You are missing something...
You CAN run it in there if you wanted to and many many many folks do so. But the only thing in it that actually cools for you is the glycol/water mix, and that's why most users just use water with glycol...cut out the middle man and all the other "stuff" in it. You really don't need antifreeze unless your room is really really cold. Look at water wetter and my favorite, Royal Purple ICE
Folks have been using antifreeze as well, but I don't understand that aspect really. DangerDen and many others stock Zerex Super Coolant
, so I guess thats the Automotive coolant to use. Or you can pick your color. The stuff you get and a VW dealer is blue, so you could use that and have blue water:p