I have an 07 ram 1500 and I've been having some problems with the AC/heat blower. Once I turn the AC/heat on, it blows from the front vents only. It will not let me switch to any other position. What's worse is that after driving for awhile, it stops blowing out the front vents. I can still hear it blowing, it's just not coming out of ANY vents. If I turn it off for a while and then turn it back on, it will blow out of the front vents for a while, but will stop again. It's an endless cycle and very frustrating. I'm trying to avoid the dealership and I feel like I can probably fix it myself, just need to know what to fix. Any help is very much appreciated. Thanks in advance.