Lets all understand that all MFG's including GM designed, tested and built these chassis to operate at or below max GCVW on any public highway, at any time of the year, by anyone WITHOUT running hot or overheating. Those of us with overheating issues have a problem with our MH that need fixing. That means that one or more parts in our MH's are not working correctly, causing our engines to run hot. Some of those things could be: a faulty radiator cap, a plugged radiator core, debris (or any other obstruction) blocking air flow over the radiator, a faulty fan clutch, a faulty thermostat, a missing or improperly installed fan shroud, coolant leaks, collapsing radiator hoses, slipping transmissions, plugged exhaust systems..... and the list goes on and on. Cooling systems are very basic by design. Their job is to remove heat generated by the burning of gas and air that didn't get used to push the piston down the bore or didn't go out the exhaust pipe. In theory, if you have a good water pump, a working thermostat and pressure cap, no leaks, a properly functioning fan system that can move enough air over the radiator to shed the unwanted heat, and a radiator capable of shedding the necessary amount of unwanted heat, you'll have a motorhome capable of doing what its supposed to do, which is not to run hot or overheat when driven normally. We just need to figure out which component(s) are not working as designed, so our motorhomes will run at the designed 215-220 "no matter what" max temps.
On a side note, I found another site where some guys found their fan shrouds fitted with large gaps around the radiator allowing the fan to suck air around the radiator, not thru it. This also tricked the fan clutch into thinking the engine wasn't running hot and would not engage the fan clutch. Its things like this that we have to look for when solving our overheat problem. All of us may not have the same problem causing the overheat, but we all need to evaluate each component of the cooling system to ensure that they are doing their individual jobs as designed. I have read on some forums of guys adding 2nd radiators, multiple electric fans and so on to solve their overheat problems. There are thousands of chassis out there just like ours that don't overheat, we just have to figure out what ours are not doing, that theirs are.
