As it has been explained earlier that the fan was a radiator fan and by design these fans are waterproof. Also this exhaust fan prevented the rain from entering the engine compartment due to its high speed. moreover this project was done only to exhaust heat from the engine compartment at slow speeds i.e. in the city or congested road conditions and it was turned off at high speed traveling mainly on the motorway, because of the air draft created in the engine compartment made the hot air exhaust naturally from the hole of this exhaust fan. i have experienced many times rainy storms on the road while traveling and found nothing wrong at all. the pics above show that i have covered the ignition coil by an X-ray of my chest with the help of 2 mounting screws.