BB heater hose routing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72 longhorn BB · 11-15-2005, 10:35 PM

Hey there, anyone got pics of what is correct routing / strapping / clamping of the heater hoses on a BB?

Also, which one routes to the rad, and which one routes to the top of the manifold?

Much thanks, ahead of time

68 50th · 11-16-2005, 02:24 AM

Upper to rad, lower to manifold.
On mine the hose from heater core to manifold has two shut of valves, the valve that should be mounted to the inner fender (where you see four clamps) is taken out because it leaked.
The other valve is mounted near the manifold.
I don't know for sure if this is correct.
There is also a clamp holding both hoses to the inner fender.

72 longhorn BB · 11-16-2005, 06:56 AM

So the routing goes under the A/C comperssor. Man, there must be some special clamps or things used to keep it out of the way of the belts and pulleys and fan.

That is where I really have to focus on.

Can I ask if you have a detail pic of the areas where it routes to get attached to these two points?

Thanks alot.

dwaite72lnghrn · 11-16-2005, 07:03 AM

Here is a pic of a airconditioned BB. Top hose goes to the rad bung. Bottom hose goes to the heat control valve then to the intake bung next to the water pump return.

72 longhorn BB · 11-16-2005, 07:13 AM

Thanks for that picture, which confirms what I was worried about. It looks like the hose for the intake mfld routes really near the belts, and I am afraid that with out proper clamping/strapping etc, it will get chewed up. Since I am trying to get this back together like it was made, your picture will really help me.

All I need to figure out now is how to prevent it from getting chaffed by the belt or fan.

MUCH thanks to you .

dwaite72lnghrn · 11-16-2005, 07:15 AM

The airconditioner bracket has a metal loop bolted on the keep the hose out of harms way. Can't really get a good pic but in this 1 you can see the loop on the AC bracket.

MrC1 · 11-16-2005, 03:54 PM

I found the heater hose running to the radiator actually ground 1/2 way through by the a/c compressor clutch on mine. I replaced the hoses last weekend and got creative routing behind the positive batt cable to help keep it away.

68 50th · 11-16-2005, 05:39 PM

Here are some more pic's showing the hose going to the manifold under the AC compressor and through the metal loop.
No problems with that one being to close to anything.

68 50th · 11-16-2005, 05:42 PM

The hose going to the rad is really close to the AC compressor clutch.
I haven't noticed that before, I think it have to be clamped better, maybe there is some clamp missing on mine.

68 50th · 11-16-2005, 05:45 PM

Forgot the pic's in the last reply, here they are.

robs71k5 · 02-16-2013, 01:17 PM

Can anyone answer why the hoses are two different sizes ? Would I be smart to make them both the same size ?
Posted via Mobile Device

11-15-2005, 10:35 PM	#1
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	BB heater hose routing Hey there, anyone got pics of what is correct routing / strapping / clamping of the heater hoses on a BB? Also, which one routes to the rad, and which one routes to the top of the manifold? Much thanks, ahead of time __________________ 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"

11-16-2005, 02:24 AM	#2
68 50th Senior Member Join Date: Jul 2004 Location: Sweden Posts: 833	Re: BB heater hose routing Upper to rad, lower to manifold. On mine the hose from heater core to manifold has two shut of valves, the valve that should be mounted to the inner fender (where you see four clamps) is taken out because it leaked. The other valve is mounted near the manifold. I don't know for sure if this is correct. There is also a clamp holding both hoses to the inner fender. Attached Images __________________ Mats.. ---------------------------------------------------- 1971 Cheyenne Super Custom Camper 475CBB/TH400/AC 1992 Silverado Sport Truck 1988 Silverado 2500 Ext Longbed 4x4 2001 GMC Sierra SLT 4x4 1990 Chevrolet K3500 1965 Pontiac Grand Prix 1980 Z 28 350/4-speed/AC/T-top 1980 Camaro Coupe V6/3-speed 1979 Buick Century Wagon

11-16-2005, 06:56 AM	#3
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Re: BB heater hose routing So the routing goes under the A/C comperssor. Man, there must be some special clamps or things used to keep it out of the way of the belts and pulleys and fan. That is where I really have to focus on. Can I ask if you have a detail pic of the areas where it routes to get attached to these two points? Thanks alot. __________________ 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"

11-16-2005, 07:03 AM	#4
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: BB heater hose routing Here is a pic of a airconditioned BB. Top hose goes to the rad bung. Bottom hose goes to the heat control valve then to the intake bung next to the water pump return. Attached Images __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-16-2005, 07:13 AM	#5
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Re: BB heater hose routing Thanks for that picture, which confirms what I was worried about. It looks like the hose for the intake mfld routes really near the belts, and I am afraid that with out proper clamping/strapping etc, it will get chewed up. Since I am trying to get this back together like it was made, your picture will really help me. All I need to figure out now is how to prevent it from getting chaffed by the belt or fan. MUCH thanks to you . __________________ 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"

11-16-2005, 07:15 AM	#6
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: BB heater hose routing The airconditioner bracket has a metal loop bolted on the keep the hose out of harms way. Can't really get a good pic but in this 1 you can see the loop on the AC bracket. Attached Images __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-16-2005, 03:54 PM	#7
MrC1 Dork For Days Join Date: Aug 2005 Location: Dallas Posts: 407	Re: BB heater hose routing I found the heater hose running to the radiator actually ground 1/2 way through by the a/c compressor clutch on mine. I replaced the hoses last weekend and got creative routing behind the positive batt cable to help keep it away. __________________ 1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby!

11-16-2005, 05:39 PM	#8
68 50th Senior Member Join Date: Jul 2004 Location: Sweden Posts: 833	Re: BB heater hose routing Here are some more pic's showing the hose going to the manifold under the AC compressor and through the metal loop. No problems with that one being to close to anything. Attached Images __________________ Mats.. ---------------------------------------------------- 1971 Cheyenne Super Custom Camper 475CBB/TH400/AC 1992 Silverado Sport Truck 1988 Silverado 2500 Ext Longbed 4x4 2001 GMC Sierra SLT 4x4 1990 Chevrolet K3500 1965 Pontiac Grand Prix 1980 Z 28 350/4-speed/AC/T-top 1980 Camaro Coupe V6/3-speed 1979 Buick Century Wagon

11-16-2005, 05:42 PM	#9
68 50th Senior Member Join Date: Jul 2004 Location: Sweden Posts: 833	Re: BB heater hose routing The hose going to the rad is really close to the AC compressor clutch. I haven't noticed that before, I think it have to be clamped better, maybe there is some clamp missing on mine. __________________ Mats.. ---------------------------------------------------- 1971 Cheyenne Super Custom Camper 475CBB/TH400/AC 1992 Silverado Sport Truck 1988 Silverado 2500 Ext Longbed 4x4 2001 GMC Sierra SLT 4x4 1990 Chevrolet K3500 1965 Pontiac Grand Prix 1980 Z 28 350/4-speed/AC/T-top 1980 Camaro Coupe V6/3-speed 1979 Buick Century Wagon

11-16-2005, 05:45 PM	#10
68 50th Senior Member Join Date: Jul 2004 Location: Sweden Posts: 833	Re: BB heater hose routing Forgot the pic's in the last reply, here they are. Attached Images __________________ Mats.. ---------------------------------------------------- 1971 Cheyenne Super Custom Camper 475CBB/TH400/AC 1992 Silverado Sport Truck 1988 Silverado 2500 Ext Longbed 4x4 2001 GMC Sierra SLT 4x4 1990 Chevrolet K3500 1965 Pontiac Grand Prix 1980 Z 28 350/4-speed/AC/T-top 1980 Camaro Coupe V6/3-speed 1979 Buick Century Wagon

02-16-2013, 01:17 PM	#11
robs71k5 K5drive Join Date: Nov 2004 Location: burnaby BC Canada Posts: 814	Re: BB heater hose routing Can anyone answer why the hoses are two different sizes ? Would I be smart to make them both the same size ? Posted via Mobile Device



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