One problem related to engine cooling system has been reported for the 2006 International 7400. The most recently reported issues are listed below.
All of the 2006 International 7400 trucks with the dt 570 engine. That I have in my fleet(4) have blown the block heater out of the engine , dumping up 10 gallons of coolant on the roadway causing a big mess and slippery surface. The highest mileage truck I have is 10162. Mi one of the trucks has done it twice.