I have an 02' F150 5.4L and the other day i had the heat on for a while when i was driving and all of a sudden it started to blow cold air. I shut the fan off and tried moving the switches all around but it didnt do anything. I eventually shut the truck off and tried it again after restarting it but it still was blowing cold air. I checked the fuses but they were all fine. I didnt know if any one has had this problem before and maybe how to fix it. I am going to try the get a temperature control switch on the dash panel first but i dont know if thats the problem. So if anyone could help me out that would be great. I live in NH and i need heat!!