My side mount hydraulic fan runs via the power steering pump, the rear rad type still has the same pump that runs the power steering, my opinion is both will be reliable, they just use the side rad for more room for the engine, also a side rad willl stay cleaner. 
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Keith, Krista and Family
77 38' Newell Coach Repowered from Smokin' V555TA To 325hp 8.3 inline 6 cummins, Allison 3000 series trans
87 40' Newell Coach 475hp 8V92 DD(sold)
22' 350hp Jet Riverboat
79 Ford F250 4x4
Many others to list
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