I posted this before and did try what was suggested...didn't work...my problem is when I have everything shut off as far as vents , a/c , heat , fan off ., I still get air coming thru the vents ,as I drive,,,it comes thru the dash vents or defrost or floor...something doesn't seem like it's closing off the outside air flowing into the car....any more ideas ? thank guys

 

You will get a certain amount of air into the cabin being recycled through the cabin filter shuting off outside air,that is natural for proper circulation.