Need help with A/C firewall... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**John Fabris** · 12-01-2005, 07:57 PM

Hi Guys and Gals,

I need a big favor from anyone that has a factory Air truck. There are two holes that I need pictures and a description of what is running thru those holes. I have circled both holes in this picture (actually, this picture is of a non air truck, so the hole on the curved part is not there), can someone get me a good picture of both holes with what is coming thru them?

THANKS!!!!!

chevymaz · 12-01-2005, 08:54 PM

I went a took a look at mine and the only thing coming out the two holes is vacuum lines.

**John Fabris** · 12-01-2005, 09:13 PM

Looking at your picture, it looks like there are two vacumn lines, and one bundle of wires coming out of the three hole grommet. Thanks, that gives me a better idea of what is going on.

The upper hole should have the long cable from the A/C controls coming out of it...

chevymaz · 12-01-2005, 09:23 PM

The wires coming out of the lower hole look to be a ground wire and a wire to the fan. The upper hole like you said is the cable that comes from the a/c controls.

qksilver · 12-01-2005, 10:36 PM

I can get you a picture of a stripped A/C firewall. The 2 trucks I have with A/C are buried in the back of the shop. I just brought home a stripped cab and frame , so i could take some very clear pix of that firewall.
PM me your email and I will send.
Steve

**John Fabris** · 12-01-2005, 11:37 PM

qsilver, I was trying to find out what was suppose to come out of those two holes and how they were run. I have a good idea now!!

**John Fabris** · 12-02-2005, 12:42 AM

Another Question, in the picture posted by Chevymaz, it appears that the wiring harness for the compressor comes out of the hole that is on the slope of the tranny hump part of the filewall, where on the firewall does the wire for the blower motor come out of?

chevymaz · 12-02-2005, 06:35 AM

the wire bundle you see coming out of the lower hole by the vacuum lines is the blower motor wire. The wire bundle rolled up in the pic that go th the compressor come thru on the drivers side of the firewall. I can get get you a pic of where they come thru this afternoon if you need it.

72 longhorn BB · 12-02-2005, 07:18 AM

I cobbed this off a thread just the other day.

It shows the reverse angle, from the inside, but I think it is what you are looking for.

12-01-2005, 07:57 PM	#1
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Need help with A/C firewall... Hi Guys and Gals, I need a big favor from anyone that has a factory Air truck. There are two holes that I need pictures and a description of what is running thru those holes. I have circled both holes in this picture (actually, this picture is of a non air truck, so the hole on the curved part is not there), can someone get me a good picture of both holes with what is coming thru them? THANKS!!!!! Attached Images __________________ John Fabris 67 C10 SWB

12-01-2005, 08:54 PM	#2
chevymaz What are you looking at? Join Date: Jul 2003 Location: Kellyville,Oklahoma Posts: 308	Re: Need help with A/C firewall... I went a took a look at mine and the only thing coming out the two holes is vacuum lines. __________________ 1971 GMC LWB 2005 Honda Element 2007 Honda Fit Last edited by chevymaz; 12-01-2005 at 09:10 PM.

12-01-2005, 09:13 PM	#3
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Need help with A/C firewall... Looking at your picture, it looks like there are two vacumn lines, and one bundle of wires coming out of the three hole grommet. Thanks, that gives me a better idea of what is going on. The upper hole should have the long cable from the A/C controls coming out of it... __________________ John Fabris 67 C10 SWB

12-01-2005, 09:23 PM	#4
chevymaz What are you looking at? Join Date: Jul 2003 Location: Kellyville,Oklahoma Posts: 308	Re: Need help with A/C firewall... The wires coming out of the lower hole look to be a ground wire and a wire to the fan. The upper hole like you said is the cable that comes from the a/c controls. __________________ 1971 GMC LWB 2005 Honda Element 2007 Honda Fit

12-01-2005, 10:36 PM	#5
qksilver Senior Member Join Date: Dec 2004 Location: Southern Pines NC Posts: 3,853	Re: Need help with A/C firewall... I can get you a picture of a stripped A/C firewall. The 2 trucks I have with A/C are buried in the back of the shop. I just brought home a stripped cab and frame , so i could take some very clear pix of that firewall. PM me your email and I will send. Steve

12-01-2005, 11:37 PM	#6
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Need help with A/C firewall... qsilver, I was trying to find out what was suppose to come out of those two holes and how they were run. I have a good idea now!! __________________ John Fabris 67 C10 SWB

12-02-2005, 12:42 AM	#7
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Need help with A/C firewall... Another Question, in the picture posted by Chevymaz, it appears that the wiring harness for the compressor comes out of the hole that is on the slope of the tranny hump part of the filewall, where on the firewall does the wire for the blower motor come out of? __________________ John Fabris 67 C10 SWB

12-02-2005, 06:35 AM	#8
chevymaz What are you looking at? Join Date: Jul 2003 Location: Kellyville,Oklahoma Posts: 308	Re: Need help with A/C firewall... the wire bundle you see coming out of the lower hole by the vacuum lines is the blower motor wire. The wire bundle rolled up in the pic that go th the compressor come thru on the drivers side of the firewall. I can get get you a pic of where they come thru this afternoon if you need it. __________________ 1971 GMC LWB 2005 Honda Element 2007 Honda Fit

12-02-2005, 07:18 AM	#9
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Re: Need help with A/C firewall... I cobbed this off a thread just the other day. It shows the reverse angle, from the inside, but I think it is what you are looking for. __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are"



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