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Is there an air filter under the dash on the inside....maybe behind Glove compartment? I noticed that when I set air conditioner dial to bring air in from outside there is more volume than inside circulation. ......
 

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Is there an air filter under the dash on the inside....maybe behind Glove compartment? I noticed that when I set air conditioner dial to bring air in from outside there is more volume than inside circulation. ......
The blower has a much larger intake when supplied with outside air. Recirc uses the floor vents and defrost as return air ducts.
 

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The blower has a much larger intake when supplied with outside air. Recirc uses the floor vents and defrost as return air ducts.
Plus the outside air is being forced in, the faster you drive the more force.
 
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