What is this vent for?

Re: What is this vent for?

Postby chevymaher » July 8th 2020, 12:11pm

On 69 on chevelles they got this vent. I found on a trans am forum they actually tell you what it is for. Air being drawn in the dash blower and being pout in the cabin. It needs a place to go to reduce the interior pressure. They call iot a pressure relief valve in the 78 pontiac service manual.

http://transamcountry.com/community/ind ... #msg500285
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Re: What is this vent for?

Postby AstrofarianAstrofarian is online! » July 8th 2020, 12:55pm

Owner's Manual? Does ANYONE actually READ those things? Next, you'll be telling us to stop and ask for directions when we KNOW where the Hell we're going!
Seriously, though, DON''T block off the vent. WHATEVER reason it was put there, it was done by someone with a lot more engineering degrees than I'll ever have; If moisture behind the panel is a concern, make sure the little drain thingies at the bottom of the panel are open and not plugged with crud!
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Re: What is this vent for?

Postby augidog » July 8th 2020, 3:41pm

I am going to admit, as corny as it is, I wanted an original manual for my glovebox. before my van, I never owned anything later than an '82, so it was in fact quite helpful. I was surprised how comprehensive it is. yes, I have read through it at least once, which is why I vaguely remembered the illustration.

only during discussion like this would the accuracy of a ventilation diagram matter. it sure screwed ME up anyway.

does anyone with an original interior have a pic of these so-called "valves?" I'm curious enough to want to know if there's a flapper or some other feature that makes them something more than a plain vent cover.
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Re: What is this vent for?

Postby MechBob » July 9th 2020, 12:52am

It is a cabin pressure relief valve.It is part of always having ventilation,a safety thing,and so you can close doors without slamming them.Anybody that has ever owned an older car knows about having to slam the doors,when the windows are up.There is usually rubber flaps behind what you see outside, but sometimes just a filter.You can look at some on ebay.I recommend you do not block it off.
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Re: What is this vent for?

Postby augidog » July 9th 2020, 2:10am

hi there, Bob. so, some of these are in fact check-valves. makes sense. aware of cab pressure and ventilation, until this thread I never gave the parts themselves any serious thought.
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