Firewall heater hole for aftermarket A/C? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

FoxJ12 · 03-07-2021, 01:53 AM

70 C10 1/2ton
It originally just had a simple heater with no A/C. I am likely going to be installing an aftermarket AC heat combo kit (vintage or old air) and I am wondering how these kits incorporate the stock holes on the passenger side of the firewall. I am asking now so I don’t have to back track down the road when this truck is in primer or paint.
Any input is appreciated. Thanks.

**CMars45000** · 03-11-2021, 01:48 PM

They come with block-off plates for the blower fan hole and a large plate for the other 2 holes. The new systems like the Vintage Air put everything inside under the dash. The only thing that passes thru the firewall are the 2 heater hoses and and the 2 A/C hoses

FoxJ12 · 03-12-2021, 01:32 AM

Thank you, Mars.

One more question now: Considering a vintage with everything under the dash, does anyone have under dash photos of the installation? Just thinking ahead of where to mount the ECM for the LM7 I’m using.

03-07-2021, 01:53 AM	#1
FoxJ12 Registered User Join Date: Aug 2018 Location: Breton, Alberta Posts: 24	Firewall heater hole for aftermarket A/C? 70 C10 1/2ton It originally just had a simple heater with no A/C. I am likely going to be installing an aftermarket AC heat combo kit (vintage or old air) and I am wondering how these kits incorporate the stock holes on the passenger side of the firewall. I am asking now so I don’t have to back track down the road when this truck is in primer or paint. Any input is appreciated. Thanks.

03-11-2021, 01:48 PM	#2
CMars45000 Registered User Join Date: Jul 2006 Location: Pittsburgh, PA Posts: 204	Re: Firewall heater hole for aftermarket A/C? They come with block-off plates for the blower fan hole and a large plate for the other 2 holes. The new systems like the Vintage Air put everything inside under the dash. The only thing that passes thru the firewall are the 2 heater hoses and and the 2 A/C hoses __________________ Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle

03-12-2021, 01:32 AM	#3
FoxJ12 Registered User Join Date: Aug 2018 Location: Breton, Alberta Posts: 24	Re: Firewall heater hole for aftermarket A/C? Thank you, Mars. One more question now: Considering a vintage with everything under the dash, does anyone have under dash photos of the installation? Just thinking ahead of where to mount the ECM for the LM7 I’m using.



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