The blend door on a Ford Ranger isn't a single, easily accessible component like a lightbulb. It's part of the HVAC (Heating, Ventilation, and Air Conditioning) system, located
inside the dashboard, behind the climate control panel. You won't be able to see it or access it without significant disassembly of the dashboard.
To access it, you'd need to remove the dashboard components, likely requiring specialized tools and knowledge of automotive mechanics. It's a job best left to a qualified mechanic unless you have extensive experience with automotive repairs.