I was at a show this weekend, and a knowledgeable fellow mustanger pointed out that my a/c expansion valve is bare. He showed me on his car that the expansion valve on the firewall on his car is insulated with this sticky black tape that he called "tire tape". It looked like a big sticky blob of black stuff, sort of like black :nick. I have not noticed this before, but I can say I have looked at many a/c cars. Should this be insulated? If so, with what? If someone has a pic of the valve properly insulated, that would be great.