Picking up our New to Us Class A on Friday

When the weather gets hot, don't be alarmed by an large increase in engine noise. The huge thermostatically controlled engine fans on those Workhorse chassis are notoriously loud and can make you think the transmission is doing something weird. I found switching to a 180 degree thermostat (from stock 195) delayed the fan start considerably. Since climbing a hill heats up the engine, having the engine start out at a slightly lower temperature can often mean the fan does not kick in before you reach the summit and once over the top you cool back down to the 180. The Workhorse chassis have such a big radiator that as long as the cooling system is clean and in proper condition, normal operating temperature is determined by the thermostat spec. unless the engine is working hard or the outside air is very hot. In theory, a higher temp stat would provide better mileage and less emissions but I really do not think that it is noticeable at all with a motorhome. BTW, the thermostat is a surprisingly small one compared to the 'average' thermostat.