How hard is it to change out the heater core? - Impala Tech
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post #1 of 7 (permalink) Old 01-17-2006, 08:39 PM Thread Starter
Join Date: Jan 2006
Location: Las Vegas
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How hard is it to change out the heater core?

67 Impala went to 230 degrees before turning it off today. After cooling radiator was half empty. The night before I noticed that the windows were fogging with the heater on and, Doh!, I never thought that it might be rad fluid!

Anyway, I'm thinking its a cracked core. I haven't went looking under the hood to see how the core is accessed. Is this an under the dash job or under the hood job? And is there any step by step instructions I can download?
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post #2 of 7 (permalink) Old 01-17-2006, 09:55 PM
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Cool Heater Core

Need to consult with a Chilton's manual. Though your best bet is to buy all the GM manuals on a single CD (has Electrical, Assembly manual (tells how they installed heater cores on assembly line) as well as the service manual; that tells the technician how to change out a heater core).

From memory '77 up are under hood, but '76 down is under dash. It isn't hard to work under the dash if you’re a boneless octopus with the ability to see in the dark and have incredible dexterity.

Good Luck
Big Dave
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post #3 of 7 (permalink) Old 03-28-2007, 01:07 AM
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hey bud. i believe the heater box and all have to come out. I haven not changed mine but i have my whole box out as im redoing my 68. i looked at the possiblities and the core is in behind the firewall. Pull the unit from under the dash. BTW i have a only a heater car non ac. hope i helped you
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post #4 of 7 (permalink) Old 03-24-2008, 12:14 AM
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which heater hose goes where?

Where does the line from the intake go top or bottom on the heater core?
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post #5 of 7 (permalink) Old 10-20-2008, 09:53 PM
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Heater Core

Any luck changing your heater core? I too have a 1967 that sprung a leak and was hoping you can offer some insight how you did yours. It looks like the box is accessible from under the hood, but I didnt look too hard yet. I dont have AC.

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post #6 of 7 (permalink) Old 10-20-2008, 11:44 PM
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Intake goes to the top
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post #7 of 7 (permalink) Old 10-22-2008, 10:31 AM
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You just have to pull the heater box off of the firewall. If you don't have AC it's pretty easy. Once you remove the nuts from the studs you'll have to pry the box off since the sealer will be bonded to the cover. Go easy so you don't bend it up. Heater core will be right there.
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