70-72 Air conditioning under dash ductwork questions

[Mike E.]

First time I've been under the dash of a C3 ac car. This area was disassembled 36 years ago, and I hope the parts we are working with are the correct ones.
My dilemma is with how the left hand duct fits against the back of the left hand dash, specifically where it connects to the short duct that houses the finned "ball" that deflects the air.
See the AIM sheet with the red arrows. 1) How does the duct (5) fit the other duct and not interfere with the operation of the fluted chrome knob and the external linkage that governs the flap position inside the duct? 2) What does piece 3 (3885999) look like, and how does it bridge the gap between the duct bracket and the mount on the back of the dash?
The orientation of the bracket on my 5 (3949987) is different than that of the illustration. It is on the bottom of the duct and protrudes at an angle, whereas the one in the illustration sits on the face of the duct and appears to be reasonably straight.
Wrong part? Wrong guy trying to figure it out? BTW, disregard the "right" on the linkage. It is a left.
Scan_20210314 (2).jpg
air conditioning ductwork under dash left (1).jpg air conditioning ductwork under dash left (4).jpgair conditioning ductwork under dash left (6).jpgair conditioning ductwork under dash left (3).jpg

[Sal C.]

Re: 70-72 Air conditioning under dash ductwork questions

s-l1600.jpgMike, while I don't have a car here at this time to look at, I can tell you that the (3) 3885999 is a U-nut that the screw threads into to hold the duct in place, It slides onto the metal bracket at the bottom of the dash pad. Does the duct dave an actual part number on it? It doesn't look right to me from what I remember.

[Stan B.]

Re: 70-72 Air conditioning under dash ductwork questions

My 1971 with air conditioning looks like the example Sal Carbone provided. I wonder if AC cars have different version?

[Sal C.]

Re: 70-72 Air conditioning under dash ductwork questions

AC cars are the only ones with that style duct.

[Mike E.]

Re: 70-72 Air conditioning under dash ductwork questions

Sal,
Thanks for the help. As I looked through a couple of ducts sitting on the shelf, I found one configured like that without the vent and grille on the bottom. So I took the vent and grille out of the duct in my picture, which was apparently a wrong duct from who-knows-where that came with the car, and cut a 2" hole in the one from the shelf, and now I have a correct duct assembly. Thanks again!
Mike

[Brad Hillhouse (37766)]

Re: 70-72 Air conditioning under dash ductwork questions

Mike, the one you pictured may be the one im looking for to complete my 68. Can you post a pic of the inlet side?
Thx
Brad Hillhouse

[Mike E.]

Re: 70-72 Air conditioning under dash ductwork questions

Brad,
Here are two pics of the inlet. I hope this piece is what you need. (It's missing the diffuser, because some dummy put it on a '71 duct).
duct inlet 1968 (1).jpgduct inlet 1968 (2).jpg

[Brad Hillhouse (37766)]

Re: 70-72 Air conditioning under dash ductwork questions

Hi Mike - yes, I believe that is the one I need if you would be willing to part with it I would appreciate it!

Brad Hillhouse@yahoo.com

[Mike E.]

Re: 70-72 Air conditioning under dash ductwork questions

Brad,
Sent you an email Tuesday eve.

[Brad Hillhouse (37766)]

Re: 70-72 Air conditioning under dash ductwork questions

Mike - just realized that the software auto corrected my email for me and I didnt notice it.

email is: BradHillhouse@yahoo.com

It automatically spaced my name in my prior post and made the email address invalid.

I found your email and just sent you a request.

thanks,
Brad

[Edward J.]

Re: 70-72 Air conditioning under dash ductwork questions

Mike not pretending to your post, the ducts had a foam sealing gasket on each end, I went to the local Home Depot/ Lowe’s and brought a roll of window sealing foam. Cheap stuff ,comes in different sizes.keeps the air from by-passing the duct work.