Hello everyone! Have not posted in several years thanks to a near perfect Elantra. My 2010 started illuminating intermittently the high temp light last November, no codes, apparent normal running engine temp. and normal heater output. I changed the radiator sending sensor and coolant antifreeze, 11/30/2017 and no more warnings, until yesterday afternoon after a short ride (7 miles) again apparent normal engine compartment temp. normal hot heater output. What should I test next?