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408 (and others) fresh/cold air ventilation question.

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Old 15-03-21, 12:34 AM
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Location: Florida / Nova Scotia
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Default 408 (and others) fresh/cold air ventilation question.

My car has had the control lever for the fresh air vents removed. The cables to the vents have been cut. The vents seem to be rusted in the closed position. I am wondering how they are supposed to operate. Am I right in thinking the vent opens outward toward the plenum aft of the engine compartment? That they open by the cable pushing them rather than pulling? That the closing flap is not hinged on one side but instead is swung outwards on two pivoting arms and held open parallel to the opening itself.

Any suggestions on freeing the frozen mechanism or am I better off leaving it all as is in case of water entering from the plenum?

Thanks for any help.

David
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Old 15-03-21, 05:46 PM
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Hi David.
The vent is controlled by pushing the inner cable. Picture 1
The control unit is the same type as AH 3000, and surely other Britsh cars. Picture 2, 3. As you can see in the pictures is it an unversal unit and both static part and handle can be angled differtly.
/Per
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Old 15-03-21, 06:44 PM
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Quote:
Originally Posted by 408VIKING View Post
Hi David.
The vent is controlled by pushing the inner cable. Picture 1
The control unit is the same type as AH 3000, and surely other Britsh cars. Picture 2, 3. As you can see in the pictures is it an unversal unit and both static part and handle can be angled differtly.
/Per
Thanks for the helpful pictures. I spotted this lever on eBay. It is the same as on a Sunbeam Alpine and, obviously, other Rootes products of that era. I am pretty sure it is the same as the Bristol originally had.

Hopefully I am right (although I need to find a clamp to hold two cables) and I can free up the cold air vent doors.

David

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David Womby
1964 408-7023 Florida/Nova Scotia
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File Type: jpg cold air lever.jpg (200.5 KB, 20 views)
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Old 06-04-21, 06:59 PM
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I fitted new cables and a new lever assembly and the fresh air vents now open and close as they should. In the end I opted for a twin lever assembly so that each vent can be controlled independently although I am not sure there's much benefit to that. It was quite inexpensive off eBay and was a BL part for the MG1100. A similar one is available for the Austin 1100. I hope to get proper knobs at some point but for now the levers have rubber vacuum caps fitted as knobs. The whole assembly is quite unobtrusive below the dashboard.

David
Attached Images
File Type: jpg 20210406_144703 (Copy).jpg (256.2 KB, 12 views)
File Type: jpg 20210406_144730 (Copy).jpg (253.4 KB, 11 views)
File Type: jpg 20210406_144640 (Copy).jpg (308.0 KB, 14 views)
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Old 08-04-21, 06:43 PM
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I thought I damaged one of the cable retaining bolts on the lefthand fresh air vent and a closer inspection revealed that I had!

I didn't want to risk it detaching in the future so I decided to replace it. It snapped as soon as I touched it.

The question now was: where the heck do I find a replacement? An internet search and visits to local hardware stores were unfruitful. Then an idea occurred to me and a visit to our local bicycle repair shop produced a suitable part.

I had to enlarge the hole slightly which was really awkward but a curved rattail file got it opened enough.

All done. Cost $2.56 including tax.

David
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David Womby
1964 408-7023 Florida/Nova Scotia
Attached Images
File Type: jpg 20210406_144605 (Copy).jpg (279.4 KB, 10 views)
File Type: jpg 20210408_112100 (Copy).jpg (164.0 KB, 10 views)
File Type: jpg 20210408_130600 (Copy).jpg (169.9 KB, 11 views)
File Type: jpg 20210408_140212 (Copy).jpg (354.8 KB, 11 views)
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