Jump to content


cowl holes necessary?


Recommended Posts

Hey guys,

I've recently sanded and treated some minor rust underneath the cowl in the plenum area where the wiper motor etc. goes and i remember a while back seeing a Custom Z that had a solid cowl (e.g no air induction holes) and i was wondering since this area is prone to rust if it would be a good idea to fill in the holes of my cowl (at least on the driver side and leave the passenger side as is for the heater air intake.)

Would this cause the wiper motor to overheat? I'm trying to figure out why the holes are there other than to gather leaves and wet slush.(even though I've treated with POR I'm still paranoid). Looking for an opinion on this, is it is a bad idea?



Link to comment
Share on other sites

I was paranoid about water dribbling from the drain holes to exit inside the front fender, so I extended the exit holes with 90 degree plastic plumbing bends and some rubber tube the correct size.

It now exits at the bottom of the fender.


Link to comment
Share on other sites

I have wondered about the idea of making a very small 1/2" tall fiberglass dam hidden under the windshield side of the cowl to divert water to the sides instead of letting it run into the wiper motor area in addition to putting a water catcher tray right under the cowl air induction holes. Not sure the idea makes sense but it is an idea anyway.


Link to comment
Share on other sites

I remember someone saying they blocked the air vents in the cowl and still got air into the car okay, hopefully they might see this thread. With the fan on air should be drawn from around the cowl in other areas as there isn't an airtight seal between the cowl and the car body.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.