Heater Core Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

okietruck · 11-07-2002, 04:22 PM

I'm preparing to replace the core in my 72 and have some questions. There are 2 sizes of hoses, 5/8" and 3/4". Is the 3/4" the top? And does the top hose connect to the waterpump or the intake? I had a friend helping me the last time this was done and he was the one taking care of it. I may be over cautious, but will it make any difference how it is hooked up?

*Piston* · 11-07-2002, 05:47 PM

In order of flow:
5/8's hose coming from the intake manifold(supply) goes to the lower connection on the heater core. The upper connection on the heater core is a 3/4 hose going to the waterpump (return).

okietruck · 11-08-2002, 08:19 AM

Thanks Piston. I was pretty sure that was how it was supposed to be, but I wanted some outside confirmation.

11-07-2002, 04:22 PM	#1
okietruck Registered User Join Date: Apr 2002 Location: Tulsa, OK, USA Posts: 117	Heater Core Questions I'm preparing to replace the core in my 72 and have some questions. There are 2 sizes of hoses, 5/8" and 3/4". Is the 3/4" the top? And does the top hose connect to the waterpump or the intake? I had a friend helping me the last time this was done and he was the one taking care of it. I may be over cautious, but will it make any difference how it is hooked up?

11-07-2002, 05:47 PM	#2
Piston Account Suspended Join Date: Oct 2002 Location: Olathe, KS Posts: 2,301	In order of flow: 5/8's hose coming from the intake manifold(supply) goes to the lower connection on the heater core. The upper connection on the heater core is a 3/4 hose going to the waterpump (return).

11-08-2002, 08:19 AM	#3
okietruck Registered User Join Date: Apr 2002 Location: Tulsa, OK, USA Posts: 117	Thanks Piston. I was pretty sure that was how it was supposed to be, but I wanted some outside confirmation.



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