Need a Non-AC Heater Box

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chazbedlam

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Location
Nampa, ID
First Name
John
Truck Year
Smith
Truck Model
78 K10 Cheyenne
Engine Size
350
Novice here. The heater core in my 78 Chevy K10 started leaking. I purchased a new core and began uninstalling the heater box under the dash to replace it. In the process of taking out the box, I snapped off the last two remaining studs. They basically just crumbled in my hands. The one at the top was already broken off the box. I am discovering that these boxes are unobtanium. I can't find an OER for that box literally anywhere. I was hoping someone on here would have wanted to replace that box and perhaps could provide me with a resource. Or, is this something you have to get from a junkyard?
 

PrairieDrifter

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Suburban k10, bonanza k10, k30, k20, c10, gmc 1/2ton
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350, 350, 350, 350, 350, 350
Yep have to find a parts truck or eBay. Someone here may have one, but shipping would probably be at least $50.

Is yours all cable operated?

Why not just modify yours? Jb weld some bolts in?
 

chazbedlam

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Jan 14, 2025
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Location
Nampa, ID
First Name
John
Truck Year
Smith
Truck Model
78 K10 Cheyenne
Engine Size
350
Yep have to find a parts truck or eBay. Someone here may have one, but shipping would probably be at least $50.

Is yours all cable operated?

Why not just modify yours? Jb weld some bolts in?
Thanks for the information. I wound up finding the broken section of the box and used JB Weld to put it back on. I got back in the truck securely.
 

PrairieDrifter

Full Access Member
Joined
Dec 28, 2014
Posts
4,759
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8,153
Location
North Dakota
First Name
Mason
Truck Year
84,79,77,76,70,48
Truck Model
Suburban k10, bonanza k10, k30, k20, c10, gmc 1/2ton
Engine Size
350, 350, 350, 350, 350, 350
Thanks for the information. I wound up finding the broken section of the box and used JB Weld to put it back on. I got back in the truck securely.
As long as you keep the box from rattling and keep it sealed, no need to worry about it! I did my heater core 10 years ago and it's still kickin with no issues.
 

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