Why not just run your AC in your car.
, make some venting going from a floor vent and run that to your PC. I did this and it works pretty good. all vents run under neath carpet so you dont even see them. I made the vents from old vaccuum cleaner attachments becaus they were flat and fit on to the vent in my car. Lucky. Water cooling is common, but kind of sucks on a cold day if your cooling your computer. Im in wisconsin and travel south occasionally so I needed it to run off the cars vents. Now that I placed the computer inside the cab of the car, I did away with the venting thing, but it does work good.