Sign in to follow this  
jimtash

Anybody know of a source for the dual A/C vacuum actuators?

Recommended Posts

Does anybody have a souce for the dual vacuum actuators that fit the '63's? I can find the single actuators from several different vendors but the duals are no where to be found. If they are no longer available new from anywhere, can the older one's be rebuilt? Thanks.

Share this post


Link to post
Share on other sites

They sell the single actuators but not the duals.

The duals are located underneath the blower motor BTW.

Thanks though. Anybody else got any suggestions?

Share this post


Link to post
Share on other sites

I ordered and received dual vacuum actuators from them for my 1964. By "dual" do you mean two vacuum ports, or two linkages.

In this case, I am referring to dual meaning two vacuum ports.

alex roa 11550

Share this post


Link to post
Share on other sites

The dual diaphragm under the blower on the '63 is actually 2 diaphragm cans stacked on top of each other. It is not available new from any aftermarket supplier that I know of. Getting a good used one or looking for NOS is your only option.

You can make the 2-port diaphragm that Old Air Products sells work in this application, if you are willing to depart from original. (Because it is out of sight, under the blower, it is not very obvious that you are no longer original.)

The main problem you find with the OAP 2-port diaphragm is that you can no longer get the "part open" position of the actuator. You need to plug the vacuum hose that would normally put the diaphragm in the part open position, and T- the other vacuum hose (the full open hose) into both ports of the 2-port diaphragm.

I did this on my '63.

Then you get full open or full recirculation, never partial recirculation.

The reason you need to do this is because of the way the Old Air Product diaphragms are all inside the same can. The original stacked cans were separate and you could apply vacuum to one port or the other (or both) and not have anything leak between them. The OAP 2-port diaphragm requires vacuum on just the outer port for partial movement and vacuum on both ports for full movement. That is not what our '63 heating-A/C controllers gives us down at that position.

Share this post


Link to post
Share on other sites

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jimtash</div><div class="ubbcode-body">Jim, you are a lifesaver. Thanks a whole bunch man. </div></div>

No problem.

The next time I am in Asheville you can show me your car, and buy me a beer!

cool.gif

PS - don't throw that old double actuator away. I have not figured out yet how to open the can, replace the diaphragm, then reassemble, but I'm working on it. I will need some old dead units to experiment on.

Share this post


Link to post
Share on other sites

You got it.

I still have the dual actuators here as I was trying myself to figure out a way to repair them. I'll be happy to send them to you.

Share this post


Link to post
Share on other sites

Just hold on to it until I figure out a way to open them without destroying them. Then I will be ready for a second "victim". wink.gif

I was able to open my other vacuum motor on the firewall and rebuild it. The dual can has been a tougher nut to crack.

Share this post


Link to post
Share on other sites

I have several vacuum actuators that are in good shape except for one thing; the nipples are all broken off. Otherwise they function nice and tight. What would you suggest as a remedy? It would be a shame not to use them and have to spend money on top of it to replace perfectly good working parts for such a minor problem.

The top canister can easily be replaced with a new one. The bottom one though is a different story so let me know what you come up with. Your solution works just fine but it would be nice to have the system working just like the Buick engineers designed it to. I guess I'm just picky that way.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this