wow, yea.  That is the biggest drawback to a carputer.  When I planned on putting one into my vehicle, I was going to use the glovebox and rig an extra hose off the AC vents into the glovebox.  When its 100 degrees outside, and even hotter in the car, that'll kill a computer...
"Fix it 'til it Breaks."

Jacob - EiC & Director of Technology
Mac Pro Quad 2.66 - 4GB RAM
160 GB SATA RAID 1 - 650 GB Storage
Quad 19" Widescreen LCDs
Accessorized to the Hilt