Ok I have a 2004 Dodge Ram 1500 QCSB 4x4 with the 4.7. My ac was working fine and then no matter what speed it was on it would just stop blowing. Then in a few minutes it would work again. Then stop again and now it won;t blow at all. My compressor clicks on and runs fine. I pulled the blower motor and tested it and it works fine. I changed the blower motor resistor and it still won;t work. The fuses and relays all check out. So i'm thinking that it is either the control switch in the cab or it is in the ignition where the blower draws power from. What do yall think?

 

Also i'm not getting any voltage to the resistor or the blower motor.

 

So maybe it is the ign switch after all being that is where all the accessory wires get power from

 

I had the exact same problem yesterday but then i turned the truck on then back on again and now it works fine. Mine would only blow on high then if you turned it down any it would shut itself off.