heater hose ?s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tnblazerk5** · 09-16-2005, 09:07 PM

where does the heater hose from the rad go to (just put 4 core in and old rad didnt have this on it )? heater core top or bottom ?
if so do i block off the water pump or the intake ?

corn · 09-16-2005, 09:27 PM

You can run either the radiator or the waterpump for the 3/4 hose. The 5/8 will still go to the intake. The heater core should tell which way to go, the smaller of the two will go to the intake. Actually you cant really hook up the hoses wrong on the core...

**Stocker** · 09-16-2005, 09:28 PM

Radiator to top heater (3/4" = larger hose).

Lower heater (5/8" = smaller) to control valve on inner fender, then to intake -

Water pump blocked -

This is on my stock '72 with A/C. Hope this helps!

Mike

cdowns · 09-16-2005, 09:45 PM

if you had stayed in florida you wouldn't need a damn heater !!!!!

da-burb · 09-16-2005, 11:23 PM

"Actually you cant really hook up the hoses wrong on the core..."

But someone could have put the heater core in up-side-down. Correct is 3/4" @ top, 5/8" @ bottom on a non-A/C truck.

corn · 09-17-2005, 12:07 AM

Can coolant really go the wrong way through a core?

**Stocker** · 09-17-2005, 01:06 AM

Quote:

Originally Posted by da-burb

Correct is 3/4" @ top, 5/8" @ bottom on a non-A/C truck.

And, as noted in my post above, also in an A/C truck.

**tnblazerk5** · 09-17-2005, 05:32 AM

Quote:

Originally Posted by cdowns

if you had stayed in florida you wouldn't need a damn heater !!!!!

i used to live down there

missed the mountains had to move back here

**tnblazerk5** · 09-17-2005, 05:33 AM

oh yea thanks for the input everybody

67chevemall · 09-17-2005, 09:10 AM

Quote:

Originally Posted by cornfed63

Can coolant really go the wrong way through a core?

probaly just a gravity thing travels down alot easier..$0.02

**tnblazerk5** · 09-17-2005, 03:26 PM

well as things would have it the heatercore is in upside down lol i have no clue to what i was thinkin back then the last time i changed it was about 15 to 18 years ago hhhmmmm i may need to look at the heater core and see if its still ok

Fatback · 09-17-2005, 05:38 PM

I recently had almost the same questions. Turns out I had them backwards, not that it made a big difference, I wanted it to look right.

09-16-2005, 09:07 PM	#1
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	heater hose ?s where does the heater hose from the rad go to (just put 4 core in and old rad didnt have this on it )? heater core top or bottom ? if so do i block off the water pump or the intake ?

09-16-2005, 09:28 PM	#3
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,722	Radiator to top heater (3/4" = larger hose). Lower heater (5/8" = smaller) to control valve on inner fender, then to intake - Water pump blocked - This is on my stock '72 with A/C. Hope this helps! Mike __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay Last edited by Stocker; 09-16-2005 at 09:32 PM.

09-16-2005, 09:45 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	if you had stayed in florida you wouldn't need a damn heater !!!!! __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-16-2005, 11:23 PM	#5
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	"Actually you cant really hook up the hoses wrong on the core..." But someone could have put the heater core in up-side-down. Correct is 3/4" @ top, 5/8" @ bottom on a non-A/C truck. __________________ 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

09-17-2005, 03:26 PM	#11
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	well as things would have it the heatercore is in upside down lol i have no clue to what i was thinkin back then the last time i changed it was about 15 to 18 years ago hhhmmmm i may need to look at the heater core and see if its still ok Last edited by tnblazerk5; 09-17-2005 at 03:26 PM.

09-16-2005, 09:27 PM	#2
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	You can run either the radiator or the waterpump for the 3/4 hose. The 5/8 will still go to the intake. The heater core should tell which way to go, the smaller of the two will go to the intake. Actually you cant really hook up the hoses wrong on the core...

09-17-2005, 12:07 AM	#6
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Can coolant really go the wrong way through a core?

09-17-2005, 05:33 AM	#9
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	oh yea thanks for the input everybody

09-17-2005, 05:38 PM	#12
Fatback Registered User Join Date: Dec 2003 Location: North Central FL Posts: 126	I recently had almost the same questions. Turns out I had them backwards, not that it made a big difference, I wanted it to look right. __________________ 70 C/10 LWB 69 Cougar 68 Mustang 68 GMC 4X4 SWB



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