Yes, a 2007 Dodge Ram 3500 diesel has several AC fuses, not just one. They won't be labeled simply "AC Fuse," but rather will protect specific AC components like the compressor, blower motor, etc. You'll find these fuses in both the underhood fuse box and possibly the interior fuse panel (often located under the dashboard).
To find the correct fuses, you'll need to consult your owner's manual. The manual will have a diagram showing the fuse box layouts and indicating which fuses are related to the air conditioning system.
