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Astro Vent

R

rpounds

Guest
My '75 appears to have had the Astro Vents glassed over. I have been unable to ascertain the correct configuration. If anyone has specific information, or better yet, can provide photos of their astro vents, I would be appreciative.
 
R

rpounds

Guest
Uh . . . that's fine, but it doesn't answer my question. I'm looking for specific information on the Astro Vent feature.
 

Tom73

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Aug 21, 2001
Messages
1,427
Location
Round Rock, TX
Corvette
73 LS4 Coupe - 04 CE Conv
rpounds said:
My '75 appears to have had the Astro Vents glassed over. I have been unable to ascertain the correct configuration. If anyone has specific information, or better yet, can provide photos of their astro vents, I would be appreciative.

The astrovent system was only on non-A/C cars. It is non functional on A/C equiped cars (has dummy vents on rear deck). The Astro Vent was an air exhaust system. When the car was taking in air up front, the vacuum system would open two flaps in the rear bulkhead that would exhaust air out.

tom...
 
R

rpounds

Guest
Ah, Tom . . . so your telling me that the vents were not glassed in . . . rather, since my vette is air conditioned, it was this way from the factory. This all makes sense to me . . . I was wondering who did such a great job on the glass!!

Again, thank you.

Ron
 

69MyWay

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Auburndale, Florida
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1969 Killer Shark
That is so funny, because I am getting ready to "glass" in my rear "astro" vents. I plan on cutting some fiberglass panels out of some flat glass scrap I have in the back yard, and simply bonding them over the open vents.

I think the only time the Asro Ventilation did any good was in the Winter time anyway.
 
R

rpounds

Guest
These things are a major pain when it comes to washing this area. It is impossible to get all of the water out of the fake vents, which really become nothing more than reservoirs. If it were not for attempting to retain originality, I would figure a way to fabricate a drain for this area.
 

silver 80

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562
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madison,wi
Corvette
1980 silver with blk interior 1987 blue / blue
astro vents

I just use a little compressed air to blow the water out that's when I had a 75.
tom
 
R

rpounds

Guest
Yeah, I did that too. It blew a little chip of paint off. Now, I have to re-paint the grills.
 

Jack

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Florence, SC (Timmonsville SC)
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71 War Bonnet Yellow VERT 71 BH Blue CPE (SOLD)
Astro Drains

My 71 cpe with AC is not where I can take a quick look ... but I seem to recall the dummy Astro vents just behind the rear glass DO have a drain(s) ...maybe it/they dumped into rear wheel well?? I can't remember ... have to take a look in a day or two. Maybe I'm delusional too .. we'll see?
JACK:gap
 

69MyWay

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1969 Killer Shark
When these things are functional, you can stick your whole hand down in them. In fact, I am going to wait to cap them off until the paint is complete so there will be a "flow" of air to discourage junk from flying up into the paint. They also have drains that run off into the rear inner quarters. These were plugged solid and causing the water to back up and pour into the rear of the car.
 

silver 80

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madison,wi
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1980 silver with blk interior 1987 blue / blue
air pressure is the key:D to remove the water and not paint:gap
 

Tom73

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Round Rock, TX
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73 LS4 Coupe - 04 CE Conv
Re: Astro Drains

Jack said:
My 71 cpe with AC is not where I can take a quick look ... but I seem to recall the dummy Astro vents just behind the rear glass DO have a drain(s) ...maybe it/they dumped into rear wheel well?? I can't remember ... have to take a look in a day or two. Maybe I'm delusional too .. we'll see?
JACK:gap

Jack,
Yours should have the chambers and drain. But in '75 Chevy did away witht he chambers and just left an indention that the grills set in to maintain the look. 74 and earlier coupes with A/C did have the chamber and drains, just the venting was non-functional. These were maintained as the grills were over the interior storage compartment. On the 74 and earlier convertibles, the grill is there but it is open to the ground. The convertibles had the grills behind the interior storage compartment, so no need for drains.

tom...
 
R

rpounds

Guest
Next question . . . I have heard some of the other NCRS guys say that the Astro Vent grills and the fresh air vent at the rear of the hood should be painted black. Can anyone verify the original color of these components?
 

Tom73

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Round Rock, TX
Corvette
73 LS4 Coupe - 04 CE Conv
rpounds said:
Next question . . . I have heard some of the other NCRS guys say that the Astro Vent grills and the fresh air vent at the rear of the hood should be painted black. Can anyone verify the original color of these components?

They should be body color. On the rear vents, the compartment below the vents are a semi-flat black.

tom...
 

Jack

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Dec 27, 2000
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Location
Florence, SC (Timmonsville SC)
Corvette
71 War Bonnet Yellow VERT 71 BH Blue CPE (SOLD)
defogger/defroster?

TOM73:
Thanks. Finally, checked my 71 cpe w/ AC. Rear Astro vent chambers/wells are there and they drain to top of wheel wells. Been repainted at least once, wells are body color now ... along with grilles. Interesting about how 75 up cpes just have indents. Other than the discrete panel/grille between hood & wiper door, mine has no hood grille. Mine seem to function rather well as pinestraw catchers!

Question: Somewhere I've seen references to rear window defogger/defroster ... is this referring to a convertible/removeable hardtop ... and those same (but functional) Astro vents?
JACK:gap
 

Tom73

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1,427
Location
Round Rock, TX
Corvette
73 LS4 Coupe - 04 CE Conv
Re: defogger/defroster?

Jack said:
Interesting about how 75 up cpes just have indents. Other than the discrete panel/grille between hood & wiper door, mine has no hood grille.
Just as a side note, the rear grill went away in 77. In 75 they became totaly nonfuntional even on non-A/C cars (most had A/C by then anyway). Also the hood grill started in 73 when they did away with the wiper door.

Question: Somewhere I've seen references to rear window defogger/defroster ... is this referring to a convertible/removeable hardtop ... and those same (but functional) Astro vents?
JACK
Both the coupe and conv had the option for a rear window defroster. These were forced hot air units that were located in the driverside of the rear storage area and had ducting to blow air on the rear window. No connection with the AstroVentulation.

tom...
 

topless82vette

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Nov 1, 2001
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910
Location
southern california
Corvette
1982 convertible (not factory) stock 350cfi auto
the 74 rear convertible clip I put on my 82 has neat block of plates that pop rivet in place of the astro vent holes, you might want to consider finding a pair of these
 
R

resto75

Guest
rear grilles

I use a sponge to (attempt) to get the water out of the recess. This is not too good a method but it gets out most of it. It is really a bad design and should of never been made that way. I have even unscrewed the grilles and sponged out the water.
It just one of those things that you have to put up with. One day I"ll make a drain for it, but I hate drilling holes in the car.

Roy
 

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