Quote:
Originally Posted by lowriderdog37
I really don't understand the purpose of the main air valve. Doesn't the recirc valve control if you get outside air in the system?
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You are correct. The fresh/recirc flap controls whether or not fresh air enters the system.
The main flap is open whenever the cc is on ( any of the 4 left buttons ), and closed when it's off. My guess is that it's purpose is to keep the moldy smell of the evaporator core from entering the cabin. When the system is on, the core and cabin have air passing through them, so the smell is dissipated after a few seconds.
