I own a 1999 international truck with a dt466 engine. This engine has been great until 1 yr ago. it has been running very hot at highway speeds (210+) when temperatures are 60+ degrees outside. my local dealer rebuilt the radiator last year but the problem continues. when the truck was new, i used to hear the fan kick in and the temp went down to a respectable range. I no longer hear this sound. so far, the dealer and another repair shop say there is nothing wrong with the fan. i'm concerned because summer is coming and i cant have this overheating keeping me off the road....
any suggestions?
thanks,
tim buehler