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'41 Fresh Air Intake


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On the dash of my '41 Super, there's a on/off switch marked "Fresh Air" that should open and close the air intake to the defroster unit on the firewall.  On my car, the linkage is present under the dash, but the control rod just ends where it goes through the firewall.

 

1492567697_defroster_intake(2)_LI.thumb.jpg.41deda32bcdec3302c83b40f3fcb60ee.jpg

 

Could someone post a photo of what should be there?   Thanks!

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Here's my air intake. There's a collar with a butterfly plate inside that opens and closes with the knob under the dash. Pretty simple mechanism once you see it. Mine is fed by a fresh air duct from inside the fender, but I think on non-Limiteds it is fed from up by the grille? I don't really remember. But your firewall mechanism should look like this (note that my heaters and defroster are not hooked up to the coolant lines):

 

INTAKE:  1971515877_2019-06-1419_00_09.thumb.jpg.c65d28fa83115db657bcbd61e56023f8.jpg

 

CLOSED: 2111009387_2019-06-1418_59_33.thumb.jpg.443feff4a7c830fda1450d6612f9018c.jpg

 

OPEN:     94603918_2019-06-1418_59_57.thumb.jpg.772b9066e5bb9a5b418d9ae98ea9e170.jpg

 

Guess I should clean out the air intake, eh?

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Thanks, Matt, that's exactly what I needed to see.  It's odd because it looks like I have a shorter collar without the butterfly plate, even though it doesn't look like it's been cut down or anything.  And I have the knob and all the linkage under the dash and the control rod coming through the firewall in the right place.  So all I need to find is the correct collar with the butterfly like you have -- should be easy to find, right? 😉

 

Any suggestions about where to look would be most welcome!

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3 minutes ago, 1940Super said:

I'm trying to find clamps that look like the original for my fresh air duct and heater hose. Does it have a particular name for the clamp?

 

They look a lot like Ford hose clamps:

 

s-l1600.thumb.jpg.c19aac6602873c98d8bbcfe642ad9a2c.jpg

 

https://www.ebay.com/itm/NOS-VINTAGE-1930-53-FORD-RADIATOR-HOSE-CLAMP-HOT-ROD-SCTA-FLATHEAD-BANGER-CHEVY-/133034043557

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  • 1 year later...

Neil, Matt or other 1940 Buick owners,

 

I recently purchased a 1940 Buick 46C convertible(see attached picture) and I'm trying to locate and replace missing parts. The part(s) I'm looking for now is the linkage from the control (under the dash) to the fresh air vent butterfly valve (on the firewall) shown in the 1st link. I have all the parts to control the valve except the linkage. Can Neil or Matt take pictures of what the linkage looks like under their dash and at the butterfly valve so I know how make a replacement linkage? I have searched for the linkage on the internet and have not found one to show me what it looks like and how long. I included the first picture on this thread plus pictures from my own 1940 Buick.

 

Don (2Buicks+1more)

1969 Buick Riviera

1952 Buick Super 4dr

1940 Buick Special Convertible

 

1940 Buick.JPG

1492567697_defroster_intake(2)_LI.thumb.jpg.41deda32bcdec3302c83b40f3fcb60ee.jpg

Fresh Air Vent4.JPG

Fresh Air Vent2.JPG

Fresh Air Vent3.JPG

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All, Another question I have is what does the vent duct connect to in the front, next to the radiator? I found pictures of vent ducts on eBay and was wondering if this is what the flex hose connects in the front of the engine compartment..

 

Don (2Buicks+1more)

1969 Buick Riviera

1952 Buick Super 4dr

1940 Buick Special Convertible

s-l1600.jpg

Edited by 2Buicks (see edit history)
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I'll try to go out to the '40 Super convertible I have out in the shop and take some photos of the linkage, which is slightly different from the '41, mostly in the lever on the dash (it's a turn knob on the '41s)

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Hi Don:

 

As Matt points out, he and I have '41's, and the linkage is a bit different.  But it looks like Matt fortunately has a '40 on hand.

 

To answer your other question (at least in reference to a '41), the hose from the fresh air duct on the firewall just fits through a hole on the right side of the radiator support.  Apparently, there is no clamp of any kind, the hose is just twisted into the hole.

 

Neil

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20190729_190631.thumb.jpg.644cb7f04e37cf479b8fe2d0ca467ee7.jpgThe two "wire" type clamps are 1941 Buick air cleaner clamps for dual carb air cleaner outside air duct. The modified 'U' shape strap with two humps is used to hold outside air duct/hose to damper for  interior intake and heater hose on passenger inner fender, I believe for both '40 &'41. The out side air linkage rod is laying across with duct tape on it. The small damper attaches to passenger side firewall & has a connecting rod with an 'eye' for the outside air control rod to connect to it. And yes the clamp laying on the damper is what was originally installed. Hope that helps! Im old, but I am slow! Pm if interested in these parts.

Edited by 2carb40 (see edit history)
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2carr40,

 

Do you have another picture of the linkage rod and how long it is? From the picture, it looks like there is some kind of tape raped around it below the U shaped clamp and the end, at the top of the picture, is in a bag. I believe from the picture the right angled piece of the rod, in the left hand corner of the picture, is what connects to the butterfly valve and the end inside the bag (can't determine what its shape is) connects to ivory knob under the dash. Is this correct? 

 

Neil,

Thank you for your information of how the vent air duct attaches up front. When I added the missing air vent duct to my 40 Buick, that is what I did was to shove it into the opening next to the radiator. The part I do not have is the U shaped clamp to hold the vent duct in place along with the two heater hoses. I will make that missing piece unless I can't find it on eBay.

 

Ben,

 Thank you for clarifying what the two defroster ducts are. Based on your comment, I will leave on ebay for someone else to purchase.

 

Matt,

Thank you for your reply. Also, based on your 1940 Buick Super 56C Convertible link, I went and viewed all the pictures to see if I could gain any information on how the linkage was installed. That 1940 Buick Super you have listed is a beautiful car.

 

Don (2Buicks+1more)

1969 Buick Riviera

1952 Buick Super 4dr

1940 Buick Special Convertible

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20200627_202820.thumb.jpg.fe5ff4a05609e98c646aae4a5e44357b.jpgHere is another version of the combo clamp recently found on current 40 Super Im disassembling. Dont know if this is Buick factory or not as only one Ive seen. Others have all been of that spring into the slots in the inner fender type double hump looking clamp. Interested to know if changed over time or not even Buick, thoughts/experiences?

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20200627_202820.thumb.jpg.fe5ff4a05609e98c646aae4a5e44357b.jpgHere is another version of the combo clamp recently found on current 40 Super Im disassembling. Dont know if this is Buick factory or not as only one Ive seen. Others have all been of that spring into the slots in the inner fender type double hump looking clamp. Interested to know if changed over time or not even Buick, thoughts/experiences?

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20190709_111047.thumb.jpg.4a866be419df97d7c654e253d0e1f116.jpg20190709_112215.thumb.jpg.9f1424f2e89d763d02cf07ce991eef02.jpgThese are shots I posted b4, but searching here is much to difficult, so Im posting again of 41 Cent with just over 4,000 actual miles! My personal frame of reference that I was generously allowed to take many photos of. Some hardware is common in the engine compartment for '40&'41, some not. Just cuz I ID it as 41 doesnt mean 40 is excluded on some parts. Ive duplicated the cad plated look by using POR 15 SILVER. NO SUN OR LITTLE SUN NO BREAK DOWN OF PAINT. Sun exposure will break down POR PAINT!

Edited by 2carb40 (see edit history)
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2carb40,

 

Thank you for the great pictures you provided. This will help me in making the brackets for my 40 Buick.

 

Don (2Buicks+1more)

1969 Buick Riviera

1952 Buick Super 4dr

1940 Buick Special Convertible

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4 hours ago, 2Buicks said:

2carb40,

 

Thank you for the great pictures you provided. This will help me in making the brackets for my 40 Buick.

 

Don (2Buicks+1more)

1969 Buick Riviera

1952 Buick Super 4dr

1940 Buick Special Convertible

Your very welcome! Be careful if you purchase a control rod. B4 I looked at the book I made an a-- otta u & me by ass-uming 40's were all same, but no according to parts #s. Im PRETTY CDO about this stuff, so Im going to attempt to locate a control rod for '40 Spec otta curiosity. Oh yeah, that acronim(sp?)of ocd. Us folks know who really are that ocd is alphabetically incorrect! It simply must be CDO! HEAHEA!

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  • 2 weeks later...

 

The Rest of the Story

 

When Don (2Buicks) revived this thread, it had the effect of finally getting me and Greg (2carb40) to finally complete a transaction that we had started over a year ago for me to get the hardware I needed to get my Super defroster back to factory specs.

 

First, going back to the first photo I posted, I was very confused because my car had a collar for a 3" duct on the firewall side of the defroster, with no damper, which left the control rod from the dash knob hanging out in the wind, not connected to anything.

 

defroster_intake5.thumb.jpg.efe123ecab85134b57f14c70f877b058.jpg

 

 

After talking to Greg, we determined that this "collar," in fact, belonged on the other side of the engine compartment.  It was supposed to be the connector between the duct from the air cleaner and the radiator support on the driver's side. I removed it and installed it where it should have been.  I have no idea why "Mr. Good Wrench" (my not-so-affectionate nickname for the former owner of my car) decided to flip it over to the other side, but at least I figured out where it was supposed to go!  Here's what it looks like back where it should be after a fresh coat of semi-gloss black paint.

 

air_cleaner_intake2A.thumb.jpg.b748942f425fb70ac9dfb16e923f9bd4.jpg

 

Next, I got the hardware from Greg, including the damper that should have been there in the first place, as well as the clip that holds the 2-and-a-half inch duct from the defroster (along with the heater and defroster hoses) to the side of the engine compartment.  Here's what it now looks like all buttoned up.

 

 

defroster_intake4A.thumb.jpg.d31e4ebb833479d59a9e25ee6828b603.jpg

 

defroster_intake3A.jpg.d1ea230e00494a914660ae4ebef3bdcd.jpg

 

So now I can turn a knob on the dash to select between fresh air and recirculating air to the defroster, as originally intended by the Buick engineers!  Not a big deal, but one more step to getting my car back to the way that it was intended to be when it left the factory.  A big thanks to Greg @2carb40 for his generous assistance!

 

 

 

 

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Im glad another Buick fan has his car adjusted to "right with the universe" as I call it! Thanx for your kind words and patience, both are appreciated! Glad things worked out well ultimately! 

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  • 2 weeks later...

Based on all the inputs from fellow Buick owners, I have my 1940 Buick Convertible fresh air vent working. On Saturday, I used a coat hanger to mock up a control linkage from the dash knob to the fresh air vent butterfly valve (on the firewall). It took several tries of modifying the coat hanger until I got the desired movement over the defroster/heater hoses under the dash. After I achieved the desired shape, I took an old door lock rod and repurposed it for my new control linkage. The installation turned out great and the vent control knob works like a charm. Included below are the pictures of the mock-up linkage and what the final installation looks like under the dash and on the firewall.

 

72297661_linkageRods3.jpg.9fb3d421303496dd5a868f44c569bb88.jpg  446804006_rodthroughfirewall.jpg.2abb4a89d3199452c99ffc5dd14863e0.jpg

 

316406407_rodoverdefrosterhose.jpg.da7383347462ab51eddfa3c227670de3.jpg106346776_knobandlinkagerod.jpg.83af8c2db04fb0c24190edcf53d7821d.jpg

 

2128082219_butterflyclosed.jpg.e4e65b30938d8241c17a5050a5bce5fd.jpg  644934556_butterflyopen.jpg.9640babc2bebf0b7ce25814e95ab9db7.jpg

 

Edited by 2Buicks (see edit history)
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Bravo! When I looked at Buick factory parts book it showed a variety of different part #s for different models and no pix! Glad that you could reproduce the rod as there are few 40's Buicks donor cars for parts around here anyway!

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8 hours ago, 2Buicks said:

It may not be factory exact, but it clears the defroster hose and the ivory knob travel aligns with the on-off markings.

The judging sheet says minus 10 points for non factory part but plus 20 for ingenuity.  Great job!

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