Heater core flow? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

fun in dirt · 07-26-2008, 11:45 AM

Well I live in Mississippi and it's smokin hot here these days. But I still love cruisin in my K5... no top, no a/c & all. However, even with the heater off it still blows some hot air out the vents. I had a Chevelle that did the same thing & my Daddy installed a inline shutoff valve in the hose going to the heater core. So I thought I would do the same thing on this "Bucket of Bolts". But I can't remember if he put it in the top or bottom hose of the core. Which direction does the water flow through the core - in the top then out the bottom OR in the bottom & out the top?

jeffspower · 07-26-2008, 12:34 PM

Depends if your core is installed right side up or upside down...

The sure way is to install it in the smaller (5/8") hose- it is the supply.

Longhorn Man · 07-26-2008, 10:24 PM

it wouldn't matter which one you capped off, if the coolant can't get through, then it can't get through. Same mind set as the hot water in the shower, the water is cold at first, till you flush all the cold water out of the pipes.

07-26-2008, 11:45 AM	#1
fun in dirt Registered User Join Date: Jan 2007 Location: Mississippi Posts: 2,119	Heater core flow? Well I live in Mississippi and it's smokin hot here these days. But I still love cruisin in my K5... no top, no a/c & all. However, even with the heater off it still blows some hot air out the vents. I had a Chevelle that did the same thing & my Daddy installed a inline shutoff valve in the hose going to the heater core. So I thought I would do the same thing on this "Bucket of Bolts". But I can't remember if he put it in the top or bottom hose of the core. Which direction does the water flow through the core - in the top then out the bottom OR in the bottom & out the top? __________________ '72 C to K20 "Cannibalizer" http://67-72chevytrucks.com/vboard/s...32#post8653432 '85 K30 "Big Nassy" '06 3500 Duramax ...tow truck '06 Silverado SS...DD '06 C1500 WT...DD '07 Classic C1500 WT...DD Built & sold cause can't keep 'em all: '72 Blazer "The Bucket" http://67-72chevytrucks.com/vboard/s...d.php?t=433190 '55 Chevy straight axle gasser https://www.trifive.com/forums/showthread.php?t=173938 '69 Pro Street Chevelle http://www.chevelles.com/forums/showthread.php?t=332541 '86 M1031 CUCV http://67-72chevytrucks.com/vboard/s...d.php?t=553619

07-26-2008, 12:34 PM	#2
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: Heater core flow? Depends if your core is installed right side up or upside down... The sure way is to install it in the smaller (5/8") hose- it is the supply. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

07-26-2008, 10:24 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Heater core flow? it wouldn't matter which one you capped off, if the coolant can't get through, then it can't get through. Same mind set as the hot water in the shower, the water is cold at first, till you flush all the cold water out of the pipes. Last edited by Longhorn Man; 07-26-2008 at 10:25 PM.



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