Ac firewall holes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brave71 · 12-01-2013, 07:42 PM

This really sounds crazy to me but.. My 72 has original holes for factory ac in the firewall but no vent holes for ac in dash? It does not look like the firewall has been changed .. Seems like it would be alot of work to change ? Any one ever see something like this?

JimKshortstep4x4 · 12-01-2013, 07:56 PM

Since there is not a lot of difference in the firewall holes is it possible that you are looking at the standard heater holes? Here is a picture of a firewall with the hole patterns of both systems labeled.

Another possibility is that someone changed out the dash.

Brave71 · 12-01-2013, 08:14 PM

Thanks for the pics.it's got the ac holes just like in the picture.. Doesn't look like dash was changed and if it was it would have been nice if they would have put in an ac dash! There is about an inch and 1/8 space for the wire loom . Should it be that wide?

JimKshortstep4x4 · 12-02-2013, 12:42 PM

I am not sure what you mean by the space for the wireloom. Can you clarify?

If the dash is changed correctly you may not be able to tell since the spot welds are under the windshield seal and the sides are bolted in.

Jim

gysgtc · 12-02-2013, 06:29 PM

Are you talking about the cowl to hood seal area? 1 1/8"

gysgtc · 12-02-2013, 06:31 PM

Sorry. Where the wire loom is it is about 1 and 1/8 inch. Just measured mine.

12-01-2013, 07:42 PM	#1
Brave71 Registered User Join Date: Sep 2013 Location: Henderson, NV Posts: 304	Ac firewall holes This really sounds crazy to me but.. My 72 has original holes for factory ac in the firewall but no vent holes for ac in dash? It does not look like the firewall has been changed .. Seems like it would be alot of work to change ? Any one ever see something like this?

12-01-2013, 07:56 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Ac firewall holes Since there is not a lot of difference in the firewall holes is it possible that you are looking at the standard heater holes? Here is a picture of a firewall with the hole patterns of both systems labeled. Another possibility is that someone changed out the dash. Attached Images __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

12-01-2013, 08:14 PM	#3
Brave71 Registered User Join Date: Sep 2013 Location: Henderson, NV Posts: 304	Re: Ac firewall holes Thanks for the pics.it's got the ac holes just like in the picture.. Doesn't look like dash was changed and if it was it would have been nice if they would have put in an ac dash! There is about an inch and 1/8 space for the wire loom . Should it be that wide?

12-02-2013, 12:42 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Ac firewall holes I am not sure what you mean by the space for the wireloom. Can you clarify? If the dash is changed correctly you may not be able to tell since the spot welds are under the windshield seal and the sides are bolted in. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

12-02-2013, 06:29 PM	#5
gysgtc Registered User Join Date: Apr 2010 Location: Sutton, WV Posts: 340	Re: Ac firewall holes Are you talking about the cowl to hood seal area? 1 1/8"

12-02-2013, 06:31 PM	#6
gysgtc Registered User Join Date: Apr 2010 Location: Sutton, WV Posts: 340	Re: Ac firewall holes Sorry. Where the wire loom is it is about 1 and 1/8 inch. Just measured mine.



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