Rear A/C wiring diagram - The 1947 - Present Chevrolet & GMC Truck Message Board Network

extremesounds13 · 06-12-2012, 11:43 PM

Does anyone have a wiring diagram for the rear A/C on a 1972 GMC suburban. My manual has one for the front but nothing for the rear. I just picked a burb up and the rear blower doesn't work so I am trying to trace down the problem. Thanks

gcburdic · 06-13-2012, 09:45 AM

found a thread where folks were asking the same question, but no wiring diagram....plenty of ideas on what to check though....

http://67-72chevytrucks.com/vboard/s...d.php?t=503749

gcburdic · 06-13-2012, 03:57 PM

would you happen to have an factory assembly manual??...I just looked at this thread post #9 where they are indexing the very confusing manual and saw that page 548 has a "AC Wiring from Compressor to Roof"....check that too

https://docs.google.com/spreadsheet/...sOXcwVWc#gid=0

extremesounds13 · 06-13-2012, 11:52 PM

unfortunately I don't have an assembly manual. I did see that thread on the A/C last night but my relays look fine. I Just need to know what the wires go to, I only have three wires on the rear A/C switch up front and they all run to the back and plug in to the rear A/C. I am wondering where it gets its power from I would of assumed there would of been a power wire at the switch.

extremesounds13 · 06-18-2012, 01:11 AM

Can anyone tell me how many wires they have on there rear A/C switch that is in the dash? Also does anyone know where the power comes from for the blower in the back?

extremesounds13 · 06-26-2012, 12:55 AM

Alright I finally just tore the whole system apart today from the switch in the dash all the wiring headed back and pulled the unit off the ceiling. Found out that I had no power to the orange which I traced but couldn't figure out the problem so I ran a new one, then there was a bad ground on the blower motor in the back. Once I fixed those two things it worked!!! Now I am wondering if anyone has a pic of the "T" fitting up under the hood where the A/C lines head to the back, the one on the smaller lines is there but the one on the bigger lines is gone. I assume it's just a standard "T" but just wanted to check. Then I will get the system charged and see if it's a go or not.

gcburdic · 06-26-2012, 08:43 AM

Mine is still hooked up, so not sure if a picture of it would help....I assume you are wanting just a pic of the T itself....

extremesounds13 · 06-26-2012, 09:11 PM

hooked up is fine, that would give me an idea of where it goes to. I can see all three lines they are just sitting there and there is no "T"

extremesounds13 · 07-08-2012, 09:07 PM

Gcburdic any luck on a pic? Also I think I want to stay with R12 to get my system charged, but what if I can't find any, or anyone to do it, could I use that freeze 12 stuff or should I just convert?

gcburdic · 07-09-2012, 01:11 PM

Oops...sorry...with the holiday and all I completely forgot...tonight buddy!...I'm not well versed on AC stuff, but if you cannot find R12, the conversion requires you to change all o-rings and a few other items

06-12-2012, 11:43 PM	#1
extremesounds13 Registered User Join Date: Jun 2009 Location: Idaho Falls Idaho Posts: 131	Rear A/C wiring diagram Does anyone have a wiring diagram for the rear A/C on a 1972 GMC suburban. My manual has one for the front but nothing for the rear. I just picked a burb up and the rear blower doesn't work so I am trying to trace down the problem. Thanks

06-13-2012, 09:45 AM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Rear A/C wiring diagram found a thread where folks were asking the same question, but no wiring diagram....plenty of ideas on what to check though.... http://67-72chevytrucks.com/vboard/s...d.php?t=503749 __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

06-13-2012, 03:57 PM	#3
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Rear A/C wiring diagram would you happen to have an factory assembly manual??...I just looked at this thread post #9 where they are indexing the very confusing manual and saw that page 548 has a "AC Wiring from Compressor to Roof"....check that too https://docs.google.com/spreadsheet/...sOXcwVWc#gid=0 __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

06-13-2012, 11:52 PM	#4
extremesounds13 Registered User Join Date: Jun 2009 Location: Idaho Falls Idaho Posts: 131	Re: Rear A/C wiring diagram unfortunately I don't have an assembly manual. I did see that thread on the A/C last night but my relays look fine. I Just need to know what the wires go to, I only have three wires on the rear A/C switch up front and they all run to the back and plug in to the rear A/C. I am wondering where it gets its power from I would of assumed there would of been a power wire at the switch.

06-18-2012, 01:11 AM	#5
extremesounds13 Registered User Join Date: Jun 2009 Location: Idaho Falls Idaho Posts: 131	Re: Rear A/C wiring diagram Can anyone tell me how many wires they have on there rear A/C switch that is in the dash? Also does anyone know where the power comes from for the blower in the back?

06-26-2012, 12:55 AM	#6
extremesounds13 Registered User Join Date: Jun 2009 Location: Idaho Falls Idaho Posts: 131	Re: Rear A/C wiring diagram Alright I finally just tore the whole system apart today from the switch in the dash all the wiring headed back and pulled the unit off the ceiling. Found out that I had no power to the orange which I traced but couldn't figure out the problem so I ran a new one, then there was a bad ground on the blower motor in the back. Once I fixed those two things it worked!!! Now I am wondering if anyone has a pic of the "T" fitting up under the hood where the A/C lines head to the back, the one on the smaller lines is there but the one on the bigger lines is gone. I assume it's just a standard "T" but just wanted to check. Then I will get the system charged and see if it's a go or not.

06-26-2012, 08:43 AM	#7
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Rear A/C wiring diagram Mine is still hooked up, so not sure if a picture of it would help....I assume you are wanting just a pic of the T itself.... __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

06-26-2012, 09:11 PM	#8
extremesounds13 Registered User Join Date: Jun 2009 Location: Idaho Falls Idaho Posts: 131	Re: Rear A/C wiring diagram hooked up is fine, that would give me an idea of where it goes to. I can see all three lines they are just sitting there and there is no "T"

07-08-2012, 09:07 PM	#9
extremesounds13 Registered User Join Date: Jun 2009 Location: Idaho Falls Idaho Posts: 131	Re: Rear A/C wiring diagram Gcburdic any luck on a pic? Also I think I want to stay with R12 to get my system charged, but what if I can't find any, or anyone to do it, could I use that freeze 12 stuff or should I just convert?

07-09-2012, 01:11 PM	#10
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Rear A/C wiring diagram Oops...sorry...with the holiday and all I completely forgot...tonight buddy!...I'm not well versed on AC stuff, but if you cannot find R12, the conversion requires you to change all o-rings and a few other items __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

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