Using an Expedition, Helming’s Auto Repair demonstrates the function of a blend door in regulating temperature inside a vehicle.
Video Transcript
Alright this is the A/C evaporator cooler
This is the heater cooler
This is a blend door that separates the two so you get your hot or cold air
It goes in that slot there
So you can get either hot or cold or anywhere in between based on how far this door is open