Your blower resistor pack is fried. I have the same truck and just had the same problem.

The replacement costs $11.85 from Ma (part # 5174618AA), look for a connector between two 8mm screws under the glovebox, unscrew, take out the old pack, plug in the new one. Super easy fix the dealer would charge you $200 to do.

remember when you said honey, some day that car is gonna look so good in front of our house