'72 Heater Core Cut-Out Shape?

[Patricia Brown]

Hello,

Is the heater core cut-out on the firewall supposed to be just a big rectangle, or should it be a rectangle with 2 round notches on the inboard side for the heater hoses to pass through? I've seen '75 and '76 models with a rectangle plus heater-hose notches, but my '72 is devoid of the notches. Is this correct, or has someone taken a saw to it?

Thanks!
Patricia

[Joe L.]

Re: '72 Heater Core Cut-Out Shape?

Patricia-----

At least for non C-60 cars, I believe that there should be the "notches" for the heater core tubes. C-60 applications may be different; I'm not sure.

[Patricia Brown]

Re: '72 Heater Core Cut-Out Shape?

Forgive me, but what is C-60? Air conditioning? This car IS air conditioned.

Patricia

[Joe L.]

Re: '72 Heater Core Cut-Out Shape?

Patricia-----

Yes, C-60 is the designation for air conditioning in the Chevrolet RPO (regular production option) system. I don't know if the heater core firewall cut-out configuration was the same for C-60 cars as those without C-60. Perhaps, someone with a C-60-equipped early C3 can provide more information.

[Brandon Metzger]

Re: '72 Heater Core Cut-Out Shape?

Patricia,
I have a '72 with AC. I also have the Blower motor removed on from the firewall. If you are still interested I could take a picture of it and send it to you. My email address is tonersolutions@comcast.net

Regards,
Brandon

[Jack H.]

Re: '72 Heater Core Cut-Out Shape?

Heater core was different for A/C vs. non-A/C cars and the firewall cutout changed to accommodate it. That's one of the ways you can tell if a car was originally factory A/C equipped... The C60 section of the AIM should show the dimensional differences for the firewall cut to accommodate the heater core.

[Patricia Brown]

Re: '72 Heater Core Cut-Out Shape?

Thanks Jack and everyone. It sounds hopeful that it should not have notches. I'll keep my ears open.

Patricia