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

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.