Hey, I try.

 

Remove the moldings and the winshield... drill out the welds with a Uni-bit. Fit the new lower cowl in, weld, paint with POR15, reinstall top half. Not really that hard to do.

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That is too funny. Looks like my Weber in the backyard! Throw some brats on that cowl!!! LOL

 

I soaked the heck out of all the crud over a couple days and then pulled the bolts from the paasenger side fender(bottom) and flushed them out that way and used piecies of cardboard to help sweep them along and to gettem out to the fender,,, you call all so pull the heater box in advance and "sweep" them with a picec of carboard to the passenger side vent area and reach up there with your hand and gett quite abit of crud out before soaking whats left,,,was kinda pain in the rear end but it worked and it beats paying someone help the big bucks to get the same result,,,good luck hope it helps

 

what is the actuall function of the cowl?

 

It's what directs the air into the heater box. It has to be designed to keep waterout and only air coming into your car.
ford just had a bad design when it came to routing the water out the cowl and back onto the ground. that and they didn't do anything to protect the metal from rusting.