AC Harness replacement??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JMac11 · 02-02-2011, 04:52 PM

Anyone replaced just the AC part of the harness?

rsavage · 02-02-2011, 07:55 PM

The harness is available separately and is basically plug and play. I put a new one in my 70 shortbed a couple of years ago when I restored it. Actually replaced all the harnesses. I'm currently stripping my Blazer to get it ready for body shop and was removing components and AC harness yesterday.

**Classic Heartbeat** · 02-02-2011, 08:54 PM

I have done it 3 or 4 time in the last year..

WES

JMac11 · 02-02-2011, 09:36 PM

Guess I am being thick headed over this..... I have a really nice harness out of a heater only truck, the service manual isn't clear but looks like you use the same power feed to the switch in the AC harness and upgrade the fuse in the panel. Guess I will by the ac harness and it will become clearer. The AC Harness( the whole harness honestly) Looks like Larry Moe and Curly supervised Ray Charles rewing it.

**Classic Heartbeat** · 02-02-2011, 10:12 PM

The heater harness has different and fewer plugs than the A/C harness. The A/C harness hooks into the main underdash just like the heater harness, but that is the only simmelarity.
Heater harness: Brown wire from under dash harness slips into a port on the heater motor switch, then goes on to plug into the resister in the ducting, and finaly on to the heater motor under the hood.
A/C harness: Brown wire from under dash harness slips into a port on the heater motor switch, (witch is different than the non A/C switch) then goes on to plug into the resister in the heater core box, then part of the harness splits and goes to the high speed fan relay, while the other group of wires go through the firewall to connect to the blower motor, and A/C pump. WES

JMac11 · 02-02-2011, 10:59 PM

Brown wire gets removed from old heater switch connector, reinstall into the AC harness connector?

**Classic Heartbeat** · 02-02-2011, 11:16 PM

yes. WES

**Classic Bowties** · 02-03-2011, 06:33 PM

Quote:

Originally Posted by JMac11

Guess I am being thick headed over this..... I have a really nice harness out of a heater only truck, the service manual isn't clear but looks like you use the same power feed to the switch in the AC harness and upgrade the fuse in the panel. Guess I will by the ac harness and it will become clearer. The AC Harness( the whole harness honestly) Looks like Larry Moe and Curly supervised Ray Charles rewing it.

Hey JMac, not sure if this will just muddy the waters any more for you or help make it more clear. Here are some pictures of a new unused AC harness #35260 made by American Autowire, its $100. harness on their website. It came in with a project truck that is not going to be built, if you still need to buy one it's yours for $80. shipped. Mel

71 super · 02-03-2011, 09:08 PM

Mel if he decides against it I would like a chance for it. Just let me know if it gets to me. Thanks, Harold

JMac11 · 02-04-2011, 10:20 AM

PM Sent, will take it..... Thanks for all the help

cwilkie · 05-09-2016, 02:12 AM

Hi Wes. Do you have the order they go in on the fan speed switch?

cwilkie · 05-09-2016, 02:13 AM

Here are the four wires I have.

02-02-2011, 04:52 PM	#1
JMac11 Registered User Join Date: May 2005 Location: Tallahassee Fl Posts: 773	AC Harness replacement??? Anyone replaced just the AC part of the harness?

02-02-2011, 07:55 PM	#2
rsavage Registered User Join Date: Aug 2009 Location: Alden NY Posts: 2,705	Re: AC Harness replacement??? The harness is available separately and is basically plug and play. I put a new one in my 70 shortbed a couple of years ago when I restored it. Actually replaced all the harnesses. I'm currently stripping my Blazer to get it ready for body shop and was removing components and AC harness yesterday. __________________ 1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7

02-02-2011, 09:36 PM	#4
JMac11 Registered User Join Date: May 2005 Location: Tallahassee Fl Posts: 773	Re: AC Harness replacement??? Guess I am being thick headed over this..... I have a really nice harness out of a heater only truck, the service manual isn't clear but looks like you use the same power feed to the switch in the AC harness and upgrade the fuse in the panel. Guess I will by the ac harness and it will become clearer. The AC Harness( the whole harness honestly) Looks like Larry Moe and Curly supervised Ray Charles rewing it.

02-02-2011, 10:12 PM	#5
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: AC Harness replacement??? The heater harness has different and fewer plugs than the A/C harness. The A/C harness hooks into the main underdash just like the heater harness, but that is the only simmelarity. Heater harness: Brown wire from under dash harness slips into a port on the heater motor switch, then goes on to plug into the resister in the ducting, and finaly on to the heater motor under the hood. A/C harness: Brown wire from under dash harness slips into a port on the heater motor switch, (witch is different than the non A/C switch) then goes on to plug into the resister in the heater core box, then part of the harness splits and goes to the high speed fan relay, while the other group of wires go through the firewall to connect to the blower motor, and A/C pump. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys Last edited by Classic Heartbeat; 02-02-2011 at 10:13 PM.

02-02-2011, 10:59 PM	#6
JMac11 Registered User Join Date: May 2005 Location: Tallahassee Fl Posts: 773	Re: AC Harness replacement??? Brown wire gets removed from old heater switch connector, reinstall into the AC harness connector?

02-02-2011, 08:54 PM	#3
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: AC Harness replacement??? I have done it 3 or 4 time in the last year.. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

02-02-2011, 11:16 PM	#7
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: AC Harness replacement??? yes. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

02-03-2011, 09:08 PM	#9
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,080	Re: AC Harness replacement??? Mel if he decides against it I would like a chance for it. Just let me know if it gets to me. Thanks, Harold __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

02-04-2011, 10:20 AM	#10
JMac11 Registered User Join Date: May 2005 Location: Tallahassee Fl Posts: 773	Re: AC Harness replacement??? PM Sent, will take it..... Thanks for all the help

05-09-2016, 02:12 AM	#11
cwilkie Chance Join Date: Sep 2001 Location: Belcourt ,ND, USA Posts: 750	Re: AC Harness replacement??? Hi Wes. Do you have the order they go in on the fan speed switch? Attached Images __________________ 1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400

05-09-2016, 02:13 AM	#12
cwilkie Chance Join Date: Sep 2001 Location: Belcourt ,ND, USA Posts: 750	Re: AC Harness replacement??? Here are the four wires I have. Attached Images __________________ 1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400



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