The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Can a heater core be installed updise down? Effects?

geezer#99 · 10-13-2018, 05:23 PM

You want the hoses to run from the intake to the bottom of the core, from the top of the core back to the pump.
You can leave your core alone and swap the hose barbs on the intake and water pump so they match the sizes on your core. The barb fittings should interchange but if they don’t you can get ones that do fit.

Here’s some examples of barb fittings in different sizes.
https://www.smpbuyersguide.com/4seas...-guide/757.php

10-13-2018, 05:23 PM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,524	Re: Can a heater core be installed updise down? Effects? You want the hoses to run from the intake to the bottom of the core, from the top of the core back to the pump. You can leave your core alone and swap the hose barbs on the intake and water pump so they match the sizes on your core. The barb fittings should interchange but if they don’t you can get ones that do fit. Here’s some examples of barb fittings in different sizes. https://www.smpbuyersguide.com/4seas...-guide/757.php