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Heres the deal guys. I have a 2008 F-350 dually and recently it has been fogging up the windshield. I checked the heater core first and it was good, no leaks held pressure, and no coolant smell in the cab. The next thing I checked was that I had good air flow through the other vents. I had good flow in every position but defrost. Its not a vac leak and I'm thinking it's just a door is stuck somewhere. I pulled the dash apart and replaced that actuator but I'm thinking I maybe just replaced the blend door actuator? Where is the mode selector actuator located? Please help driving me crazy!
Their official ford parts diagrams & with enough probing you should be able to find the diagram with the part location your looking for.
Good luck mate!