I have a 2013 ram 1500 4.7 flex fuel truck. I've changed the water pump, thermostat, thermostat housing, radiator, and fan clutch. Filled with coolant and distilled water bled air all the way out. And my truck over heats after driving short distances with the Ac on. It goes up to 250 most times and that chime noise starts in the truck. I've taken it to a dodge dealer and they couldn't figure out why it was still overheating as well.