the service manager said he had talked to some big wig in Detroit who thinks he knows whats going on with the overheating. they have had my truck all week and said they need to drive it while doing some tests. i don't understand what they think this will accomplish being as they are not pulling anything. are they testing for a program or if its chipped or something to blame it on? even with tech 2 in place what do you think they are looking for. i did take a mechanic for a ride last summer pulling a tractor with tech 2 and it verified it was overheating. what do you guys think?