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#1 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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How does the AC wiring harness enter the engine compartment?
From the schematic it looks like it goes through the evaporator case and out a grommet in the case itself. Except I can't find one. Worse, I already have the heater core in so it might be a fun one to fish.
I'm speaking specfically of the green and black pair on a packard connector that plugs into the compressor, and that has a diode soldered between the two posts of the connector. Thanks for any 'leads'! -Dave
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#2 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: How does the AC wiring harness enter the engine compartment?
Why couldn't have asked that about 20 hours ago? I'm now about 150 miles from my truck.
The wires do not come out through the evaporator case. They come through the firewall through the same grommet as the A/C vacuum limes as I recall. The hole is in the firewall to the right (when viewed the front) of the evaporator case near the top of the bell housing recess in the firewall at about 11:00. Here's a picture, but I don't think it'll help much. I don't know if you can see it, but on my computer it looks like there is a green pixel at the point where the vacuum hoses and wires come through the firewall. The wires are encased in a fabric loom and are strapped to the heater hoses through the engine compartment. If you look at the picture I posted yesterday in your thread "The Impossible Air Conditioning Connection" you can see that routing. Edit: Added a zoomed in pic with showing the fabric loom routing to the compressor. Hope this helps. Jim Last edited by FirstOwner69; 05-03-2014 at 01:36 AM. |
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#3 |
Registered User
![]() Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: How does the AC wiring harness enter the engine compartment?
Here is a pic of an untouched factory route. I have seen some that have the wires going under the a/c housing, and others that run them over.
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Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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#4 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: How does the AC wiring harness enter the engine compartment?
I went through my deconstruct pictures, mine was the same as Turp Mcspray's.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#5 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: How does the AC wiring harness enter the engine compartment?
That's a better picture that clearly shows what I was trying to describe. To correct something I said in my previous post, I believe the wires were wrapped as Turp's picture shows all the way to the compressor rather than in fabric loom. I recall running them in loom for appearance sake since I had some extra. Mine ran under the evaporator case then along the heater hose as stated in my first post.
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#6 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: How does the AC wiring harness enter the engine compartment?
Thanks!. I was apparently looking at some weird diesel or V6 or who knows what configuration in the assembly manual.
From the assembly manual it looks like they're supposed to run under. I may be using the wrong one of those two holes, I'll have to run out and double check. I wish our assembly manuals SAID what option or feature that page describes (like my Impala and Camaro ones do). The index this board put together is super-helpful, but it'd still be handy.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#7 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: How does the AC wiring harness enter the engine compartment?
OK, I'm at a loss here. Below you can see the original photo I took during disassembly and then the current state of the truck. I guess the body shop must have covered the hole, but I really have no idea why. I'm going to have to open it up just for the cable control I think.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#8 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: How does the AC wiring harness enter the engine compartment?
Edited: Guess I didn't do a good job of reading your post.
That's what I'm thinking too. I believe you need the sealed hole for the cable. Maybe they plugged it because it was ragged and forgot to drill it prior to paint. You'll have a tough time finding that grommet though. If you find one let me know where. Jim Last edited by FirstOwner69; 05-03-2014 at 03:14 PM. |
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#9 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: How does the AC wiring harness enter the engine compartment?
They probably filled it because the grommet was missing and it was just packed with bathtub caulking, it looks like!
What's special about the grommet? I did get one with three holes and little metal retaining clips, but that's the only fancy one I've run across.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#10 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Factory 1971 shop manual shows it like this.
![]() ![]() ![]() Here is the inside the cab wiring. ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#11 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: How does the AC wiring harness enter the engine compartment?
The grommet I could not find is the single hole grommet that the cable passes through. The one that goes in your plugged hole. The 3 hole grommet is for the other hole which the vacuum lines and harness go through. Both grommets are clearly visible in turp mcspray's picture in post #3.
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