Well the fan in my 91 Accord for the ventilation (heater, AC) stopped
working (it been a little noisy lately, now its just dead). Is it expensive
to get fixed? Also, I must say I'm pretty ignorant, I opened the hood and
noticed that the 2 big radiator fans between the engine block and the
radiator were not running, are those thing supposed to be running all the
time or just when the engine get hot? (weather is rather cool these days)
and is it related with the ventilation inside the car?

thanks!