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Old 05-17-2007, 02:05 AM   #1
dewdew
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Help with heater ducting/controls

I need help putting my heater back together. Is there a diagram somewhere that shows the heater ducting routes and how each of the three cables go? My truck is a '71 c20 cheyenne with A/C. My Haynes helps me none and I have searched high and low. Thanks
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Old 05-17-2007, 07:18 AM   #2
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Re: Help with heater ducting/controls

Send off for a LMC parts book http://www.lmctruck.com/. their kinda expensive and most guys don't buy from them, but their parts book show really good exploded views of most everything. You can also get an assembly manual from most of the vendors on this board. Click on the link below.
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Old 05-17-2007, 02:50 PM   #3
dewdew
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Re: Help with heater ducting/controls

you're right, they do show the ducting routing, but not which cable goes where.....
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Old 05-17-2007, 03:46 PM   #4
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Re: Help with heater ducting/controls

DewDew,

Here are a couple of pictures. The top one goes to the front control arm, the middle one goes behind the heater box and to the bottom, and the bottom one goes around the heater box and into the heater box by the firewall.

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Old 05-21-2008, 04:28 AM   #5
harlyworkr
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Re: Help with heater ducting/controls

What about an AC truck? Could someone post pictures for that setup please?
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Old 07-24-2015, 12:26 AM   #6
DanbyRaider
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Re: Help with heater ducting/controls

I know that this post is 7 years old but I am in need of some related information for a '71 stock AC truck. Hopefully one of you fine gentlemen can share some wisdom with me.
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Old 07-24-2015, 04:43 AM   #7
F.A.A.benny
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Re: Help with heater ducting/controls

What info are you needing?
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Old 07-24-2015, 05:22 AM   #8
SS Tim
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Re: Help with heater ducting/controls

71 Factory Service Manual has a very good section on th A/C system.
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Old 11-05-2015, 02:48 AM   #9
SonomaComa
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Re: Help with heater ducting/controls

Quote:
Originally Posted by LockDoc View Post
DewDew,

Here are a couple of pictures. The top one goes to the front control arm, the middle one goes behind the heater box and to the bottom, and the bottom one goes around the heater box and into the heater box by the firewall.

LockDoc
Where can that piece on the right be purchases at? The one that attaches to the inside of the cab to the firewall to the Heater Box in the Engine Compartment? All I can seem to find is Part #AP7221 which looks NOTHING like what is in the Heater Duct system without A/C.
http://www.classicindustries.com/sho...c-heater/?&p=9
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Old 11-05-2015, 12:08 PM   #10
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Re: Help with heater ducting/controls

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Originally Posted by SonomaComa View Post
Where can that piece on the right be purchases at? The one that attaches to the inside of the cab to the firewall to the Heater Box in the Engine Compartment? All I can seem to find is Part #AP7221 which looks NOTHING like what is in the Heater Duct system without A/C.

Welcome to the board....

If you go to the 67-72 pickup parts forum on here there are quite a few guys parting out trucks that would have one for sale....

Here is a post with some heater parts for sale:

http://www.67-72chevytrucks.com/vboa...d.php?t=687442

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Last edited by LockDoc; 11-05-2015 at 12:16 PM.
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Old 08-31-2017, 11:19 PM   #11
bw46
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Re: Help with heater ducting/controls

Quote:
Originally Posted by LockDoc View Post
DewDew,

Here are a couple of pictures. The top one goes to the front control arm, the middle one goes behind the heater box and to the bottom, and the bottom one goes around the heater box and into the heater box by the firewall.

LockDoc
I know this is an old thread but i just came across it and I wanted to say thanks. Very helpful.
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Old 09-01-2017, 12:02 AM   #12
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Re: Help with heater ducting/controls

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Originally Posted by bw46 View Post
I know this is an old thread but i just came across it and I wanted to say thanks. Very helpful.

No problem. Glad people are still getting use out of it....

Thanks,
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Old 03-14-2019, 07:11 PM   #13
67chevemall
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Re: Help with heater ducting/controls

Quote:
Originally Posted by LockDoc View Post
DewDew,

Here are a couple of pictures. The top one goes to the front control arm, the middle one goes behind the heater box and to the bottom, and the bottom one goes around the heater box and into the heater box by the firewall.

LockDoc
except the short cable goes in the middle not on the defrost
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Old 03-14-2019, 10:13 PM   #14
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Re: Help with heater ducting/controls

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Originally Posted by 67chevemall View Post
except the short cable goes in the middle not on the defrost

I won't say you are wrong, I will say you may be partially right. The OP asked about a '71 A/C truck which I overlooked, so my pictures are for a '71 with the Deluxe Air Heater and no A/C. The cables and routing in the pictures are correct for that truck. I have another '71 which I am the 2nd owner of. I have the heater box loose from the firewall to clean out a mouse nest but the original cables are still connected to the heater box. I just went out and double checked it and the cables are in the same location and connected exactly like the pictures I posted above, with the short cable going from the defrost lever to the defrost door on the front of the heater box. The short cable will not reach the lever on the bottom of the heater box for the air door. The cables on a truck with the Standard Heater may be different, and there may be some differences between years, but I stand by my information as posted above....

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Last edited by LockDoc; 03-14-2019 at 10:21 PM.
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