Vacuum lines

[mopar951]

Hi guys I have a question I have a 1970 duster with ac and I have three vacuum lines that are coming out of the firewall and I would like to know where they go ?

 

[1968FormulaS340]

I believe one goes to engine vacuum and 2 go to the hot water valve. Are they color coded?

 

[mopar951]

Yes only one and it's red

 

[mopar951]

Yes one is color coded

 

[straightlinespeed]

This diagram is out of a 71 service manual. Im not sure if its close to yours, but thought it might be able to help.
View attachment IMG_20140101_201841_398.jpg

 

[mopar951]

That's what I'm looking for but can u send me that pic again to my phone cuz it's hard to zoom in on that pic my num is 951 275 2151

 

[mopar951]

Also does it look like there's three vacuum lines in that service manual?

 

[straightlinespeed]

That's what I'm looking for but can u send me that pic again to my phone cuz it's hard to zoom in on that pic my num

I sent you a text. Just a FYI, your not suppose to post your contact info on the public forum. Send PMs next time.

 

[straightlinespeed]

Also does it look like there's three vacuum lines in that service manual?

I can take a look in the service manual tomorrow but here is a link for the 70 manual in pdf form. Save this to your computer.

http://www.mymopar.com/downloads/servicemanuals/1970_Plymouth_Service_Manual.zip


You can also try this to see if it helps.

http://www.forabodiesonly.com/mopar/showthread.php?t=159583

 

[mopar951]

Ok thanks I really appreciate it talk to u tom

 

[mopar951]

Hi did u get around to looking at the service manual for the vacuum lines?

 

[straightlinespeed]

The service manual didnt have any other good pictures. I do have a pic of my car, I will send it over in a text soon.

From what I can see and recall, One larger vacuum line ran from the canister to the vacuum fitting on the intake (stayed in the engine bay). Thru the fire wall, one line went to the heater hose valve, the other to the other port on the vacuum canister. That appears to be the only 2 lines I have coming thru the fire wall that I can tell on my pic.

 

[clhyer]

I checked my '72 this evening. It only has 2 lines thru the firewall and is set up like straightlinespeed has drawn out.
C

 

[straightlinespeed]

Found this also, might be worth a shot. Although, everything Im seeing on the net only has 2 vacuum lines coming thru the firewall.

http://www.slantsix.org/forum/viewtopic.php?t=46708&sid=ce32215eb7161339e35184e759125457

 

[norshorblufish]

Don't know if this helps. It's from a 68 service manual for a 273 Valiant.
318 and 340 should be the same.

I don't know if they made changes for the Duster or not. It's the way my 68 Barracuda 318 should be set up with the 3 vacuum hoses.
I don't know what year they started using the vacuum reservoir that would only have 2 vacuum hoses through the fire wall.

If one of the vacuum lines has a hard plastic end that goes to the vacuum source at the engine.
It maybe a totally different setup.
Maybe someone with a 70 Duster with A/C will chime in.



Here's a rough sketch.
View attachment scan0002.jpg

 

[mopar951]

That's what I'm looking for thank u soooo much for u taking the time to draw that sketch for me I really appreciate it!

 

[1970-dart]

I have a factory a/c car and all the ac stuff was gone and no heater hoses. i really dont want to change the heater box and i am trying to figure out the whole vacuum thing. I also have three hoses coming out of the firewall but dont have the thing that originally went on the inner fender or ( if there was one)one in the heater hose/s.

Do i need to find one that goes on the inner fender and replace it and maybe one in the heater hose for those vacuum lines to connect to. Or can I just block the two ( red and white striped ones) and connect the solid ( no colored stripe) black one to vacuum and just run the heater hoses the way they would go normally



thanks