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Re: What is the purpose of the cowl vent?
Assuming you are talking the screen covered area just in front of the windshield, that is the air intake for the heater / AC /vents. It is protected from engine fumes by a seal along the hood, is big enough so rain settles out instead of going though the blower, and is a good place to hide washer hoses etc.
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1987 2 ton 
1982 250/TH350 beater in progress
Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping
Plus a mess o' tractors
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