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51 GMC heater controls
#611000 Mon Jan 18 2010 07:07 AM
Joined: Jan 2010
Posts: 2
J
New Guy
Hey guys,

I'm helping a friend restore his 51 GMC. We found new heater controls and are having a difficult time installing them. My question is, can anyone tell me where to mount the capillary tube? Does it drop into a heater duct?

Ok, I'll admit here that I was born in '73. What does this capillary tube do? How does it work? I have the factory manuals for this truck and they aare not telling me anything about these kinds of controls.

Any help here would be appreciated. Thanks

Dan


Why is there never enough time to do the job right the first time, but always time to do it again?
Re: 51 GMC heater controls
Justaguy #611049 Mon Jan 18 2010 03:44 PM
Joined: May 2001
Posts: 8,386
Extreme Gabster
The capillary tube controls the heater valve.

It mounts in the open under the dash but I'm not sure how on an original truck. Mine is just propped up on a cable.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
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Re: 51 GMC heater controls
Cletis #611058 Mon Jan 18 2010 04:45 PM
Joined: Sep 2001
Posts: 30,561
ace skiver
Dan,

The the tube usually has a little tab (with a hole in it) near the end. As cletis describes, instruction 8 and figure 99 in the 1951 Che Accessory Installation Manual indicate that a screw through that tab is attached to the "dash mat" (the interior firewall cover - near the middle-on-passenger-side, lower down on the mat/cover). You'll see from the diagram/picture that the excess length of the tube is coiled.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 51 GMC heater controls
tclederman #611070 Mon Jan 18 2010 05:13 PM
Joined: Sep 2006
Posts: 3,737
B
Shop Shark
Here is a photo of the original location on a very original truck (49 Chevrolet), I have sold four deluxe heater set-ups this year and they all looked like this.
49 Chevrolet (1)
50 Chevrolet (1)
54 Chevrolet (1)
49 GMC (1)

https://www.flickr.com/photos/advance-design_parts_co/8129370372/in/album-72157631868452754/

Re: 51 GMC heater controls
Brad Allen #611074 Mon Jan 18 2010 05:25 PM
Joined: Jan 2010
Posts: 2
J
New Guy
Wow

Thanks guys for your fast response. The diagrams and pics are just what I needed

thanks again


Why is there never enough time to do the job right the first time, but always time to do it again?
Re: 51 GMC heater controls
Justaguy #611079 Mon Jan 18 2010 05:41 PM
Joined: Apr 2009
Posts: 549
H
Shop Shark
Tim, thank you for posting that page. I went there to learn about the heater and found out how to mount my new to the truck defrost inlets. These projects would sure be more difficult without all the help we get from this forum.

Chuck

Re: 51 GMC heater controls
Brad Allen #1340446 Sat Jan 04 2020 04:53 PM
Joined: Dec 2007
Posts: 145
D
Shop Shark
Realize this post is quite old, but does anyone have the pics or access to those from Brad Allen above? I see the instructions and diagrams from the Accessories Installation Manual, was just interested in the pic of an original install. Webshots link doesn't work and his album, while awesome, is like 168 pages smile

Thx,
Derek

Re: 51 GMC heater controls
Justaguy #1340481 Sat Jan 04 2020 10:28 PM
Joined: Sep 2006
Posts: 3,737
B
Shop Shark
Here you go, I also updated the webshots 🤬 link above in case this ever gets resurrected again.
https://www.flickr.com/photos/advance-design_parts_co/8129370372/in/album-72157631868452754/

Re: 51 GMC heater controls
Justaguy #1340507 Sun Jan 05 2020 12:45 AM
Joined: Dec 2007
Posts: 145
D
Shop Shark
Awesome Brad, thx much sir!

Derek

Re: 51 GMC heater controls
Brad Allen #1368089 Tue Jul 07 2020 11:26 AM
Joined: Mar 2008
Posts: 254
C
Shop Shark
And thanks Brad Allen - I happened on this thread while searching for where that pesky tube was supposed to be mounted after it was left dangling in the air by the restorer before me on my old (but almost like new) 48 one ton. Your preservation of this old stuff, and keeping it available for sticklers like me, and apparently like Derek, is, well, it’s like priceless.

Dale

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