Radiator Help.....AGAIN! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MBurns326 · 12-15-2008, 05:43 PM

Ok I'm enlisting everyone's help again. So I've had a time trying to get a new radiator in my truck. I switched from the 2 to 4 core, bought new retainers and pads, go everything hooked up and realized that there was no place on the radiator for the heater hose. I contacted RockAuto (where I bought the radiator) and they contacted Spectra Premium (the company who made the radiator) and they said that the radiators are not built with an outlet for the heater hose and it has to be rerouted. The kicker is that the guy from Spectra Premium didn’t know how to reroute it. He said it makes the heat more efficient, but was no other help.

Anybody know how and where to reroute the heater hose?

Thanks in advance!

Sinister · 12-15-2008, 05:48 PM

Reroute from the water pump and intake manifold. It's raining here, maybe later I'll be able to get out and take a look at the exact routing.

Sinister · 12-15-2008, 05:56 PM

Went out and checked. Water pump to upper fitting at firewall, intake manifold to lower. I have factory air though so it might be a different deal with just heat.

Tx Firefighter · 12-15-2008, 05:57 PM

There will be a plug on the passenger side of your water pump, just above the radiator hose. It is 1/2" NPT. You will need a bib that screws in place of that plug appropriate to your heater hose size.

MBurns326 · 12-15-2008, 06:02 PM

It may be asking a lot.....but can anyone take a picture of what it looks like?

Tx Firefighter · 12-15-2008, 06:22 PM

He is a picture of my 350 in my step. I circled the plug in blue. Just unscrew the plug and screw a fitting into place.

MBurns326 · 12-15-2008, 06:34 PM

Thanks that helps a lot! One other thing....what advantage does that have over being connected to the radiator?

**truckdude239** · 12-15-2008, 06:54 PM

nothing better about it. heere is how mine is hooked up

Tx Firefighter · 12-15-2008, 07:23 PM

It gives faster heater warm up due to the heater core water returning to the engine rather than the radiator. The theory is that the heater water basically stays in the engine and heater core rather than involving the radiator until the engine warms enough to open the thermostat.

12-15-2008, 05:43 PM	#1
MBurns326 Registered User Join Date: Nov 2008 Location: Macon, GA Posts: 20	Radiator Help.....AGAIN! Ok I'm enlisting everyone's help again. So I've had a time trying to get a new radiator in my truck. I switched from the 2 to 4 core, bought new retainers and pads, go everything hooked up and realized that there was no place on the radiator for the heater hose. I contacted RockAuto (where I bought the radiator) and they contacted Spectra Premium (the company who made the radiator) and they said that the radiators are not built with an outlet for the heater hose and it has to be rerouted. The kicker is that the guy from Spectra Premium didn’t know how to reroute it. He said it makes the heat more efficient, but was no other help. Anybody know how and where to reroute the heater hose? Thanks in advance! __________________ Camouflage 1971 Chevrolet C/20 2WD

12-15-2008, 05:48 PM	#2
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: Radiator Help.....AGAIN! Reroute from the water pump and intake manifold. It's raining here, maybe later I'll be able to get out and take a look at the exact routing. __________________ Beat it to fit, Paint it to match...

12-15-2008, 05:56 PM	#3
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: Radiator Help.....AGAIN! Went out and checked. Water pump to upper fitting at firewall, intake manifold to lower. I have factory air though so it might be a different deal with just heat. __________________ Beat it to fit, Paint it to match...

12-15-2008, 05:57 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Radiator Help.....AGAIN! There will be a plug on the passenger side of your water pump, just above the radiator hose. It is 1/2" NPT. You will need a bib that screws in place of that plug appropriate to your heater hose size. __________________ I'm on the Instagram- @Gearhead_Kevin Last edited by Tx Firefighter; 12-15-2008 at 05:58 PM.

12-15-2008, 06:02 PM	#5
MBurns326 Registered User Join Date: Nov 2008 Location: Macon, GA Posts: 20	Re: Radiator Help.....AGAIN! It may be asking a lot.....but can anyone take a picture of what it looks like? __________________ Camouflage 1971 Chevrolet C/20 2WD

12-15-2008, 06:22 PM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Radiator Help.....AGAIN! He is a picture of my 350 in my step. I circled the plug in blue. Just unscrew the plug and screw a fitting into place. Attached Images __________________ I'm on the Instagram- @Gearhead_Kevin

12-15-2008, 06:34 PM	#7
MBurns326 Registered User Join Date: Nov 2008 Location: Macon, GA Posts: 20	Re: Radiator Help.....AGAIN! Thanks that helps a lot! One other thing....what advantage does that have over being connected to the radiator? __________________ Camouflage 1971 Chevrolet C/20 2WD Last edited by MBurns326; 12-15-2008 at 06:35 PM.

12-15-2008, 06:54 PM	#8
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,233	Re: Radiator Help.....AGAIN! nothing better about it. heere is how mine is hooked up Attached Images __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 12-15-2008 at 06:56 PM.

12-15-2008, 07:23 PM	#9
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Radiator Help.....AGAIN! It gives faster heater warm up due to the heater core water returning to the engine rather than the radiator. The theory is that the heater water basically stays in the engine and heater core rather than involving the radiator until the engine warms enough to open the thermostat. __________________ I'm on the Instagram- @Gearhead_Kevin

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