A/C Evaporator Box Fastener ID - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ThreeQuarter** · 03-20-2023, 10:12 PM

Is this fastener anything more than a 1/4-20 x 2” hex head bolt that is inserted from the inside of the cab?

I’m referring to the threaded fastener that comes through the firewall, then through a spacer, and then through the fiberglass evap box. I have what I think is the remnant of one of these, but its head has rusted off so I’m not sure what’s actually on the other side of the firewall.

**davischevy** · 03-20-2023, 11:30 PM

I may have a better picture.

**davischevy** · 03-20-2023, 11:37 PM

More

**ThreeQuarter** · 03-21-2023, 07:39 AM

Perfect—thank you, Larry! I have that screw in my pile, too. I think the rusty 1/4-20 must be a stud from the bottom of the old heater box.

03-20-2023, 10:12 PM	#1
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,523	A/C Evaporator Box Fastener ID Is this fastener anything more than a 1/4-20 x 2” hex head bolt that is inserted from the inside of the cab? I’m referring to the threaded fastener that comes through the firewall, then through a spacer, and then through the fiberglass evap box. I have what I think is the remnant of one of these, but its head has rusted off so I’m not sure what’s actually on the other side of the firewall. Attached Images __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

03-20-2023, 11:30 PM	#2
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,867	Re: A/C Evaporator Box Fastener ID I may have a better picture. Attached Images __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

03-20-2023, 11:37 PM	#3
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,867	Re: A/C Evaporator Box Fastener ID More Attached Images __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

03-21-2023, 07:39 AM	#4
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,523	Re: A/C Evaporator Box Fastener ID Perfect—thank you, Larry! I have that screw in my pile, too. I think the rusty 1/4-20 must be a stud from the bottom of the old heater box. __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

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