by Jonker » Mon Aug 27, 2007 6:19 pm
Drivers do not generally have to endure the same heat. They usually have a separate ventillation and on occasion air conditioning system in their cab, which with all the security screens these days makes for a pretty selcuded environment.
Passenger saloon heating on more modern/advanced buses can have solenoid valves also as the original engine bay gate valves, so the driver can turn the heating off.
Bus engines don't overheat if the saloon heating isn't used there's something else wrong with the car.