi
2012 Rockwood Roo 21SS