Shocker73

Thanks a lot Turkster, it was the harness pins not making a good connection. The head tech was back today and checked back over the others work and found it.

Ok guys, I've posted this elsewhere with no luck so far. Maybe someone on here has had this problem and knows a fix. Original: 2014 Mack CHU Pinnacle w/mp8. Any idea what would cause the fan to stay on continuously? Just started today loaded, empty, sitting still with a/c on or off. This trucks fan runs in high stage more than any other truck I've ever driven but never in high stage all day. Any ideas? Today Update: The truck has been at the dealership all week. The computer told them it was the clutch fan so they replaced it. Still runs continuously on high. They ran several computer test on all sensors and electrical and can't find the problem. The last thing they tried was hooking up another ECM (I think) but still no change. This is a Mack service center so I'm sure they check the most probable causes maybe its something unusual that they wouldn't think of. Have any of you had or heard of this problem, if so please give me some insight. Thanks

I've been browsing the internet looking for info about a problem with my Mack and came across this site. Posted a question in (Engine and Transmission) maybe someone has some ideas. Thanks