Author Topic: A/C heater Vacuum lines-> help needed (Read 8607 times)

DMZ73 · « **on:** March 21, 2012 - 08:29:42 PM »

Re: Vac lines for Ac/heater control
� Reply #1 on: June 29, 2011 - 07:33:19 PM �
Quote
the line enters the engine bay through a hole in the firewall under the heater hose connection , I think the other end connects to the switch plug
Chryco

I have the heater/AC vacuum lines hooked up, and have no visual reference for how /what the lines draw vacuum from.
anyone have a pic of what it's supposed to look like/connect to?
Thanks in advance!
Dan

thedodgeboys · « **Reply #1 on:** March 22, 2012 - 06:14:51 AM »

Dan
The line that goes through the hol in the firewall is routed to the vacuume push button switch on the dash.
The other end is connected to a vacuumed port on the intake manifold on the motor.
From the switch the lines go back to all the vacuume pods.

But I think you know that part, are you wanting to know what lines go to what port?

DMZ73 · « **Reply #2 on:** March 22, 2012 - 10:39:33 PM »

Thanks Scott, I just don't know wherethe vacuum hose goes out the firewall.
I spoke to steve today, and he mentioned I should have a bung off the intake manifold that comes off the intake manifold..
the key here being should...because I don't..

Just tryin to get it right..

Dan

swede-cuda · « **Reply #3 on:** March 24, 2012 - 12:28:54 PM »

hej.the small vacuum hose enters the engine bay through a rubber grommet(if the grommet have 2 holes then also the cable for the water valve goes through it) ,the grommet mounts to the firewall with 3 screws,so look at your firewall where chryco said,for a bigger hole with 3 screw holes around it.

. ok,then on my 70 383 4sp the tiny hose connects at a tee behind the carb,where 1 hose goes to the pod stuff on the dual snorkel air cleaner,and the ac tiny whiny hose connects at the passengerside rear of the carb base plate.its just a pipe in the base plate,just like a distributor vacuum connection in the base plate.i guess you can connect it anywhere as long as it gets full vacuum.if you dont have a chrysler/correct carb then maybe drill a hole in a spacer plate an put a fitting in it for the vacuum hose.

Katfish · « **Reply #4 on:** March 24, 2012 - 12:31:20 PM »

Passenger side near bottom

DMZ73 · « **Reply #5 on:** March 26, 2012 - 06:56:59 AM »

Thanks Katfish!
The firewall picture is extremely informative.

I do have a few other dumb questions.
1. What diameter tubing comes out of the firewall to meet the vacuum port?
(the diameter tube coming off the vacuum "pots" is 1/4". Is this correct?
What is the overall length of the vacuum hose?
2. What does the HVAC vacuum tube grommet look like?
3.I have, or am supposed to have a manual footpump washer system.
I see a footpump hole in the firewall. What does a manual footpump system look like?
4.What does the footpump grommet look like?

Thanks again!
Dan Zimmermann

swede-cuda · « **Reply #6 on:** March 27, 2012 - 02:55:46 PM »

good luck

FY1Cuda · « **Reply #7 on:** March 27, 2012 - 06:20:16 PM »

You can get the vacuum for the AC from the manifold if the tap for the power brakes (I'm assuming you have power brakes if you have AC) has a little nipple like show in the first picture. You can also tap off of the power brake booster if you have a plastic plug with the small nipple like in the second picture (our's is capped off). The following link from Moparts shows you the grommet and explains a few things:

http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=4593103&an=0&page=564

DMZ73 · « **Reply #8 on:** March 28, 2012 - 12:27:19 PM »

Thanks !
Nice link, and very informative thread. I guess I missed that lil guy in my HVAC resto.

So here's what I have so far:
This is the grommet for the HVAC Vacuum tube.

It clearly shows the proper vacuum hose scale, however, the nipple port on the Power Brake Booster is 1/4", and the nipple port ont the vacuum pot is also 1/4"

Here is the vacuum pot setup "original" to my car

Right now, I have my Heater cable coming through this foot pump hole with a grommet of unknown origin.
I am also running my Oil pressure line through the same grommet

I see an option to run a vacuum nipple here:

And through the firewall in the "correct" location

If you look at the pics of my engine bay when I recieved the car, you will notice that the vacuum line was in fact on the Power Brake Booster.
http://www.pbase.com/dmz73/image/65717750

It really doesn't matter where I hook up to get vacuum, however, I would like to know if it is OK to run the 1/4" vacuum line, or if I need to reduce it.

I also found a few nice reference shots of the vacuum tube routing.
http://s617.photobucket.com/albums/tt251/dmz73/?action=view&current=b3b28ffb.jpg
http://s617.photobucket.com/albums/tt251/dmz73/?action=view&current=a669e953.jpg

Here's my Engine bay Before:
http://www.pbase.com/dmz73/image/65717756
Here is my Engine Bay today:

Another dumb question.
I have a new engine bay harness. What does the "blue" Compressor wire hook up to?
Does it hook up to the brown wire?

Best,

Dan

Author Topic: A/C heater Vacuum lines-> help needed (Read 8607 times)

DMZ73

A/C heater Vacuum lines-> help needed

thedodgeboys

Re: A/C heater Vacuum lines-> help needed

DMZ73

Re: A/C heater Vacuum lines-> help needed

swede-cuda

Re: A/C heater Vacuum lines-> help needed

Katfish

Re: A/C heater Vacuum lines-> help needed

DMZ73

Re: A/C heater Vacuum lines-> help needed

swede-cuda

Re: A/C heater Vacuum lines-> help needed

FY1Cuda

Re: A/C heater Vacuum lines-> help needed

DMZ73

Re: A/C heater Vacuum lines-> help needed