Air flow in your car is controled by five vacuum "elements" or little push/pull devices. They are controlled by settings on the pushbutton panel. They open and close alternately to distribute air evenly around the interior and specifically target areas like defrost and recirculation. They're a ***** to get to as evidenced by the photo below. But the system won't work without them. The one that went out on mine first was the outside air cutoff. A/C was working it's butt of but could'nt compete with air coming in at 100 degrees. All the elements may not be bad right now, but not replacing them would be foolish.
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