Intermittent Heater Temp control
 

Heat not working right? You put it on cold and it blows hot or vice versa? Your blend door actuator is likely at fault. So I figured this was common enough on the 2008-10 Superduties to make a video of the temp blend door actuator replacement. It involves pulling some pieces of the dash that many may not be comfortable with, if you follow my video I will walk you through it. Hope this helps!