Heater Box Hardware help
 

Hey I am going through my pail of hardware and I can't remember what the proper hardware is for securing the Outer and Inner Heater boxes to the firewall. It has been too long since I took it apart and I have lost some of the pictures I took. So help me out. What is the screws used and any pictures would be a bonus. Thanks for the help, Jeff.

Re: Heater Box Hardware help
 

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1/4" speed nuts for the studs and I think #10 or #12 hex head sheet metal screws for the others. Here is a picture of what they look like. There is one screw missing in the picture.

LockDoc

Re: Heater Box Hardware help
 

Ok. I found those in one of the cups. What about the inner box. Is the screws coming out through the firewall holding it in place similar?

Re: Heater Box Hardware help
 

the bolts on the inside look much the same as the ones that bolt the outer box to the firewall. You also need the 3 little push clips (sorry no pics) that attach the "heater controll cables' to the flapper doors, I lost two of mine and could not find a replacement and ended up using 2 small zip ties to secure the heater control cables to the flapper doors.

Re: Heater Box Hardware help
 

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Here is what the clips look like. They are the same on both ends of the cables. This is the tool I use to get the clips off of the posts. Just work your way around the post pushing up on the inside and they will come off without breaking them.

LockDoc

Re: Heater Box Hardware help
 

Leon. Good tip but too late for me. I already broke a few.
I bought some new I found on ebay. Hope they are the correct size.

Re: Heater Box Hardware help
 

These are the four bolts and nuts that mate the heater and a/c boxes.

Re: Heater Box Hardware help
 

Hey where does the long one go? and should there be one or two of the long ones. I found 2 like that in my cup o' screws.

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Does anyone sell a heater box hardware kit? I need all of it since my truck came without a heater box

Re: Heater Box Hardware help
 

I’ve only seen the gasket sets, but you can probably piece together the hardware from the info on this thread.

Re: Heater Box Hardware help
 

Check out Classic Parts of America, page 87 for the heater cable retainers. .15 ea. They have parts for the hand controls, also have heater box for non A/C. if interested.

Re: Heater Box Hardware help
 

Who is it great to see other people building C10 that are having the same issues I am welcome to the wonderful world of rebuilding vehicles

Re: Heater Box Hardware help
 

My old truck has been sitting for years, if I want to go in and just check the heater box for critters, and rats nests, what's the best approach? It's an AC truck. Do i open the outside part or go under the dash and open it?

Re: Heater Box Hardware help
 

To get to the inside of either heater box you pretty much have to disassemble the whole thing. You can check the incoming side of the system by removing the plastic cap plug on the right side of the interior box (where the control cable goes into the box (see picture)). If it is cold out heat the plug up a little with a heat gun or the wife's hair dryer. (don't tell her I told you this) I have even cleaned them out through this hole with a piece of stiff wire with a small hook bent on the end of it to drag out the big chunks and a shop vac.

Edit: Not sure if the A/C trucks have the same thing or not. I've never had a complete one, just bits and pieces. You may be able to clean the whole system out from the inside on those.

LockDoc

Re: Heater Box Hardware help
 

Great! Thanks for the information! this group is always so helpful.

Re: Heater Box Hardware help
 

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Re: Heater Box Hardware help
 

Tring to take Thrift Air box off the firewall, feels loose but won't lift off 1966 GMC 1000.Help please.

Re: Heater Box Hardware help
 

Any chance you could post a picture of your heater/box?

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Thanks, found the issue and got it done...

Re: Heater Box Hardware help
 

Hey, having to replace heater core also, (pretty sure its first time and I have same screws/nuts that LockDoc posted picture of, 1 screw missing, till I read this I thought the long one was something stuck on sometime, now am wondering same thing, supposed to be 2 long ones and where do they go? The long screw has 3/8 head, 3 short ones are 7/16. Anyone shed more light on it? Thanks! PS, pretty sure they are #12 metal screws, Im going to try 1/4 inch first, due to wear thinking it might be a good fit...

Re: Heater Box Hardware help
 

AC or non-AC? I think they have a different number of fasteners.

Mine were #12's and I had to hammer and dolly the sheet metal flat to get them to tighten up properly.

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Non-a/c, yes, another reason Im going to use 1/4.

Re: Heater Box Hardware help
 

I would run the 1/4" screws in before installing the box just to make sure they thread in nicely before hand. The tabs on the boxes aren't very stout and it's pretty easy to break one. It doesn't take much torque on the screws to hold the box down and if I'm trying to power an oversized screw in normally I'll break something. :lol:

Re: Heater Box Hardware help
 

Yes, before box goes on, 2 tabs broke/were broken when I got the box off, JB weld and they seem solid so far haha, stay tuned...