I have a 2014 5.7 Hemi 1500. Looking for answers to a problem I had today. After traveling from 6k ft to 8500 ft on a 4 to 5% grade, I stopped and shut the truck off for a rest stop. Back out to the truck and found it dumping coolant from the overflow tank siphon tube. Started the truck and the coolant stopped dumping. Looked at temp guage and it was not overheating made it 80+ miles back into town and replace the thermostat.