Jump to content
Captain Obvious

Electric Servos Instead Of Vacuum Driven HVAC

Recommended Posts

My car came without A/C and I'm working on adding it. I had originally planned to use my manual control head to run the system, but this does not work. The manual cable driven control heads are completely incompatible with the A/C evaporator box as they both want to occupy the same space. I had to swap over to a control head designed for A/C. That itself is not a big deal.

What IS a big deal is that the A/C control heads are vacuum driven instead of cable driven and I really really didn't want to plumb my car with all those vacuum lines. Check valves, that white tank in the engine compartment, solenoid valves, rats nest of vacuum tubing under the dash... I really, really, really didn't want to do that.

So instead of installing all the vacuum parts and tubes, I put switches on the control head and converted over to an electric servo from a Honda/Acura HVAC system to control the air distribution instead of vacuum motors. Here's the end result. Works like this:

https://www.youtube.com/watch?v=ggrks_xJAB8

Note the crappy shaky camera work... My second video ever.

Share this post


Link to post
Share on other sites

 Way cool;) You realize, of course, that the orders for a kit are going to be rolling in.

 How long did you sit and watch it work. I would have cracked a cold one to fully enjoy the experience.

Edited by Mark Maras
  • Like 1

Share this post


Link to post
Share on other sites

So that's what was shaking the camera back then? That's why those lucky guys used "tripod mounts"?  LOL

Well my phone has been dead silent on the order front, not ringing off the hook with orders as you would expect... I guess the multitude of people adding A/C to their Z's are happy adding the vacuum system. I'm clearly the outlier!

Share this post


Link to post
Share on other sites

Very nice work.

You realize you have to post wiring diagrams, and part numbers/ year/make/model of the Honda you borrowed the servo's from, don't you?

  • Like 1

Share this post


Link to post
Share on other sites

21 minutes ago, zKars said:

Very nice work.

You realize you have to post wiring diagrams, and part numbers/ year/make/model of the Honda you borrowed the servo's from, don't you?

Yeah, what he said.

Share this post


Link to post
Share on other sites

I've got all that info somewhere... I've also got lots of still pics. I'll post more details shortly.

As a side note, completely unrelated to this thread... I don't have any idea what I'm doing on Youtube. Does my other video show up for you guys or do I have to explicitly send out a link?

It's comparing my original stock beeper and my replacement pleasant sounding chime: https://www.youtube.com/watch?v=N6iRmpYgjI0

My son asked me about "My channel" and I said "My whaaaat?" He walked away shaking his head and wouldn't answer any of my questions after that . LOL

  • Like 1

Share this post


Link to post
Share on other sites

Very cool Capn' O. Maybe you could adapt a ZX "talking lady" to work in your car !!

On a serious note: where did you find that chime box?

Edited by dmorales-bello

Share this post


Link to post
Share on other sites

This gives me a whole nother' avenue to get my vacuum problem laden factory AC/heat to work.  I'll be watching fo sho. :TRUCDEOUF:

Share this post


Link to post
Share on other sites

Following. Although I have my Vacuum system working 99% right now. Still a little problem with heat control sensitivity, but I think that's because I have a seized or leaking Automatic water valve.  I wonder if that can be updated? Hmmmm..... 

Share this post


Link to post
Share on other sites

Yes, my son absolutely gave me that look. I'm consoled by the fact that I'm not the only one that gets it.

I got that warning chime bell out of a 1990 Acura Integra. They used that chime on all the first and second gen Integras as well as the early 90's sedans.

Part number 39760-SD2-A01
Used on 86-93 Integra and 90-93 Sedans

I just like it better than the original harsh sounding buzzer/beeper. I find it much more "polite". "Excuse me sir, you left your keys in the ignition" instead of "NNNNNRRRNN!!, NNNNRRRRN!!, NRRRRRNNN!!"

Share this post


Link to post
Share on other sites
3 hours ago, Captain Obvious said:

I got that warning chime bell out of a 1990 Acura Integra. They used that chime on all the first and second gen Integras as well as the early 90's sedans.

Is it just a straight 2 wire swap?

Share this post


Link to post
Share on other sites

3 hours ago, Captain Obvious said:

I just like it better than the original harsh sounding buzzer/beeper. I find it much more "polite". "Excuse me sir, you left your keys in the ignition" instead of "NNNNNRRRNN!!, NNNNRRRRN!!, NRRRRRNNN!!"

I never even knew about the buzzer until I put my new dash in. Guess it had been disconnected some time ago on my old one. First time it went off, I actually said out loud "what the hell is that!?" thinking I broke something. That's a smart swap! :)

Share this post


Link to post
Share on other sites

Sorry for the lack of correspondence. I've been off-line for a couple days. Mostly working on my kids car.

So that ding-dong is a two wire device. It "Dings" when you apply power to it, and it "Dongs" when you release the power. There's a little spring loaded clapper in there pulled to one side by an electromagnet, and pulled back the other way with a spring.

Power on - Ding
Power off - Dong

The trick is... The original buzzer device is actually in two parts. Second part is a buzzer. All it does is buzz anytime it is powered. First part before the buzzer is a little timer module that intermittently applies power to the buzzer. The timer module creates a square wave output that makes the buzzer alternate ON and OFF.

You leave the timer module in place and just run the output of that timer to the ding-dong and that way the square wave gets you both the ding and the dong.

If you just put power on it and leave it on, you get one Ding and no Dong. And a Ding without a Ding is never a good thing.

I've got pics and I promise to get them uploaded as soon as I get a chance!!

Share this post


Link to post
Share on other sites
On ‎5‎/‎10‎/‎2017 at 0:07 PM, siteunseen said:

D*** Fitzwell, ROFL

You so crazy!

Haha!! That's my "screen name" from back when I was working that video store job we talked about earlier!   LOL

Share this post


Link to post
Share on other sites

Got it Capn' ! Thanks.

So in effect, any 2 wire piezo chime (pulse or continuous tone) would work to substitute the annoying OEM buzzer with a more pleasant tone by just connecting them to the stock "timer box". 

Edited by dmorales-bello

Share this post


Link to post
Share on other sites

Yup. You got it. Here's a pic of the original combo. The timer box is the white plastic covered cube in the center, while the part that actually makes the noise is the smaller nodule on the right with the red and yellow wires terminating in insulted crimp on connectors:
 P1080901_zpszbvx4xtq.jpg

And here's a pic of the original combo again, with the Acura ding-dong in the center of the pic (the two wire device with the orange and black wires):
P1080992_zpsoegpm8qi.jpg

Just connect up the orange and black of the Acura ding-dong to the Y and R coming out of the timer module, and you're good to go.

Only other thing to remember is that since the Acura DD is an electro-mechanical device, the mounting position may be important. I found that if it wasn't level, it would "ding" - "clink" because one of the internal bell chime bars wasn't sitting on it's mount properly. I suspect they're like little xylophone bars inside and if they get cokked to the side, it won't ring properly.

I drilled a new small hole and mounted mine like this (it's upside down). You can see that the original buzzer cube is still there, but is no longer connected:
P1090068_zpssmegkc4g.jpg

But none of this is about the HVAC servos that the thread was started for.   ROFL

Share this post


Link to post
Share on other sites

Darn it capitan you are making me look bad.  I spent probably 3 days rebuilding the hvac control system and its not nearly as nice as your system.

Share this post


Link to post
Share on other sites

Well, there's no reason to feel bad. Mine's a half finished yet to be tested project that hasn't yet seen the road. Still plenty of time for the whole thing to go horribly wrong!  :)

Share this post


Link to post
Share on other sites
6 hours ago, siteunseen said:

Sincerely 

Richard Hertz

Howdy Cousin!!  LOL

Year or three ago I was at a beer festival and they were raffling off some prizes. You filled out the form and put it in the box and they pulled names out later in the evening and announced the winners. I filled out my form as Haywood Jablowme.

They called the winners up on stage. I won a shirt.

It was epic.  :victorious:

All my friends and all the eighth graders in my area still talk about it. It's my second favorite shirt behind the one from Back Forty.

Edited by Captain Obvious
  • Like 2

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

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.