[lunarhighway]

what you have to remember is that the grill is there for a reason, so adding a little opening is no sin, you could have a little manual shutter for these occasions or leave a small opening all the time... this could actually be enough to allow the fan to controle the situation, and if this situation don't occur very often, the fan is a good and safe solution.

i only tend to build up heat when stuck in stop go traffic and barely moving, as soon as i pick up a little speed the small hole i left is enough to bring things down to normal levels.

also if you overheat at low speeds where the ram effect trough the grill is small, so a hole anywhere (ie the bottom in front the the rad) where the fan can collect fresh air might work.