Now that the heat of summer is upon me, I've noticed that the vents blow hot air all the time (unless I'm running the A/C, of course). It's noticeably hotter than the outside air temp. Seems like heat soak from the engine compartment, because it's not bad when I pull out of the garage in the morning, but it gets hotter as I drive. Once the sun heats up the car, all I get is hot air. I hate running the A/C, but sometimes I wuss out and use it anyway.
Has anyone had any luck fabricating a heat shield or insulating the intake plenum for the cabin vents? Maybe a sheet of asbestos or some header wrap in strategic places will help me out.