A/C Vacuum can question - Team Camaro Tech
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post #1 of 11 (permalink) Old Aug 11th, 11, 06:50 PM Thread Starter
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A/C Vacuum can question

I have a factory A/C car with the vacuum can attached to the firewall under the driver's fender. Where does the vacuum line from this can attach, on the intake manifold or the carburetor?

It looks like I can get a fitting for the intake manifold that has two ports one is needed for my power brake booster. Is the other used for the AC can or do I need to splice the vacuum line coming off the carb that goes to my PCV valve? My 67 RS/SS has an original intake manifold and Rochester carb. I could not find the attachment of this AC line in the AIM. Thanks for the help.

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post #2 of 11 (permalink) Old Aug 11th, 11, 07:11 PM
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Re: A/C Vacuum can question

I have an AIM for my 67. It shows on page 201 that the hose goes to the port on the intake manifold.
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post #3 of 11 (permalink) Old Aug 12th, 11, 05:05 PM Thread Starter
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Re: A/C Vacuum can question

Page 201 in my AIM is UPC C60 - A5 and it shows the air conditioning plenum valve. It doesn't show where the line from the vacuum can goes. Any body know what was the original factory setup?

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post #4 of 11 (permalink) Old Aug 12th, 11, 05:15 PM Thread Starter
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Re: A/C Vacuum can question

Is it on page 242? What I think is correct is view A RPO C60 The larger hose goes to the power brake booster and the smaller one pointed toward the passenger side goes to the vacuum can. Is that right?

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post #5 of 11 (permalink) Old Aug 12th, 11, 06:49 PM
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Re: A/C Vacuum can question

On a V8, vacuum source comes from a nipple on the connector on the intake runner just in front of the dist. Same place/connector the vac modulator for an automatic trans gets its source, just another nipple, a dual nipple connector.
Brake booster has its own large nipple from the intake plenum under the rear center of the carb.

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post #6 of 11 (permalink) Old Aug 13th, 11, 06:29 PM Thread Starter
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Re: A/C Vacuum can question

Thanks Everett. I do not have a nipple on the intake plenum under the rear center of my 4 bbl Rochester. There is one on the front for the crankcase vent that is behind the distributor. Maybe I am not looking in the right place.

The AIM shows a threaded connector for my brake booster that is facing the opposite direction of the nipple on that connector that is just in front of the distributor on the intake manifold. Rick's shows it as part INT-7. I think that may be the part I need.

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post #7 of 11 (permalink) Old Aug 14th, 11, 06:56 AM
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Re: A/C Vacuum can question

My vac can comes off the back of the intake as folks have said, pic shows it here:


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post #8 of 11 (permalink) Old Aug 14th, 11, 02:27 PM Thread Starter
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Re: A/C Vacuum can question

Thanks Jim. That shows it nicely. It looks like your brake booster comes off the same connector. I guess I need to buy one of those connectors. Mine just has a port for the brake booster.

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post #9 of 11 (permalink) Old Aug 14th, 11, 09:12 PM
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Re: A/C Vacuum can question

Its just apox. 1.5" Tall 'T' with threaded end and 3 barbed bibs, one large for the brake booster and 2 smaller ones for the vac hoses

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post #10 of 11 (permalink) Old Aug 15th, 11, 10:04 AM Thread Starter
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Re: A/C Vacuum can question

Jim I know yours is a 69 and probably set up differently than mine but where does your third vacuum line go? The large one is for the brake booster (my 67 has a threaded brake booster port), one of the two smaller lines goes to the vac can (the subject of this thread) but were does your third vacuum line go? I thought the third one was for an automatic transmission but isn't yours a 4speed? Maybe smog related?

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post #11 of 11 (permalink) Old Aug 15th, 11, 11:02 AM
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Re: A/C Vacuum can question

I have 700r automatic tranny

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