Another AC Vacuum question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KellerMAC · 07-01-2012, 08:15 PM

I am trying to find a good and strong source for the vacuum of my AC unit in my 72 C10 with factory air.

I need to run the hose from the vacuum tank under my dash to provide vacuum and was wondering which way would work best?

I have two choices - (1) use a T and tap into the main line from the valve cover and the carb (2) use a T and tap into the vacuum advance of the distributor. What is your opinion - see two pictures below.

Thanks for your help,

KellerMac

**med.bronze** · 07-01-2012, 08:18 PM

use the intake manifold vacuum in the second picture

KellerMAC · 07-01-2012, 09:40 PM

Thanks med.bronze - does it matter which hose off the manifold that I hook to?

**med.bronze** · 07-01-2012, 09:43 PM

no it shouldn't, but it might be better to put a 3-port vacuum fitting on the manifold.

07-01-2012, 08:15 PM	#1
KellerMAC Registered User Join Date: Jan 2007 Location: Keller, TX Posts: 143	Another AC Vacuum question I am trying to find a good and strong source for the vacuum of my AC unit in my 72 C10 with factory air. I need to run the hose from the vacuum tank under my dash to provide vacuum and was wondering which way would work best? I have two choices - (1) use a T and tap into the main line from the valve cover and the carb (2) use a T and tap into the vacuum advance of the distributor. What is your opinion - see two pictures below. Thanks for your help, KellerMac Attached Images __________________ Texas - Don't Let The Size Scare You!

07-01-2012, 08:18 PM	#2
med.bronze Senior Member Join Date: Dec 2011 Location: Laurel, Mt. Posts: 522	Re: Another AC Vacuum question use the intake manifold vacuum in the second picture __________________ 1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom

07-01-2012, 09:40 PM	#3
KellerMAC Registered User Join Date: Jan 2007 Location: Keller, TX Posts: 143	Re: Another AC Vacuum question Thanks med.bronze - does it matter which hose off the manifold that I hook to? __________________ Texas - Don't Let The Size Scare You!

07-01-2012, 09:43 PM	#4
med.bronze Senior Member Join Date: Dec 2011 Location: Laurel, Mt. Posts: 522	Re: Another AC Vacuum question no it shouldn't, but it might be better to put a 3-port vacuum fitting on the manifold. __________________ 1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom



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