I tried the heat shield, I tried removing the engine cover which people suggest on P1k3 will fix it, and I even removed my one piece windshield. Removing the windshield definetly worked the best but hitting bugs at 50mph and eyes watering the whole time, when I had a windshield in garage wasn't working for me. So I purchased the 4" bilge from amazon and just the little bit of testing ive done with it, im SOOOOO happy an have no idea what took me so long. But the only problem im having is the Heat is coming right up behind the seats where the bed meets. I believe this is because I have the engine cover off or does it do this with it on as well? It moves from air too now wonder the seat gets so hot with how much hot air that's coming out of there. Its really not a concern its not coming back in the cab from what I can tell just when I reach my hand back there or rest my arm across back of seat I can start to feel it.