Engine vacuum

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Engine vacuum

Post by builtnotbought on Thu Jan 28, 2016 4:16 pm

Hello I have a question about one thing, it's circled red and I guess it is a vacuum tank.




I wonder for what this tank is used in stock vacuum system and do I need it now. When I bought the car my vacuum system was routed like this - power booster line in carb, th350 line with T-fitting to carb and to these strange round tank. Only one port was used in tank.

Now I have new 383 engine with edelbrock carb and stock th350. I will connect power booster to carb and th350 line to carb. Do I need this vacuum tank in the system?

Thank you for help!
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Re: Engine vacuum

Post by Joe73 on Thu Jan 28, 2016 4:18 pm

That is a vacuum reserve canister used on a/c cars to assist in operating the dash heating and a/c controls.
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Re: Engine vacuum

Post by builtnotbought on Thu Jan 28, 2016 4:31 pm

Joe73 wrote:That is a vacuum reserve canister used on a/c cars to assist in operating the dash heating and a/c controls.

Thank you for the info.. My A/c was shutted off and now I will not have it anymore.
Do I need this canister for heater flaps normal operating?
Hmm, and where does the main vacuum line to heater run? It seems I didn't have it at all...
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Re: Engine vacuum

Post by Joe73 on Thu Jan 28, 2016 5:14 pm

Yes you will need it for the vent doors. Someone will post up as to where it gets vacuum from. The non a/c cars are cable actuated.
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Re: Engine vacuum

Post by builtnotbought on Thu Jan 28, 2016 5:22 pm

Joe73 wrote:Yes you will need it for the vent doors.  Someone will post up as to where it gets vacuum from.  The non a/c cars are cable actuated.
Wow, thank you for improving my knowledge! Yes vacuum scheme or some pics will be great!
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Re: Engine vacuum

Post by Hawk03 on Thu Jan 28, 2016 5:46 pm

Here some more info.


Credit Mcarlo77

http://www.g3gm.com/t7015-climate-control-vacuum-lines
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Re: Engine vacuum

Post by builtnotbought on Thu Jan 28, 2016 5:50 pm

Cool, thank you very much!
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Re: Engine vacuum

Post by builtnotbought on Mon Feb 22, 2016 5:29 pm

I started to sort out things with my lost vacuum pipes and realize that my 74 connector has 8 pipes instead of 7 as on the pic. And I don't have brown pipe with tee to water valve at all.
AC is deleted on car now.
I have 3 pipes running outside of the interior, I guess 1 for vacuum ball, 1 for vacuum ball with tee to carb and one more free, that may be went to water gauge. Ofcoarse I don't know which is for what=)

May be anybody have earlier 73-75 diagrams on photo?

Thank you
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Re: Engine vacuum

Post by Mcarlo77 on Tue Feb 23, 2016 3:26 pm

Demid...I think this information will clear up the mystery of your eighth vacuum tube.  I have a '74/'75 temp control A$$'y and compared it to the schematic shown here in this thread for '76/'77.  The only difference is that the Green/Black tube with the tee for the Brown tube running out to the water valve is non-existent.  Instead, they added a Brown tube from the plug connector (your eighth tube) that runs out to the water valve.  In place of the Green/Black tube, they ran the Orange/Black tube from the plug.  Otherwise, everything is the same as with '76/'77.  Now...keep in mind the Brown hose is more of a Caramel color.  Here are a couple pics to show all eight tubes:



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Re: Engine vacuum

Post by builtnotbought on Tue Feb 23, 2016 5:13 pm

Thank you very much!
Your tubes on photos are so colorful like new, mine are faded.
I will check everything.
So if I shut down the AC and have no water valve now I need to plug this brown tube to make everything work correct as it can, am I right?

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Re: Engine vacuum

Post by Mcarlo77 on Tue Feb 23, 2016 5:31 pm

I would say that is right.
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Re: Engine vacuum

Post by builtnotbought on Tue Mar 08, 2016 2:25 pm

Mcarlo77 wrote:I would say that is right.

As you told in the other thread:
"To be more specific on what goes where...there are three small hoses coming from the firewall. The one with a brown stripe goes to the water control valve. The one with a white stripe goes to the vacuum ball. Third one is fitted with a three-way hose nipple that allows a larger size hose to go to the vacuum valve on the intake manifold (as Pila mentioned) and another larger hose to the second fitting on the vacuum ball."

I cleaned my lines and I think I have something near this case that you mentioned above. Black with White stripe for sure, full Black fo sure and Black with smth like Grey stripe (or may be it was brown sometimes).  


So combining all info, written and from scheme I should connect BLK/WH to ball, full BLK to Ball + carb vacuum port, BLK/GR is going to water valve and must be closed.

Am I right?
Thank you!
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Re: Engine vacuum

Post by Hs1973 on Tue Mar 08, 2016 2:48 pm

You write you are running your trans Line to carb. Usually it connects not to carb, but to a fittings in the back of the manifold just behind carb and in front of the distributor. I could be Wrong but tjats the Way all of mine has been connected over the years. The to front vacumpprts on the carb is for the distributor, wich one depending on your setup. The brakebooster connects to the carb in the back. Someone correct me If im wrong.
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Re: Engine vacuum

Post by builtnotbought on Tue Mar 08, 2016 3:17 pm

Hs1973 wrote:You write you are running your trans Line to carb. Usually it connects not to carb, but to a fittings in the back of the manifold just behind carb and in front of the distributor. I could be Wrong but tjats the Way all of mine has been connected over the years. The to front vacumpprts on the carb is for the distributor, wich one depending on your setup. The brakebooster connects to the carb in the back. Someone correct me If im wrong.
Thank you for advice! I will check this info!
My edelbrock has 2 ports in the front.
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Re: Engine vacuum

Post by Mcarlo77 on Wed Mar 23, 2016 2:48 pm

As for the vacuum lines...I found the source of your confusion. You are correct, afterall, in that there is a Black, Black/Gray and Black/White hose coming out of the firewall. What I didn't know until I looked closer at the hoses running off my Temp Control is that the Brown hose I spoke about that is to run to the water valve transitions to a Black/White hose (for whatever reason) at the plug connection behind the dash. In other words, Brown hose from Temp Control to plug...then, Black/White from plug to engine compartment. So, Black/White hose runs to water valve, Black/Gray to vacuum ball and Black runs to a tee where it splits off into two (2) larger Black/White hoses...one goes to engine vacuum tree/nipple on intake manifold behind the carb...and, other goes to vacuum ball. Sorry I didn't catch that earlier. Those hoses are cut on my '75 Laguna, so it wasn't readily apparent by looking at it. Anyway, hope this explains everything.
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Re: Engine vacuum

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