Went on a 250 mile cruise/car show today with temps in low 90's. Running a 350/290hp chevy motor with Griffin rad with Spal fan. Heat from fan seems to be hitting my fire wall and after a while, heat seems to just boil from under dash, yeah it's insulated but not with the real good stuff. It's working my A/C hard as thats where it gets the air to cool me. Over dinner a buddy suggested an "air dam" to suck the hot air out under the car. Will this idea work? Thanks