My guess is that you're suffering from the classic rear radiator that needs cleaning. The Cat engines have a crankcase vent (slobber tube) that provides an oily mist that gets sucked into the charge air cooler and radiator, thereby attracting all the road dust and debris
Do a search on engine overheating and you'll find more information than you care to know. If it hasn't been cleaned in a while, it might take several cleanings to get it clean.
When you get it clean, be sure to modify the slobber tube (also a search item) so you only have to clean it once a year.
Good luck
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Denny, Connie & Shadow (former barn cat made good)
2000 Itasca Horizon, Cat 3126B, Freightliner Chassis
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