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Old 09-02-2016, 10:15 PM   #1
saxart
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Heater Box Question

Quick heater box question...

Should this door/flapper have some sort of a gasket on it? (Mine does not) And, yes that is a rust hole in just above the door in this picture. Grrrrr.... LOL

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Old 09-02-2016, 10:37 PM   #2
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Re: Heater Box Question

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Originally Posted by saxart View Post
Quick heater box question...

Should this door/flapper have some sort of a gasket on it? (Mine does not) And, yes that is a rust hole in just above the door in this picture. Grrrrr.... LOL

Yes, it should have a seal around the edges....

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Old 09-02-2016, 11:07 PM   #3
leftybass209
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Re: Heater Box Question

Lockdoc is correct. Further, companies carry rebuild kits for the heater boxes. I rebuilt mine, and it did make a noticeable difference in the amount of directed air.
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Old 09-03-2016, 05:27 AM   #4
Shaky
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Re: Heater Box Question

Here's a thread I refer to often as I'm getting ready to do my heater box:

http://67-72chevytrucks.com/vboard/s...ghlight=heater
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Old 09-03-2016, 07:52 AM   #5
saxart
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Re: Heater Box Question

Thanks for the thoughts guys. Guess I'll have to order a seal kit. I didn't realize they come with a heater door seal as well.

Another question...

Does anybody make reproduction "tin parts" for these heater boxes? As you can see, there is a hole below the blend door on the one piece, and the other piece has quite a bit of rust where the motor seal glues on.
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Old 09-03-2016, 12:25 PM   #6
71CHEVYSHORTBED402
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Re: Heater Box Question

Gaskets:
1. A rectangular rubber foam gasket fits inside the RH (TS) box. It seats between both boxes.

2. A rubber foam gasket fits between the firewall and the rear of both boxes. This fastens to the RH box. With the RH (TS) box mounted, the gasket inserts into the LH (TS) box.

3. A roughly round rubber foam gasket fits between the front of the RH (TS) box and the blower motor.

4. A foam rubber gasket fits along the perimeter between both sides of the box. This is round and narrow. Cut to fit.

5. A rubber ring (i.e., gasket) inserts into the back of the RH (TS) box for the hole for the blower. Correct positioning is the widest portion of the ring faces the firewall.

Note: With possible exception of #4, the gaskets are cemented.
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71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

Last edited by 71CHEVYSHORTBED402; 09-03-2016 at 12:42 PM.
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Old 09-03-2016, 08:42 PM   #7
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Re: Heater Box Question

Thanks 71Shortbed!
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Old 09-03-2016, 11:11 PM   #8
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Re: Heater Box Question

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Originally Posted by saxart View Post
Thanks for the thoughts guys. Guess I'll have to order a seal kit. I didn't realize they come with a heater door seal as well.

Another question...

Does anybody make reproduction "tin parts" for these heater boxes? As you can see, there is a hole below the blend door on the one piece, and the other piece has quite a bit of rust where the motor seal glues on.
I don't think that the gasket kit includes a rubber gasket for that door. And no one to my knowledge has reproduction metal panels for sale individually although there are complete reproduction heater boxes available. Here is one is restored a little while back
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Old 09-04-2016, 12:15 AM   #9
71CHEVYSHORTBED402
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Re: Heater Box Question

Do you guys recommend attaching the entire evap. box to the fire wall in one piece? I took the LH truck side off first, then removed the RH side with the evap. core. Seems with that rear gasket it might be best to install the entire unit.
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71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025
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Old 09-04-2016, 12:18 AM   #10
F.A.A.benny
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Re: Heater Box Question

yes its best to install it as one piece
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Old 09-04-2016, 12:26 AM   #11
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Re: Heater Box Question

I have a heater box you can have if you want to pay for shipping.
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Old 09-04-2016, 07:18 AM   #12
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Re: Heater Box Question

Clemsonteg-
Thanks! What a generous offer. (This is such a great forum!) I just sent you a PM.
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Old 09-04-2016, 11:45 AM   #13
71CHEVYSHORTBED402
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Re: Heater Box Question

Quote:
Originally Posted by F.A.A.benny View Post
yes its best to install it as one piece
Thanks Benny
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