I park my car outside in the summer time. I would like to leave the window slightly down. It keeps the car cooler. I don't want rain water getting into my car. Has anyone found a commercial drip guard or made a drip guard for our coupes?

 

Yes I have one on mine that looks like factory install. I put it on about 8 years ago and it is as good as the day I installed. Give me a day to dig out the paper work. It works on the coupe only.

 

Try this : Drip rail
It will come in a coil, just lay it out straight a few days someplace warm and it will straighten out which makes it easier to install.Use the 5/8" size. Mine runs in one continues strip from the bottom of the windshield to the rear of the quarter window. I may have used a hair drier to make the bend from windshield A pillar to roof. If the wind gets to blowing rain can still make it inside, but it wont be too much.