I personally think that gov't entities that own/operate parks should have paid staff in key supervisory position(s) and utilize workcampers only to supplement that staff. It is too bad that the current office manager and her husband are rude and not helpful, but switching over to workcampers exclusively in no way assures success. Workcampers definitely require effective management and supervision, just as paid employees do.
It sounds like the park district manager needs to deal with the problem employees directly, and then consider workcampers or volunteers as a way to supplement the workforce, not replace it.
All three of our smarts have exhibited the same behavior in stopped traffic.
The thing to keep in mind is that in the US the AC is designed to keep the interior of the car cool. In Europe it is designed to keep the interior from becoming too hot! May be tongue in cheek, but as I recall my old Saab and both of my Jaguar XJS's ('86 & '90) were the same way.