AC plenum valve

[CantRepeat]

As I'm working through the AC vacuum system on my 67 I have discovered that the plenum valve and flap assembly is missing.

I've got a restored piece ready to install but before I do could some one tell me what purpose this assembly served? Is to let fresh air into the system/cabin?

Is it possible to remove the cowl vent grill without removing the windshield trim? Obviously it will need to come off to install the new plenum valve assm.

Thanks!

[Petes L48]

If you search the Heating & Cooling section at the TC site with key words , there are numerous discussions.  As this one mentions, check out the 67 Chassis Service Manual for an overview of how the system works.

https://www.camaros.net/threads/ac-vacuum-controlled-dampers.280601/#post-2425665

I think the grill should come out, but first lay down masking tape so no paint gets scratched.

[CantRepeat]

Thanks.

Like most forum search engines, I wasn't getting many fruitful results.

[decarter67]

Tim -

Any chance you still have the cowl grill off your car?  When I had the bodywork done on my car with the intent of adding factory air, I had a new firewall welded in, but didn't know about the cowl plenum valve and the cut-out needed to install it.

Any chance you - or anyone else reading this - has some accurate measurements for that cut-out on the top of the cowl?  I'm going to have to make that cut myself and would like to get it in the right spot and the right size!  I've seen one set of photos that give a pretty good picture of where it's located, but if possible, would like some real measurements.

Thanks in advance for any info.

Dale

[Petes L48]

Too late to take measurements, but here's a few more pictures for you.  67 11B LOS.

[CantRepeat]

Tim -

Any chance you still have the cowl grill off your car?  When I had the bodywork done on my car with the intent of adding factory air, I had a new firewall welded in, but didn't know about the cowl plenum valve and the cut-out needed to install it.

Any chance you - or anyone else reading this - has some accurate measurements for that cut-out on the top of the cowl?  I'm going to have to make that cut myself and would like to get it in the right spot and the right size!  I've seen one set of photos that give a pretty good picture of where it's located, but if possible, would like some real measurements.

Thanks in advance for any info.

Dale

Sorry, I don't. I put it all back together shortly after this post.

[decarter67]

Thx for the photos.  Hopefully, I can make this work.

Dale

[67CruiseMaster]

Instead of allowing outside air into the interior of your car, that flapper just uses inside air to recirculate.

Scot