Hole for cowl damper (A/C) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ThreeQuarter** · 03-17-2021, 05:50 PM

The body shop gave me some new cowl sheet metal and I need to drill the front hole for my A/C fresh air damper. Would someone be able to measure their A/C pickup's firewall and tell me where I should drill this hole? I only need to find the front hole (towards engine bay), not the rear hole (toward pass. compartment). See arrow in attached pic. Thanks in advance.

**ThreeQuarter** · 03-19-2021, 06:44 PM

To be clear, the pic above is not mine, but shows the hole I need to drill. If you’re in your garage this weekend with a tape measure close at hand, I’d appreciate it!

**402Bowtie** · 03-19-2021, 08:46 PM

I measured 1" from edge to center of the big hole in first pic.

Then 8.25" from edge to center in second pic.

Let me know if you need a different reference point.

**ThreeQuarter** · 03-19-2021, 10:37 PM

That’s perfect, thank you!

Lanman1972 · 03-20-2021, 01:01 PM

IF we're in the garage! Good one!

03-17-2021, 05:50 PM	#1
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,523	Hole for cowl damper (A/C) The body shop gave me some new cowl sheet metal and I need to drill the front hole for my A/C fresh air damper. Would someone be able to measure their A/C pickup's firewall and tell me where I should drill this hole? I only need to find the front hole (towards engine bay), not the rear hole (toward pass. compartment). See arrow in attached pic. Thanks in advance. Attached Images __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

03-19-2021, 06:44 PM	#2
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,523	Re: Hole for cowl damper (A/C) To be clear, the pic above is not mine, but shows the hole I need to drill. If you’re in your garage this weekend with a tape measure close at hand, I’d appreciate it! __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

03-19-2021, 08:46 PM	#3
402Bowtie Registered User Join Date: Sep 2003 Location: Wichita, KS Posts: 3,735	Re: Hole for cowl damper (A/C) I measured 1" from edge to center of the big hole in first pic. Then 8.25" from edge to center in second pic. Let me know if you need a different reference point. Attached Images __________________ Link to Parts I am Selling Build Date Thread: GMC, 68-71 Chevy, 72 Chevy

03-19-2021, 10:37 PM	#4
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,523	Re: Hole for cowl damper (A/C) That’s perfect, thank you! __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

03-20-2021, 01:01 PM	#5
Lanman1972 Registered User Join Date: Dec 2013 Location: Omaha NE Posts: 620	Re: Hole for cowl damper (A/C) IF we're in the garage! Good one! __________________ 1972 C10 Custom Deluxe LWB, 402/400, PS, PB, A/C, Highlander, Hugger / White 1971 C10 Cheyenne LWB (SWB), 350/350, PS, PB, A/C, Dark Olive / White.

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