Anyone know what this flap is on HJ47?

[ThatDude]

Does anyone know what this flap/hole is? On my HJ47 ute I hear it flapping open and closed sometimes. I can reach up under the dash and into the hole, there's a metal door/flap inside it..

Trying to eliminate heat coming into the passenger-side footwell and wondering if it has anything to do with it?

Any other tips to eliminate the heat inside the cab would be great too.

 

[bikersmurf]

Fresh/Recirculated Air

 

[ThatDude]

Ah ok thanks. I'm guessing the vents must've been removed on mine years ago then. I have one connected to the top one, that is supposed to go to the heater box, but I feel no heat when I turn it on. Just hear the blower. I only have a Warm/Pull not a fresh/pull knob on the dash, and the selector below it on the side of the heater box

Would that be adding heat from the engine bay by flapping? Maybe I should seal it shut

 

[cbmontgo]

Here's the RHD flipped version of it, just as an FYI.