I'm an "old iron" owner. First coach was an '84 Blue Bird FC35. Because I bought during winter, I never heard the electrically-operated radiator fan kick on. I figured it just ran like my car's fan did on an engine-driven fan belt. Further, I didn't really understand the manual override switch on the dash that kept the fan running constantly, if desired.
The bottom line is..the wire powering that radiator fan was broken. We didn't overheat seriously until we were on highway 385 going up two lane switch-back roads through Custer National Park on our way up to Mt. Rushmore. It was incredibly difficult to find a place to pull over..and a very dangerous tow off the mountain.
Moral is...make sure EVERY component and accessory is demonstrated in working order when you take delivery of a new or used coach..even if that accessory may not be necessary at the time.
Currently driving an '86 Newell we thoroughly enjoy..no breakdowns in the last 2-3 years. But thanks to an alert mechanic who noticed by u-joint was about shot just before a 4,000 mile trip.