AC and Heater Hose Routing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**PbFut** · 03-04-2023, 09:10 PM

Upon install of the new ac lines, I am a bit disappointed with the inter action contact with the heater hoses. Can I ask someone for a picture or two of the routing of these lines? 72 c20 version with a SBC. Thank you in advance.

**71CHEVYSHORTBED402** · 03-04-2023, 10:54 PM

Quote:

Originally Posted by PbFut

Upon install of the new ac lines, I am a bit disappointed with the inter action contact with the heater hoses. Can I ask someone for a picture or two of the routing of these lines? 72 c20 version with a SBC. Thank you in advance.

Factory lines?

**allchevy58** · 03-04-2023, 10:59 PM

This is my 72' K2500, should be the same. Hopefully this helps you.

**FirstOwner69** · 03-04-2023, 11:14 PM

My '69. As original. Even has the original clamps, straps, etc. I have a few different shots, but this is the most inclusive.

**71CHEVYSHORTBED402** · 03-04-2023, 11:23 PM

Jim that engine bay is beautiful. Couple more

**PbFut** · 03-04-2023, 11:50 PM

Thank you every one. Jim, I was specificly thinking of your truck when I posted. Looks like the 69 had a different set up for the heater line and valve location. My 72 heater hose valve is mounted on the wheel well liner. Can someone confirm the 72 valve is mounted on the wheel well? Does the hose lay on top of the ac compressor and under the ac muffler pipe or up over the compressor mount area and along the muffler pipe after the bend and over to the valve?

**FirstOwner69** · 03-04-2023, 11:54 PM

Valve attached to inner fender is correct for '70-'72.

**PbFut** · 03-05-2023, 12:03 AM

Here is a shot of my current route. Seems the heater and ac hoses are way too much in contact

**FirstOwner69** · 03-05-2023, 12:19 AM

I'm 2000 miles from the truck, so I need to rely on my picture file. Here is a pre teardown shot that may help. Ignore the 2 red wires in the foreground.

**PbFut** · 03-05-2023, 02:17 AM

69 was way different than later years. 69 used the port off the water pump. Later years used the port off the intake manifold by the tstat. I guess the question is...does the hose from the manifold port route over the compressor front mount by the pully, or under the ac muffler pipe allowing that hot hose to contact the ac compressor housing.? I would think heat transfer to be a issue but in thinking about it, the air flow off the radiator is likely just as much a heat issue as a hot hose.. Again I am way over thinking this. I will rebuild this 500 times laying in bed tonight.

03-04-2023, 09:10 PM	#1
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 713	AC and Heater Hose Routing Upon install of the new ac lines, I am a bit disappointed with the inter action contact with the heater hoses. Can I ask someone for a picture or two of the routing of these lines? 72 c20 version with a SBC. Thank you in advance.

03-04-2023, 10:59 PM	#3
allchevy58 Senior Member Join Date: Aug 2011 Location: Reno, Nv. Posts: 1,441	Re: AC and Heater Hose Routing This is my 72' K2500, should be the same. Hopefully this helps you. Attached Images __________________ 1927 Willy's Knight 24,000 original miles, 1958 Impala 283/Powerglide, 1971 Monte Carlo 350/350, 1972 GMC K2500 350/350, 1976 Chev. K10 350/350, 2006 GMC Sierra 2500HD LBZ Duramax/Allison, 2006 Chev. Silverado K3500 LBZ Duramax/Allison

03-04-2023, 11:14 PM	#4
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,854	Re: AC and Heater Hose Routing My '69. As original. Even has the original clamps, straps, etc. I have a few different shots, but this is the most inclusive. Attached Images __________________ Jim

03-04-2023, 11:23 PM	#5
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,385	Re: AC and Heater Hose Routing Jim that engine bay is beautiful. Couple more Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

03-04-2023, 11:50 PM	#6
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 713	Re: AC and Heater Hose Routing Thank you every one. Jim, I was specificly thinking of your truck when I posted. Looks like the 69 had a different set up for the heater line and valve location. My 72 heater hose valve is mounted on the wheel well liner. Can someone confirm the 72 valve is mounted on the wheel well? Does the hose lay on top of the ac compressor and under the ac muffler pipe or up over the compressor mount area and along the muffler pipe after the bend and over to the valve?

03-04-2023, 11:54 PM	#7
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,854	Re: AC and Heater Hose Routing Valve attached to inner fender is correct for '70-'72. __________________ Jim

03-05-2023, 12:03 AM	#8
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 713	Re: AC and Heater Hose Routing Here is a shot of my current route. Seems the heater and ac hoses are way too much in contact Attached Images

03-05-2023, 12:19 AM	#9
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,854	Re: AC and Heater Hose Routing I'm 2000 miles from the truck, so I need to rely on my picture file. Here is a pre teardown shot that may help. Ignore the 2 red wires in the foreground. Attached Images __________________ Jim Last edited by FirstOwner69; 03-05-2023 at 12:28 AM.

03-05-2023, 02:17 AM	#10
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 713	Re: AC and Heater Hose Routing 69 was way different than later years. 69 used the port off the water pump. Later years used the port off the intake manifold by the tstat. I guess the question is...does the hose from the manifold port route over the compressor front mount by the pully, or under the ac muffler pipe allowing that hot hose to contact the ac compressor housing.? I would think heat transfer to be a issue but in thinking about it, the air flow off the radiator is likely just as much a heat issue as a hot hose.. Again I am way over thinking this. I will rebuild this 500 times laying in bed tonight.

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