Mysterious mounting spot on middle of firewall - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**dflarsen77** · 07-09-2016, 03:14 PM

This is the interior, right in the center of the firewall, right above the trans hump.

Anyone know what would have gone here? It's a 1970 C10, has factory 4 season AC. I figure it might have been some kind of AC related relay maybe, but it's mounted in a place that's kind of easy to see, not neatly tucked out of the way. But half of the AC system is taken out so I don't know what it could be. The factory service manual shows an AC relay tucked away on the right side behind the dash. So I really have no idea, hoping some bros might know

**RodnRudy** · 07-09-2016, 03:51 PM

On my 68 C10 that hole is for the left side mounting point for the inner heater box. Mine is a non A/C but I think the mounting points would be the same

BugzC10 · 07-09-2016, 05:48 PM

Quote:

Originally Posted by RodnRudy

On my 68 C10 that hole is for the left side mounting point for the inner heater box. Mine is a non A/C but I think the mounting points would be the same

Same here on my 70...

tommys72 · 07-09-2016, 06:00 PM

The above statements are correct. Thats what its there for

davepl · 07-09-2016, 07:56 PM

Something has melted the insulation on your green and brown wires, which are either heater or headlights. Looks like a short waiting to happen, you might want to tape those up.

**dflarsen77** · 07-09-2016, 08:09 PM

Thanks guys, and I hadn't even noticed the wires. The wiring harness is generally in shambles. I'll be taking a closer look at a lot of the exposed parts.

07-09-2016, 03:14 PM	#1
dflarsen77 Active Member Join Date: Jun 2016 Location: Salida, CA Posts: 177	Mysterious mounting spot on middle of firewall This is the interior, right in the center of the firewall, right above the trans hump. Anyone know what would have gone here? It's a 1970 C10, has factory 4 season AC. I figure it might have been some kind of AC related relay maybe, but it's mounted in a place that's kind of easy to see, not neatly tucked out of the way. But half of the AC system is taken out so I don't know what it could be. The factory service manual shows an AC relay tucked away on the right side behind the dash. So I really have no idea, hoping some bros might know

07-09-2016, 03:51 PM	#2
RodnRudy Senior Member Join Date: Oct 2014 Location: New Palestine In Posts: 932	Re: Mysterious mounting spot on middle of firewall On my 68 C10 that hole is for the left side mounting point for the inner heater box. Mine is a non A/C but I think the mounting points would be the same

07-09-2016, 06:00 PM	#4
tommys72 Registered User Join Date: Jun 2012 Location: springfield mo Posts: 3,076	Re: Mysterious mounting spot on middle of firewall The above statements are correct. Thats what its there for __________________ United States Marine Corps 2000-2011 Iraq and Afghanistan veteran Just living life now and enjoying it and my wife, daughter and son

07-09-2016, 07:56 PM	#5
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,334	Re: Mysterious mounting spot on middle of firewall Something has melted the insulation on your green and brown wires, which are either heater or headlights. Looks like a short waiting to happen, you might want to tape those up. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

07-09-2016, 08:09 PM	#6
dflarsen77 Active Member Join Date: Jun 2016 Location: Salida, CA Posts: 177	Re: Mysterious mounting spot on middle of firewall Thanks guys, and I hadn't even noticed the wires. The wiring harness is generally in shambles. I'll be taking a closer look at a lot of the exposed parts.

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