Quoted from TheLaw:

Personally I like to go liquid cooled. I take small tuperware containers and use L brackets to attach them to the underside of the PF cradling the coils. I've used water before but it's tough to lift the PF that way so you have to keep a small wet/dry vac handy to suck the water out first. I've been trying a lot of gels that are inside those cooling freezer bags for coolers and such? Not huge success but I'm getting close. I wish I was rich then i would just cut holes in the bottom of the cab and have tiny people stick their heads in and continually blow on the coils to keep them cool. Ha one time they got so hot i had to piss on them to cool them down. Sounds weird i know but it was a real "Red Dawn" moment believe me.