I've got a 2014 TV380 with 1400 hrs and have an odd heating/cooling issue. It will idle all day long with no issues and even up to 3/4 throttle but when I go full throttle it heats up almost as fast as I can count and my heat cools off. If I throttle it back it drops almost just as fast and starts blowing warm air. First had a little plastic nipple break on the line going from the thermostat housing to EGR. Replaced that, the thermostat, water pump, flushed radiator and cleaned, ran it without thermostat, checked thermocouple to verify it was accurate. Read 33 degrees touching ice cube and 200 in boiling water that just cooled off. I am not loosing coolant. Oil looks good. No smoke. Does anyone have any ideas? Thank you
