I have a 1998 Mack MS200 with the Renault engine, #5600 426-02 on the block. It recently started getting hot on a return trip from Wilkes-Barre Pennsylvania, we live in Knoxville Tennessee. We pulled the radiator and found it flow tested good, but a lot of the cooling fins were corroded away so we replaced with a new one. We also found the electric fans for the cool the A/C coil were bad so we replaced them. We took a trip to Bluffton S.C. last week And the truck ran hot unless we kept it around 1,800 RPM , quite slow going up the mountains. Any Advice as to what might be causing this problem? We thought we would check the thermostat, Anyone know if the water pump impeller could be breaking down , they look to be make of metal in the little bit of info we could find on these engines. Any Advice would be Greatly Appreciated
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