The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - '72 C-10 Heater Core

garyd1961 · 12-02-2020, 04:07 PM

Airbox might be full of trash. Also you can try flushing out the heater core. Just unhook your heater hoses from the heater core and use a garden hose to flush out the core. Flush it both ways a couple of times. I did this on my 68 Pontiac and it went to blowing hot.
I did put a new heater core in my 70 C10 though. It's a little work, I took the hood off and dropped the inner fender down. I found plumbers putty makes a good seal for the airbox. Seals great and looks factory.
I got my heater core off Ebay. Found a brass and copper one and it fit just fine.

12-02-2020, 04:07 PM	#5
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: '72 C-10 Heater Core Airbox might be full of trash. Also you can try flushing out the heater core. Just unhook your heater hoses from the heater core and use a garden hose to flush out the core. Flush it both ways a couple of times. I did this on my 68 Pontiac and it went to blowing hot. I did put a new heater core in my 70 C10 though. It's a little work, I took the hood off and dropped the inner fender down. I found plumbers putty makes a good seal for the airbox. Seals great and looks factory. I got my heater core off Ebay. Found a brass and copper one and it fit just fine.