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08-01-2006, 10:31 PM
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#1 |
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GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Is this right? Heater, A/C vacuum line.
This is what the vacuum lines look like on my 72 GMC. Are there only suppose to be 2 lines connected? What is the other one for?
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2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride   http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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08-02-2006, 03:55 AM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Is this right? Heater, A/C vacuum line.
That is the right hookup for your truck. The three port switches were used in the earlier trucks but will work in yours if the one port is plugged.
Attached are the vacuum schematics, the first one applies to your setup and the second one applies to the three port switch. Jim |
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09-24-2006, 06:31 PM
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#3 |
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What are you looking at?
Join Date: Jul 2003
Location: Kellyville,Oklahoma
Posts: 308
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Re: Is this right? Heater, A/C vacuum line.
Where can I get a new or good vacum control switch. Mine is messed up beyond repair. Any vendors have these without buying the entire A/C control assembly?
__________________
1971 GMC LWB 2005 Honda Element 2007 Honda Fit 
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09-25-2006, 10:20 PM
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#4 |
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GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Re: Is this right? Heater, A/C vacuum line.
Try Classic Industries, Year One, Chevy Duty-they changed names, LMC, Manes, Ebay.
__________________
2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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09-26-2006, 08:33 PM
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#5 |
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Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,756
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Re: Is this right? Heater, A/C vacuum line.
A while back when I needed one for my truck the only place I could find one was from a guy who bought a new AC control for his aftermarket AC system which didn't use this vacuum "thing" and was willing to sell it to me for my factory AC.
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'05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer Last edited by badpeanut; 09-26-2006 at 08:38 PM. Reason: Delete banned link. |
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09-26-2006, 09:29 PM
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#6 |
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Registered User
Join Date: May 2004
Location: Topeka, Ks
Posts: 2,293
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Re: Is this right? Heater, A/C vacuum line.
I bought a brand new one a year ago from Ricks pickup parts in AZ (****************.com). They remove them from the control assemblys when they install a vintage air A/C systems in trucks they restore. They said they had a bunch at that time. It was the 3 port version and was $15 plus a little shipping.
Good luck Jeff
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I'm not a pessimist, I'm just optimistic that bad things are going to happen. 1971 Cheyenne Super K10 - tilt, cruise, air, am/fm, tow hooks, factory buckets! 1986 Jeep J10 pickup, - 5.3L Vortec with 4L60e and NP241. |
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09-26-2006, 09:35 PM
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#7 |
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What are you looking at?
Join Date: Jul 2003
Location: Kellyville,Oklahoma
Posts: 308
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Re: Is this right? Heater, A/C vacuum line.
Thanks...I will check them out.
__________________
1971 GMC LWB 2005 Honda Element 2007 Honda Fit
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