Where is the heater blend door on a 1995 Ford Ranger 4-cylinder manual with AC?

The heater blend door on a 1995 Ford Ranger 4-cylinder with AC is located inside the dashboard, behind the glove box. It's not easily accessible without removing parts of the dashboard. You'll need to take the glove box out at minimum, and possibly more surrounding trim pieces depending on how comfortable you are with disassembly.

Important Note: Accessing and repairing the blend door is a fairly involved process. It's not a simple job for someone without mechanical experience. Broken blend doors often require replacement, and those parts can be tricky to find. Consider the cost of parts and labor versus simply living with the issue before you attempt the repair.