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Old 07-05-2020, 01:36 AM   #1
AcampoDave
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Positive Cab Ventilation

A while ago while in the junkyard, I noticed that more modern pickups have oval shaped air check valves in the back of the cab below the bedline. Apparently, they have some kind of a flapper door to let the incoming air from the ventilation system escape thru a grated cover.
Has anyone ever tried installing these on their classic truck? It seems it would go a long way to improve the air flow of the heater and kick panel vents and I surmise it would reduce the wind noise when cruising with the windows up and vents open.
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Old 07-05-2020, 07:42 AM   #2
The Rocknrod
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Re: Positive Cab Ventilation

Yes about halfway down the page "Rear Cab Air Vents" - https://talk.classicparts.com/thread...p.13928/page-2
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Old 07-05-2020, 09:57 AM   #3
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Re: Positive Cab Ventilation

Vents like that are the reason that vent windows disappeared.
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Old 07-05-2020, 10:47 AM   #4
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Re: Positive Cab Ventilation

I remember the ads from Chevrolet when "Flow-Thru Ventilation" was introduced. The guy talking showed how cigarette smoke was cleared from the car by that flow.
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Old 07-05-2020, 03:56 PM   #5
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Re: Positive Cab Ventilation

Did Chevy begin doing that on the squarebodies?
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Old 07-05-2020, 04:55 PM   #6
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Re: Positive Cab Ventilation

I don't know about the trucks, but the cars got them in '71.

https://www.autoweek.com/car-life/cl...vrolet-impala/
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Old 07-05-2020, 11:57 PM   #7
mike's1965
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Re: Positive Cab Ventilation

My mom had a Grand Am and saw something like what you describe near the frame of rear driver's side door.

On that car I figured it was to let the air push out when shutting door, with window rolled up.

Could this thing you describe be to displace air of a closing door?
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Old 07-06-2020, 12:27 AM   #8
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Re: Positive Cab Ventilation

The squarebody vents out the bottoms of the doors.
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Old 07-06-2020, 01:21 PM   #9
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Re: Positive Cab Ventilation

I used to follow LakeRoadster's build years ago and considered doing the same thing after removing my bed and redoing the wood. I think I ran out of time and never did look at it again. I still have the rear cab vents I removed from a couple of different model trucks.
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Old 07-13-2020, 05:24 PM   #10
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Re: Positive Cab Ventilation

I have thought of doing something like that so that I could close my doors more easily. My doors shut great with the windows down but not as easily will them shut
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Old 01-20-2021, 01:05 PM   #11
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Re: Positive Cab Ventilation

I also noticed when I shut my doors I notice that the roof shakes a lot. I wonder it that is because of the air not having anywhere to go.
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Old 01-20-2021, 01:14 PM   #12
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Re: Positive Cab Ventilation

Quote:
Originally Posted by forestb View Post
I also noticed when I shut my doors I notice that the roof shakes a lot. I wonder it that is because of the air not having anywhere to go.
That could very well be if your cab is sealed up well.
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Old 01-20-2021, 01:33 PM   #13
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Re: Positive Cab Ventilation

I've always been in the habit of opening the door, roll down window a few cranks, enter cab, close door. Depending on the season, roll all the way up, or down.
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Old 01-20-2021, 01:55 PM   #14
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Re: Positive Cab Ventilation

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I've always been in the habit of opening the door, roll down window a few cranks, enter cab, close door. Depending on the season, roll all the way up, or down.
What about when you leave?
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Old 01-20-2021, 02:09 PM   #15
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Re: Positive Cab Ventilation

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What about when you leave?
Same thing, only reversed. My kick panel vents being open probably aid in cab pressure relief.
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Old 01-20-2021, 02:34 PM   #16
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Re: Positive Cab Ventilation

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Same thing, only reversed. My kick panel vents being open probably aid in cab pressure relief.
yah it probably doesn't help that I put speakers where my kick panel vents used to be.
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Old 01-20-2021, 04:56 PM   #17
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Re: Positive Cab Ventilation

The guy that installed my weather stripping on recommended that I leave the section out that runs along the bottom of the door. I wonder if that will help. But then I wonder what problems will run into if I do. Especially wind noise. The only reason I am so concerned is because I keep on having problems with the bondo in the roof cracking.
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Old 01-22-2021, 10:20 AM   #18
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Re: Positive Cab Ventilation

I did this years ago to get the doors to close like a modern vehicle. See this post in my build thread: https://67-72chevytrucks.com/vboard/...&postcount=645
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Old 01-22-2021, 12:47 PM   #19
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Re: Positive Cab Ventilation

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Originally Posted by racecougar View Post
I did this years ago to get the doors to close like a modern vehicle. See this post in my build thread: https://67-72chevytrucks.com/vboard/...&postcount=645
Good Idea. If only I didn't have my speakers located there.
I don't think it would work to put them in the door jams sense the gasket is on the inside of the jamb.
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Old 01-22-2021, 12:50 PM   #20
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Re: Positive Cab Ventilation

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Good Idea. If only I didn't have my speakers located there.
I don't think it would work to put them in the door jams sense the gasket is on the inside of the jamb.
If you place the vents in the rear door jamb, outside of the weatherstrip, it absolutely will work. Take a look at many vehicles from the '60's and '70's; that's a common location for the relief vent.

I didn't go that route, as that is where my speakers are hidden.
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Old 01-22-2021, 12:54 PM   #21
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Re: Positive Cab Ventilation

Got it. I was thinking of it backwards. So that the air would be pushed inside the cab.
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Old 01-23-2021, 02:18 PM   #22
forestb
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Re: Positive Cab Ventilation

I think I need to install something like this or else the bondo in my roof will continue cracking. I can see the roof shake every time I shut the door with the windows up
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