A/C Duct Hole
Thread Starter
Melting Slicks
Joined: Nov 2001
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From: God's Country The Old Dominion
A/C Duct Hole
The underside of the center duct in my '68 has a hole in it which was previously covered with duct tape. I don't see it in the manual. What is it and what function does it serve? Thanks. 
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,793
Likes: 58
From: God's Country The Old Dominion
There are a few rivets that were previously holding something on. Do you recall if it was more duct or just a grille of sorts? Thanks for your response.
Thread Starter
Melting Slicks
Joined: Nov 2001
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From: God's Country The Old Dominion
Race Director
Joined: Oct 2000
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From: Shamong, NJ
The hole is there, because it's the wrong duct. 336471 is listed in the Corvette parts book as the 74-76 AC center distribution duct.
As jnb5101 guessed, it's for the air vent in the lower right front of the driver's side dash, on air conditioned 74-76's. The extra dash vent was not used on 68-73's, or on any non air cars.
This info came out of a 1981 parts book, which is the only one I have at the house, and it only lists the ducts back to 74. All of my earlier books are at the shop, but if you need the 68 part number, I can probably get it in the morning.
As jnb5101 guessed, it's for the air vent in the lower right front of the driver's side dash, on air conditioned 74-76's. The extra dash vent was not used on 68-73's, or on any non air cars.
This info came out of a 1981 parts book, which is the only one I have at the house, and it only lists the ducts back to 74. All of my earlier books are at the shop, but if you need the 68 part number, I can probably get it in the morning.
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,793
Likes: 58
From: God's Country The Old Dominion
The hole is there, because it's the wrong duct. 336471 is listed in the Corvette parts book as the 74-76 AC center distribution duct.
As jnb5101 guessed, it's for the air vent in the lower right front of the driver's side dash, on air conditioned 74-76's. The extra dash vent was not used on 68-73's, or on any non air cars.
This info came out of a 1981 parts book, which is the only one I have at the house, and it only lists the ducts back to 74. All of my earlier books are at the shop, but if you need the 68 part number, I can probably get it in the morning.
As jnb5101 guessed, it's for the air vent in the lower right front of the driver's side dash, on air conditioned 74-76's. The extra dash vent was not used on 68-73's, or on any non air cars.
This info came out of a 1981 parts book, which is the only one I have at the house, and it only lists the ducts back to 74. All of my earlier books are at the shop, but if you need the 68 part number, I can probably get it in the morning.
Thanks for the offer but this car is far from correct. When I purchased it I thought it had factory air however when I replaced the harness I found that it appeared to be a non air car with air added. A lot of mysteries. (no trim tag). Maybe you solved one of them...I now know what year the a/c system is. I think I will put the duct back in.
