Astro Ventilation - CorvetteForum - Chevrolet Corvette Forum Discussion


C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Astro Ventilation

Reply
 
 
 
Thread Tools Search this Thread
Old 09-03-2003, 11:10 AM   #1
GATOR454
CF Senior Member
Thread Starter
 
GATOR454's Avatar
 
Member Since: Aug 2003
Location: Cary North Carolina
Posts: 658
Thanks: 0
Thanked 0 Times in 0 Posts
Default Astro Ventilation

I finally got the Corvette I've been waiting for for nearly 30 years. So I am new to Corvette ownership and this forum. The corvette that I got is a nearly unmolested '74 454 coupe that was in storage for years and only has 67,000 miles on it.

The only thing that appears to be missing is the Astro Ventilation plenum. The underside of the vents were closed off with a painted piece of aluminum.

My question is, Does it work well enough to go through the trouble to track down the pieces and reinstall the system?

I was also thinking of fabricating a custom plenum and attaching a computer base fan that would be run off of a photocell mounted on the back deck to ventilate the interior when it is parked in the sun.
GATOR454 is offline   Reply With Quote
Old 09-03-2003, 11:30 AM   #2
Martin72
CF Senior Member
 
Martin72's Avatar
 
Member Since: Mar 2002
Location: Conyers GA
Posts: 238
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Astro Ventilation (GATOR454)

Does the car have a/c....if so, the vents are blocked...
Martin72 is offline   Reply With Quote
Old 09-03-2003, 11:31 AM   #3
bcliff
CF Member
 
bcliff's Avatar
 
Member Since: Aug 2002
Location: PA
Posts: 64
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Astro Ventilation (GATOR454)

Does the car have a/c? If so, the plates in the back are original, astro ventilation was not operative with a/c.
bcliff is offline   Reply With Quote
Old 09-03-2003, 11:32 AM   #4
GATOR454
CF Senior Member
Thread Starter
 
GATOR454's Avatar
 
Member Since: Aug 2003
Location: Cary North Carolina
Posts: 658
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Astro Ventilation (Martin72)

Yes, it has A/C. Does that mean it didn't come with one? If so, why did they print Astro Ventilation on the windows?
GATOR454 is offline   Reply With Quote
Old 09-03-2003, 11:39 AM   #5
bcliff
CF Member
 
bcliff's Avatar
 
Member Since: Aug 2002
Location: PA
Posts: 64
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Astro Ventilation (GATOR454)

GM probably just had all side windows with the astro ventilation script on them even though A/C cars do not actually have it.
bcliff is offline   Reply With Quote
Old 09-03-2003, 11:51 AM   #6
Martin72
CF Senior Member
 
Martin72's Avatar
 
Member Since: Mar 2002
Location: Conyers GA
Posts: 238
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Astro Ventilation (bcliff)

You would think that they would have installed the parts on all the cars....and have the vents open on an a/c car when the control was set to vent...but noooo.....only on non a/c cars.
Martin72 is offline   Reply With Quote
Old 09-03-2003, 12:03 PM   #7
tjl5709
CF Senior Member
 
tjl5709's Avatar
 
Member Since: Jul 2003
Location: Ann Arbor MI
Posts: 623
Thanks: 0
Thanked 5 Times in 3 Posts
Default Re: Astro Ventilation (Martin72)

Can they be converted?
tjl5709 is offline   Reply With Quote
Old 09-03-2003, 01:25 PM   #8
Wrencher
CF Senior Member
 
Wrencher's Avatar
 
Member Since: Oct 1999
Location: NorCal
Posts: 4,026
Thanks: 0
Thanked 2 Times in 2 Posts
Default Re: Astro Ventilation (tjl5709)

There are some vacuum parts and/or cables involved, so it would be a challenge to incorporate on an A/C car. I'm considering some sort of door arrangement that would be operated manually.

I tested the whole idea by removing the two plates and found a couple of problems that may only apply to convertibles. First, you need lots of air volume out of the vents to create enough positive pressure in the cabin to overcome the high pressure area right behind the top. Second, all the seals on the top have to be PERFECT to allow the cabin to pressurize.

Basically on mine, it just sucks in warm air (we're talking hot right now) once I start moving. On a coupe, the area behind the rear glass might be low pressure and it would work better. I used small streamers hanging down over the openings to check airflow in or out.

Hans
Wrencher is offline   Reply With Quote
Old 09-03-2003, 11:35 PM   #9
trw
CF Senior Member
 
trw's Avatar
 
Member Since: May 2000
Location: Crescent City, CA
Posts: 2,125
Thanks: 0
Thanked 5 Times in 4 Posts
Default Re: Astro Ventilation (GATOR454)

Put in a removable rear window and your ventilation problems are gone.

Great mod.

Terry
trw is offline   Reply With Quote
Old 09-05-2003, 12:12 PM   #10
GATOR454
CF Senior Member
Thread Starter
 
GATOR454's Avatar
 
Member Since: Aug 2003
Location: Cary North Carolina
Posts: 658
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Astro Ventilation (Wrencher)

Thanks for the info.

When I first bought the car I was scrathing my head trying to figure out how it could possibly work and figured it must have been removed. Thanks for enlightening me.

Last night I told my Wife that the car has lied to me twice now. The first is a running battle as to whether or not the door is actually a jar or not (bad switch) and now that it has Astro Ventilation when it never did.

She said "That settles it the car is a Male." I told her that I disagreed and ran away as fast as posible since it would be an argument that I couldn't possibly win. :banghead:

Thanks again
David
GATOR454 is offline   Reply With Quote
Old 02-25-2016, 10:41 PM   #11
marinfarms
Junior Member
 
Member Since: Feb 2016
Posts: 8
Thanked 0 Times in 0 Posts
Default does my 1974 w/ac have astro ventilation

how do I find out if my 1974 with A/C have astro ventilation?

Did they not come with it if they had A/C?
marinfarms is offline   Reply With Quote
Old 02-25-2016, 10:43 PM   #12
marinfarms
Junior Member
 
Member Since: Feb 2016
Posts: 8
Thanked 0 Times in 0 Posts
Default

I forgot to mention it is a coupe

Thanks for your help
marinfarms is offline   Reply With Quote
Old 02-25-2016, 11:11 PM   #13
mr303
CF Senior Member
 
mr303's Avatar
 
Member Since: Aug 2006
Location: Wellington, New Zealand
Posts: 320
Thanks: 0
Thanked 2 Times in 2 Posts
Default

Astro vents are open when the heater control is in the C position and closed when it is in the H position, they are vacuum operated.
mr303 is offline   Reply With Quote
The Following User Says Thank You to mr303 For This Useful Post:
marinfarms (02-26-2016)
Old 02-25-2016, 11:50 PM   #14
marinfarms
Junior Member
 
Member Since: Feb 2016
Posts: 8
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by mr303 View Post
Astro vents are open when the heater control is in the C position and closed when it is in the H position, they are vacuum operated.
thanks for that. How can I tell if I have the astro ventilation?
marinfarms is offline   Reply With Quote
Old 02-26-2016, 12:02 AM   #15
Brcmpbl
CF Senior Member
 
Brcmpbl's Avatar
 
Member Since: May 2012
Location: Calgary Alberta
Posts: 1,353
Thanked 39 Times in 37 Posts
Default

If you have AC, you don't have Astro Ventilation. It's that simple.

Also, I think this thread is 13 years old.

Last edited by Brcmpbl; 02-26-2016 at 12:02 AM.
Brcmpbl is offline   Reply With Quote
The Following User Says Thank You to Brcmpbl For This Useful Post:
marinfarms (02-26-2016)
Old 02-26-2016, 12:09 AM   #16
Haggisbash
CF Senior Member
 
Member Since: Oct 2012
Location: Dunedin NZ.
Posts: 1,182
Thanked 36 Times in 36 Posts
Default

Quote:
Originally Posted by marinfarms View Post
thanks for that. How can I tell if I have the astro ventilation?
If you have an air con car there is no Astro Ventilation other than it says you have on the windows! I have an AC car with most of the AC missing so I took the blanking plate off the vents and leave them open.
I like the computer fan idea to exhaust more air from the cabin but I'm considering using the vent fans they use to get air into race car cabins and put them where the kick panel doors would have been in a non a/c car. Refitting all of missing air con to my car is beyond my budget at least for the time being.
Haggisbash is offline   Reply With Quote
The Following User Says Thank You to Haggisbash For This Useful Post:
marinfarms (02-26-2016)
Old 02-26-2016, 12:18 AM   #17
marinfarms
Junior Member
 
Member Since: Feb 2016
Posts: 8
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Brcmpbl View Post
If you have AC, you don't have Astro Ventilation. It's that simple.

Also, I think this thread is 13 years old.
Thank you.
That is exactly what I needed to know. I looked every where on the internet and could not find this info.
Thanks again
marinfarms is offline   Reply With Quote
Old 02-26-2016, 08:36 AM   #18
Easy Mike
CF Senior Member
Support Corvetteforum!
Cruise-In II Veteran
 
Easy Mike's Avatar
 
Member Since: Jun 2000
Location: The Bluegrass State
Posts: 34,984
Thanks: 0
Thanked 588 Times in 540 Posts
Default

Quote:
Originally Posted by marinfarms View Post
...how do I find out if my 1974 with A/C have astro ventilation?...
Astro-Ventilation is nothing more than a trade name for GMs fresh air vent system for early C3s. All 68-75s had Astro-Ventilation. AC cars had Astro-Ventilation but used different ducting for cool air handling which non-AC cars did not use. Door glasses have Astro-Ventilation scripts.


Last edited by Easy Mike; 02-26-2016 at 08:39 AM.
Easy Mike is offline   Reply With Quote
The Following User Says Thank You to Easy Mike For This Useful Post:
marinfarms (02-26-2016)
Old 02-26-2016, 10:17 PM   #19
marinfarms
Junior Member
 
Member Since: Feb 2016
Posts: 8
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Easy Mike View Post
Astro-Ventilation is nothing more than a trade name for GMs fresh air vent system for early C3s. All 68-75s had Astro-Ventilation. AC cars had Astro-Ventilation but used different ducting for cool air handling which non-AC cars did not use. Door glasses have Astro-Ventilation scripts.

Thanks Easy Mike, that helps a lot. I need to replace the driver side window on my 74 with AC. should I get the window with or with out
the Astro-Ventilation. I saw an article that said they installed all
the 74's with windows that had the Astro-Ventilation script on them.

I have to say that this forum has been great for info that is
otherwise hard to find.

Thanks to Everyone
marinfarms is offline   Reply With Quote
Old 02-27-2016, 01:15 AM   #20
Brcmpbl
CF Senior Member
 
Brcmpbl's Avatar
 
Member Since: May 2012
Location: Calgary Alberta
Posts: 1,353
Thanked 39 Times in 37 Posts
Default

Depends what you want, really.

If you want the car to appear as it did from the factory, get the Astro script on the glass. All cars did have the script in 1974, you're correct.

If I was replacing the door glass on my 1970 with AC, I would get the glass with the Astro script, but I like that kind of thing.
Brcmpbl is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Astro Ventilation
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Window scratches crawfish333 C3 General 12 07-11-2017 05:40 PM
    WTB: Original door glass 71 convertible 62corvette C3 Parts for Sale/Wanted 1 03-10-2017 11:57 AM
    68 astro ventilation Rescue Rogers C3 General 34 12-01-2016 11:22 AM
    1969 Astro ventilation plenum drain hose steffan C3 General 5 06-22-2016 10:01 PM
    Astro Ventilation? Silver72 C3 Tech/Performance 20 05-12-2016 08:27 AM


    Tags
    2003, air, astro, c3, conditioning, corvette, engaine, plenum, problem, rear, removable, ventalation, ventilation, window, work

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump

    Sponsored Ads
    Vendor Directory

    All times are GMT -4. The time now is 06:12 AM.


    We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
     
    • Ask a Question
      Get answers from community experts
    Question Title:
    Description:
    Your question will be posted in: