Radiator Heater Hose Connection? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RICHARD MORGAN · 02-23-2006, 07:03 PM

I plan on buying a new radiator this week from www.radiators.com. My question is why do some radiators have a heater hoses connection while others do not? Dont they all trucks have heaters?

krue · 02-23-2006, 08:05 PM

I don't think my hoses connect to the radiator. I know at least one connects to the water pump. I think the other connects to the intake.

Yeller68 · 02-23-2006, 08:16 PM

Mine plug into the manifold, and one into the water pump. Some models I do think went into the radiator. Mine is a '68 with a 307

Gordo · 02-23-2006, 09:47 PM

In most cases the return heater hose (3/4") goes to the radiator if the truck has a/c. A non a/c truck return heater hose goes to the water pump. The heater hose that is feeding the heater core (5/8") with hot coolant comes from the intake.

krue · 02-23-2006, 10:28 PM

My truck is an a/c truck (it's not hooked up but it's there) and it doesn't go to the radiator. That's not to say the DSOM didn't change out the radiator.

da-burb · 02-23-2006, 10:40 PM

Most replacement radiators no longer have the heater hose return connection. I think the main factor I have noticed is that automatic tranny trucks had the return connect. All of my trucks happen to be missing the cab cooling device but still have the heater return line in the radiator.

Without the above the return line then goes to the water pump.

krue · 02-23-2006, 10:44 PM

Once again, my truck has an automatic too. I've never owned a truck with the heater hose return. Could it be a regional thing.

Yeller68 · 02-23-2006, 10:59 PM

Mine is a non ac, automatic tranny.

Longhorn Man · 02-23-2006, 11:04 PM

My first truck was fairly original, and the rad apeared to be original, but in reality there's no telling. It had a small block/auto, A/C and no nipple on the rad.
My other two trucks were so far from stock with engines that weren't even the same type that was there originally... so there's no telling what was or was not there originally.

68 50th · 02-24-2006, 01:55 AM

I posted some heater hose routing pics from 1972 Chevrolet 10-30 Series Truck Service Manual in this thread:http://67-72chevytrucks.com/vboard/s...d.php?t=188679

MACO · 02-24-2006, 02:11 AM

My truck a 71 C20 with 350V8 auto no air has the hose going to the rad. The guy who lives next door has the same truck and same hose to rad. The rad in my truck appears original, his has been replaced at some time.

**Stocker** · 02-24-2006, 09:53 AM

'72 K20 350, auto, factory A/C, heater hose nipples on radiator.

blazerparts · 02-24-2006, 11:42 AM

Both mine, AC and autos, the heater hoses are attached at intake manifold and h20 pump. The 350 has an edlebrock mani, the 396 has the stock cast iron holley.

02-23-2006, 07:03 PM	#1
RICHARD MORGAN Registered User Join Date: Jan 2004 Location: HERNDON VA Posts: 216	Radiator Heater Hose Connection? I plan on buying a new radiator this week from www.radiators.com. My question is why do some radiators have a heater hoses connection while others do not? Dont they all trucks have heaters?

02-23-2006, 08:05 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Radiator Heater Hose Connection? I don't think my hoses connect to the radiator. I know at least one connects to the water pump. I think the other connects to the intake. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

02-23-2006, 08:16 PM	#3
Yeller68 Active Member Join Date: Aug 2001 Location: Villa Rica, Ga Posts: 297	Re: Radiator Heater Hose Connection? Mine plug into the manifold, and one into the water pump. Some models I do think went into the radiator. Mine is a '68 with a 307

02-23-2006, 09:47 PM	#4
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Re: Radiator Heater Hose Connection? In most cases the return heater hose (3/4") goes to the radiator if the truck has a/c. A non a/c truck return heater hose goes to the water pump. The heater hose that is feeding the heater core (5/8") with hot coolant comes from the intake. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

02-23-2006, 10:28 PM	#5
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Radiator Heater Hose Connection? My truck is an a/c truck (it's not hooked up but it's there) and it doesn't go to the radiator. That's not to say the DSOM didn't change out the radiator. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

02-23-2006, 10:40 PM	#6
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Re: Radiator Heater Hose Connection? Most replacement radiators no longer have the heater hose return connection. I think the main factor I have noticed is that automatic tranny trucks had the return connect. All of my trucks happen to be missing the cab cooling device but still have the heater return line in the radiator. Without the above the return line then goes to the water pump. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

02-23-2006, 10:44 PM	#7
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Radiator Heater Hose Connection? Once again, my truck has an automatic too. I've never owned a truck with the heater hose return. Could it be a regional thing. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

02-23-2006, 10:59 PM	#8
Yeller68 Active Member Join Date: Aug 2001 Location: Villa Rica, Ga Posts: 297	Re: Radiator Heater Hose Connection? Mine is a non ac, automatic tranny.

02-23-2006, 11:04 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Radiator Heater Hose Connection? My first truck was fairly original, and the rad apeared to be original, but in reality there's no telling. It had a small block/auto, A/C and no nipple on the rad. My other two trucks were so far from stock with engines that weren't even the same type that was there originally... so there's no telling what was or was not there originally.

02-24-2006, 01:55 AM	#10
68 50th Senior Member Join Date: Jul 2004 Location: Sweden Posts: 833	Re: Radiator Heater Hose Connection? I posted some heater hose routing pics from 1972 Chevrolet 10-30 Series Truck Service Manual in this thread:http://67-72chevytrucks.com/vboard/s...d.php?t=188679 __________________ 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

02-24-2006, 02:11 AM	#11
MACO Registered User Join Date: Sep 2005 Location: British Columbia CANADA Posts: 118	Re: Radiator Heater Hose Connection? My truck a 71 C20 with 350V8 auto no air has the hose going to the rad. The guy who lives next door has the same truck and same hose to rad. The rad in my truck appears original, his has been replaced at some time. __________________ 1969 C20 Customer Camper CST, 396, TH400, Factory A/C, Olive Green.

02-24-2006, 09:53 AM	#12
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,722	Re: Radiator Heater Hose Connection? '72 K20 350, auto, factory A/C, heater hose nipples on radiator. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

02-24-2006, 11:42 AM	#13
blazerparts No,I DON'T have Tourett's Join Date: Mar 2005 Location: Reno, NV Posts: 556	Re: Radiator Heater Hose Connection? Both mine, AC and autos, the heater hoses are attached at intake manifold and h20 pump. The 350 has an edlebrock mani, the 396 has the stock cast iron holley. __________________ '72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater

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