Im kind of running into heat problems also. Heres what ive done to combat future problems.
1.) added an extra fan
2.) improved circulation
3.) bought a winshield shade from Pep Boys (this is supposed to reduce overall car temp up to 50 deg., and i almost believe it!)
4.) Cracked the window when possible.
5.) Park in the shade whenever possible
Other things that might help.
- Run cpu idle software (i cant think of any off the top of my head)
- Get some thermal paste for the cpu (Arctic Siver is the best stuff, but expensive...this will help provide a better contact between the cpu and fan which improves cooling)
Im sure theres some more things you can think of, and im sure the rest of the board can help also.