So I have had my 2005 crew cab fixed several years ago and now the new 05 single cab I just bought has the same problem. The air is cold but will not change to the defrost,floor or other vents. It blows hard but does not come out really anywhere very good. I looked on you tube and have not found a good video yet. Anyone know of a good one that shows how to fix the problem. Money is a little tight and I hate to spend $600 on a repair at the shop.