I have a cracked/damaged cowl vent on my car. Where would I go to replace it?

A cowl vent is usually a vent on hood. Without knowing what you're driving hard to offer anything else. email me if need be. Ok looked at picture that's the cowl that lets water run off windshield and also air intake for heat. If broken or cracked will let leaves etc. into heater and block drains that let water rain. It will be a dealer item and will have to be ordered. It's not a normal maintenance item.