As i've posted before we have been having troubles with the engine overheating since the first trip we took in the motorhome. Took it to Freightliner twice under warranty and nothing found. Took it ...
Scott, It's a viscous coupled fan clutch. That's the problem, the oil leaked out of the clutch and it wouldn't engage the fan when the motor was hot. Apparently any of the Frieghtliner chassis with the cummins engine from 07 on have this type of set up.