got a 4400 durstar with mxforce dt. noticed truck would randomly cycle through the vent options with ac controller set to cold and max ac but would blow cold air. now it only goes on heater only no matter the ac controller settings, if i rest body controller it will blow cold air for 5-10 secs then goes to full on heater or tries to mix hot and cold air but mostly hot air.
2011 international 4400 heater only
Discussion in 'Trucks [ Eighteen Wheelers ]' started by truckerbangin, Aug 18, 2021.