Outside Air

Hello, i have an 1999 chevy malibu. When the a/c is off and i am going highway speed, the car does not flow outside air through the vents like it is supposed to...i recently cleaned the climate control unit also....any help?
Thanks!!!

See I always wonder way whe the ac is off why do i still feel air coming out the vents

Sometimes in my 99 Malibu I hear a click click click coming from the heater control areas. I notice that the little green lights on the "air flow through" and the "circulate interior air" control knobs flash, in time with the clicking. This tells me that somehow, the controls are flipping all by themselves. Eventually, I suppose, the circuitry will deteriorate further. That may be your problem too.

Well, Mine only stays on the one that has the arrow straight in other word the one that lets only air come in and even if it off i still feel air coming in.

well, thats the outside air...and when i turn the a/c off, i dont feel any air coming out....any help??

The weird part is if the ac is off and I push the circular button the air that comes in now feels cold I wonder why.