VampireHunterC

On my '84, whenever I drive it after it rains, I get a surge of water onto the windshield from just under the hood. Is this normal?

88 WS6 TransAm GTA

iTrader: (1)

No, that is not normal at all. Not sure what could casue it, I would take off your dash pad and see what you can find.
Good luck

okfoz

I am a little confused about your question, Does the water stay outside? Or is it coming in?

John

83CAMAROMAN

i assume its outside and that he wouldn know that inside isnt normal......check the wheel wells..........

okfoz

good point 83camaroman, I could see how if you were missing the plastic inner fenders how you could get splashes up on the windshield thru the fenders. possibly...

John

VampireHunterC

The water is on the outside of the car. It looks kinda like a puddle of water being pushed onto the windshield as the car moves forward, and seems to be coming from the area around where the wipers are.

okfoz

The area right in front of your windshield, between the hood & windshield, is a high pressure area. Look at NASCAR racecars, thats where the air intake is for the engine...

To explain: Let us imagine the airstream that your car is going through is a river. When your car goes forward, and the air that wants to go straight is suddenly forced UP by the windhield you create a pressure area right in frot of your windshield. Because air will try anything to escape, most of which will go up and over the top of your car. All the air that cannot escape upwards is forced down into that little area between your windshield and hood, creating a high pressure area.

That might explain some of what your seeing, as your car goes faster, the water & air is being pushed somewhat into that area, and it could create a puddle looking area.

I attached a sketch to explain SOME of the forces at work on our cars.

John

VampireHunterC

Yes, I understand about that...got that speech a few years ago when I asked my friend's dad why the hood scoop was open at the windshield end of the hood rather than at the front of the car... I am more worried about standing water where there shouldn't be any and future rust problems. This is also after the car has been sitting for awhile in the rain, not as I am going down the road. It only happens when I FIRST start to roll.

VampireHunterC

Ok, ok, my mistake! I took the car out last night after it had been pouring all day and discovered that the water is coming from the cowl induction scoop. Go figure! Anyway, for the time being, the scoop is just for looks. Should I be worried about a lack of drainage under the scoop?