If the fan always draws air in from the outside. I did a test duct taping shut the inlet outside (just under the windshield) with both the button on and off and no air flows. Which leads me to believe the button does absolutely nothing...The air for a/c always comes from the exterior.
A problem when you live in the 3rd world and plumes of smoke surround the car.
A problem when you live in the 3rd world and plumes of smoke surround the car.