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#1 |
II Timothy 4:2
Join Date: Mar 2005
Location: Fort Worth
Posts: 361
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AC Controls question
I just got a new set of AC Controls (thanks pjmoreland!) for my 72 C-20 and had a question about the vacuum port thing on the top of the assembly. Here is a picture of the new one I just got (picture stolen from pjmoreland's thread):
Here is a picture of the one I took out of my truck (ignore the red parts, they were put there when I was looking for a new top lever): As you can see from the top picture, there are three vacuum hose connections on the new one, as opposed to my assembly, which has two connections. Can anybody tell me why? Should I just take that part off of my old assembly and use it on the new one? Where does that other hose go? I'm pretty sure that the line controls the fresh air vent vacuum pod, but I don't know what the third mystery line is for. Thanks
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72 C-20 2WD LWB Custom Camper Deluxe 350 4 Speed "Project Lazarus" MY TRUE PRIDE AND JOY "Dangit, Bobby, people will see that oil stain and think I'm a drunk." |
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#2 |
Lovin' Life in Miss.!
Join Date: Mar 2004
Location: Puckett, Mississippi
Posts: 1,937
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Interesting. I don't have my vacume diagram handy here at work... Will bring it tomarrow and try to help if no one else has.
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The truck... you hear that? No really, you did hear that?!!! |
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#3 |
Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,474
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here is a thread on the ports...http://67-72chevytrucks.com/vboard/s...threadid=66112
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires |
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#4 |
II Timothy 4:2
Join Date: Mar 2005
Location: Fort Worth
Posts: 361
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Did they combine the vacuum hoses on 72s?
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72 C-20 2WD LWB Custom Camper Deluxe 350 4 Speed "Project Lazarus" MY TRUE PRIDE AND JOY "Dangit, Bobby, people will see that oil stain and think I'm a drunk." |
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#5 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,527
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Those A/C controls you got from me are out of a 72 GMC.
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#6 | |
II Timothy 4:2
Join Date: Mar 2005
Location: Fort Worth
Posts: 361
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Quote:
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72 C-20 2WD LWB Custom Camper Deluxe 350 4 Speed "Project Lazarus" MY TRUE PRIDE AND JOY "Dangit, Bobby, people will see that oil stain and think I'm a drunk." |
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#7 |
Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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jtminton
Maybe these will help
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John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS |
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#8 |
Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,756
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My '72 GMC w/air has two ports. When it started leaking the replacement I got has three; haven't put this in, yet.
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#9 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,553
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On my gmc # 1 is the vacuum source. #2 goes to all the vac doors with vac. tees and #3 goes to the heater hose valve.
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