Need diagrams/schematics/pics for stock A/C - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**CPNE** · 08-28-2006, 10:28 AM

For a 67/68

1. Routing of vacuum lines
2. Routing of wiring harness to connectors
3. Routing of cables from heater/ac control

Thanks

sneakysnake · 08-28-2006, 12:47 PM

This is all I have

**CPNE** · 08-28-2006, 01:29 PM

Thanks

**CPNE** · 08-29-2006, 10:27 AM

Those diagrams help alot, but the a/c control I have has only 2 vacuum connections in the area circled that shows 3. I assume this is a 67/68 vs 69-72 difference. Anybody have similar diagrams for 67/68 a/c setup? Or is there a 3rd port on the a/c controller I have that is not apparent to me?

BobbyK · 08-29-2006, 10:35 AM

In the earier versions the vacume line goig to the kick panel vacume pod is "T'd" about midway under the dash.
The T'd line goes to water shut off valve on the pass. side fenderwell. It's possible the 67/68's didn't have that shut-off valve and that's why you only have 2 ports on the back of the selector switch.

**CPNE** · 08-30-2006, 10:08 AM

Quote:

Originally Posted by BobbyK

In the earier versions the vacume line goig to the kick panel vacume pod is "T'd" about midway under the dash.
The T'd line goes to water shut off valve on the pass. side fenderwell. It's possible the 67/68's didn't have that shut-off valve and that's why you only have 2 ports on the back of the selector switch.

I suppose that is possible, but 67/68 has a year specific shutoff valve if I recall correctly.

Anybody with a 67/68 assembly manual or a STOCK A/C truck? If so any pics and/or explanation of whats going on with the vacuum lines is appreciated.

68SHORTBOX · 08-30-2006, 10:26 AM

The control head vacuum switch on the 68 has only 2 connections. One from the vacuum reservoir to the control head vacuum switch and the other to the recirculated air door diaphragm (door open when vacuum is applied), this line has a tee about midway which goes to the outside air door diaphragm (door closed when vacuum is applied). the other line on the vacuum reservoir goes to the vacuum source on engine. Hope this helps will look and see if I have a diagram of the whole system.

**CPNE** · 08-30-2006, 10:42 AM

Quote:

Originally Posted by 68SHORTBOX

The control head vacuum switch on the 68 has only 2 connections. One from the vacuum reservoir to the control head vacuum switch and the other to the recirculated air door diaphragm (door open when vacuum is applied), this line has a tee about midway which goes to the outside air door diaphragm (door closed when vacuum is applied). the other line on the vacuum reservoir goes to the vacuum source on engine. Hope this helps will look and see if I have a diagram of the whole system.

So you are confirming what BobbyK indicated that there is no water shutoff valve? Basically one line for vacuum in and the other operates the fresh air vent on the outer cowl and kick vanel vent? Which is which on the a/c control assembly? If you can supply a pic of the diagram I'd appreciate it

68SHORTBOX · 08-30-2006, 12:50 PM

Here is some of the diagrams from the 68 assembly manual

68SHORTBOX · 08-30-2006, 12:52 PM

Send me your email and I will PM you with more info and scans of the manual

Regards

**CPNE** · 08-30-2006, 01:08 PM

Done. This info is extremely helpful and appreciated!

**CPNE** · 08-30-2006, 03:24 PM

Thanks to both sneakysnake and 68shortbox. I now have the info I need! I tried to give rep points but for some reason it didn't let me

tjvending · 01-10-2008, 03:29 PM

Can someone send me the schematics for the Heater-AC control system for my 72 chevy shortbed?

TJ

Rickettsjt@hotmail.com

HavinSomeFun · 01-10-2008, 03:33 PM

Its information like this that makes the $25 fee seem cheap!

08-28-2006, 10:28 AM	#1
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Need diagrams/schematics/pics for stock A/C For a 67/68 1. Routing of vacuum lines 2. Routing of wiring harness to connectors 3. Routing of cables from heater/ac control Thanks __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

08-28-2006, 12:47 PM	#2
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: Need diagrams/schematics/pics for stock A/C This is all I have Attached Images

08-28-2006, 01:29 PM	#3
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Re: Need diagrams/schematics/pics for stock A/C Thanks __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

08-29-2006, 10:27 AM	#4
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Re: Need diagrams/schematics/pics for stock A/C Those diagrams help alot, but the a/c control I have has only 2 vacuum connections in the area circled that shows 3. I assume this is a 67/68 vs 69-72 difference. Anybody have similar diagrams for 67/68 a/c setup? Or is there a 3rd port on the a/c controller I have that is not apparent to me? Attached Images __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

08-29-2006, 10:35 AM	#5
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,771	Re: Need diagrams/schematics/pics for stock A/C In the earier versions the vacume line goig to the kick panel vacume pod is "T'd" about midway under the dash. The T'd line goes to water shut off valve on the pass. side fenderwell. It's possible the 67/68's didn't have that shut-off valve and that's why you only have 2 ports on the back of the selector switch. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

08-30-2006, 10:26 AM	#7
68SHORTBOX Registered User Join Date: Jul 2006 Location: El Cajon Ca Posts: 84	Re: Need diagrams/schematics/pics for stock A/C The control head vacuum switch on the 68 has only 2 connections. One from the vacuum reservoir to the control head vacuum switch and the other to the recirculated air door diaphragm (door open when vacuum is applied), this line has a tee about midway which goes to the outside air door diaphragm (door closed when vacuum is applied). the other line on the vacuum reservoir goes to the vacuum source on engine. Hope this helps will look and see if I have a diagram of the whole system. Last edited by 68SHORTBOX; 08-30-2006 at 10:28 AM. Reason: more info

08-30-2006, 12:50 PM	#9
68SHORTBOX Registered User Join Date: Jul 2006 Location: El Cajon Ca Posts: 84	Re: Need diagrams/schematics/pics for stock A/C Here is some of the diagrams from the 68 assembly manual Last edited by 68SHORTBOX; 02-08-2007 at 08:43 PM.

08-30-2006, 12:52 PM	#10
68SHORTBOX Registered User Join Date: Jul 2006 Location: El Cajon Ca Posts: 84	Re: Need diagrams/schematics/pics for stock A/C Send me your email and I will PM you with more info and scans of the manual Regards

08-30-2006, 01:08 PM	#11
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Re: Need diagrams/schematics/pics for stock A/C Done. This info is extremely helpful and appreciated! __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

08-30-2006, 03:24 PM	#12
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Re: Need diagrams/schematics/pics for stock A/C Thanks to both sneakysnake and 68shortbox. I now have the info I need! I tried to give rep points but for some reason it didn't let me __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

01-10-2008, 03:29 PM	#13
tjvending Registered User Join Date: Oct 2007 Location: rockville, md Posts: 257	Re: Need diagrams/schematics/pics for stock A/C Can someone send me the schematics for the Heater-AC control system for my 72 chevy shortbed? TJ Rickettsjt@hotmail.com

01-10-2008, 03:33 PM	#14
HavinSomeFun Still Just Havin Some Fun! Join Date: Jun 2007 Location: Piedmont, Oklahoma Posts: 1,145	Re: Need diagrams/schematics/pics for stock A/C Its information like this that makes the $25 fee seem cheap! __________________ a green one with some stuff done to it....

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