After several hot days driving this past summer I decide to try get more ambient air into the cabin. I got an idea from deflectors I used to use while riding motorcycles. A few prototypes, and a few bends in some scrap sheet metal and I have these deflectors that hook onto the mirrors with rare earth magnets and slot into the space beside the window glass. What a difference!

 

Good job ! Necessity is the "mother..." etc.
Just remember to remove them when it starts raining, or bring a bar of soap ! (LOL !)
Edward

 

Hey Alfred, one word comes to mind . . . "Cool!"

Cheers,

Ken