That's what I've noticed about them the two times I had a codriver. They overheat so damn easily and even with icewater we were having issues. I codrove with the same person the prior year once on victoracers and it wasn't that big a deal. Perhaps I do need to spray them at single driver events.
I got the covers at P&G Chevrolet www.partszoneonline.com I think $4.32 each or something. They're a tad more than GM Partsdirect, but they charge you real shipping rates and you can call up and talk to a real person if you have a problem. I also have a new dash panel on the way mine developed an 8" crack. (IMG:
http://www.frrax.com/rrforum/style_emoticons/default/dry.gif) I'm going to try bondo and paint on my old one to fix the crack and use flat black plastic paint to cut down on glare.