what heater core hose where? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matt_field · 04-13-2003, 06:09 PM

this is on my 67, i want to make sure i have it right before i pour coolent in it. does my upper go to intake or does it go to the water pump? i think the upper was the smaller one, if i remember right. thanks

matt

Nova_Cobra64 · 04-13-2003, 06:25 PM

I just took a look at mine. The top goes to the manifold, bottom to the water pump.

matt_field · 04-13-2003, 09:07 PM

thanks a lot, i really appreciate it

matt

Gordo · 04-13-2003, 09:27 PM

According to the 67-72 shop manuals, the hose coming from the intake (8 cyl) runs into the lower heater core fitting, the upper heater core fitting runs into the water pump (non a/c) or to the radiator (with a/c).

Blue Beard · 04-13-2003, 09:39 PM

I have a 70 & 72 sitting out front.

No matter which one I looked at the bigger of the two hoses goes to the water pump.

matt_field · 04-13-2003, 10:06 PM

does it even matter what way it is hooked up? either have heat or not or somthing? thanks

matt

da-burb · 04-13-2003, 11:35 PM

Does it matter if it is backwards? My guess is yes. The heater core might never be 100% full if you try to run it backwards/upside down. If the 3/4" hose is at the bottom it will be able to empty the core faster than the 5/8" hose can fill it. That might also mean listening to the sound of running water as it gurgles on through the heater core. On the cold days of MN I would think it wouldn't put out the heat like it should either.

04-13-2003, 06:09 PM	#1
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	what heater core hose where? this is on my 67, i want to make sure i have it right before i pour coolent in it. does my upper go to intake or does it go to the water pump? i think the upper was the smaller one, if i remember right. thanks matt __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

04-13-2003, 06:25 PM	#2
Nova_Cobra64 Registered User Join Date: Aug 2002 Location: Melville, SK Posts: 1,145	I just took a look at mine. The top goes to the manifold, bottom to the water pump. __________________ 2004 Silverado - Beater 1969 GMC - In progress http://67-72chevytrucks.com/vboard/s...d.php?t=441683 2011 Aveo - Work commuter 2013 Crestliner Fish Hawk 1650 - The reason no work gets done on the project truck.

04-13-2003, 09:07 PM	#3
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	thanks a lot, i really appreciate it matt __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

04-13-2003, 09:27 PM	#4
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	According to the 67-72 shop manuals, the hose coming from the intake (8 cyl) runs into the lower heater core fitting, the upper heater core fitting runs into the water pump (non a/c) or to the radiator (with a/c). __________________ 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.

04-13-2003, 09:39 PM	#5
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	I have a 70 & 72 sitting out front. No matter which one I looked at the bigger of the two hoses goes to the water pump. __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

04-13-2003, 10:06 PM	#6
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	does it even matter what way it is hooked up? either have heat or not or somthing? thanks matt __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

04-13-2003, 11:35 PM	#7
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Does it matter if it is backwards? My guess is yes. The heater core might never be 100% full if you try to run it backwards/upside down. If the 3/4" hose is at the bottom it will be able to empty the core faster than the 5/8" hose can fill it. That might also mean listening to the sound of running water as it gurgles on through the heater core. On the cold days of MN I would think it wouldn't put out the heat like it should either. __________________ 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



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