Heater Box Removal - Vintage Mustang Forums
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post #1 of 31 (permalink) Old 08-02-2019, 07:58 PM Thread Starter
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Heater Box Removal

I will be installing A/C in my '66 coupe that is a non A/C car. I thought that I would go ahead before that and remove the heater box to put new seals, clean up, etc. before covering it up with the Evaporator.

In reading instructions and looking at my heater box, I've got a couple of questions on the attached photos.

First, are the hoses correct? I believe that they were replacements and not original factory.

Second, is that some factory sealer around the portion of the unit that protrudes into the engine compartment and how do I properly dislodge it? and what is it so I can put it back they it's suppose to go. (Well 3 questions I guess)
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You never know until you ask.

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post #2 of 31 (permalink) Old 08-02-2019, 08:09 PM
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That's undercoating. It could have been put on by the dealer when sold new or any time after that. Just use a putty knife or what ever to clean it up enough to remove. Yes those are replacement hoses. Install new ones with the heater box. They should be replaced periodically.

I'd suggest while you have everything apart do yourself a favor and service the fan motor. You will need a Allen wrench set to remove the fan. On the other end IIRC a 11/32 socket to remove the end Bell on the motor. Don't worry nothing is going to pop out. It's just a shell held on by the two nuts. Oil both ends of the motor bearings. It makes a difference.
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post #3 of 31 (permalink) Old 08-02-2019, 11:23 PM
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In addition to @Huskinhano 's good advice (as normal), I'd suggest replacing the heater core unless that's been done recently. Nothing worse that ruining a perfectly good carpet because the core decided it was finished with this life. Also check on the heater and cowl seals and replace them if you deem it necessary. It's such a pain to drop that heater box that basic restoration is a good idea anytime you do it. It's not fancy and it doesn't show, but the peace of mind having done that work is worth it in my opinion.


As for your questions: completely agree that the hoses should just be replaced. I'm a little suspect of that substance on the firewall. It does look like undercoating, but it's not evenly coating the firewall. I'm wondering if that was laid down to cover something up. Once again I agree with Tom that you should scrape it off. I'm hoping a previous owner used it to seal the heater and hoses (which isn't a good way to do that, but whatever). If you get down to bare metal make sure you treat the metal with new primer / paint so it doesn't rust.
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post #4 of 31 (permalink) Old 08-03-2019, 12:32 AM
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Best heater box rebuild kit is the one made by Daniel Carpenter Reproductions and is available from NPD and some other suppliers. Use quality Motorcraft, Gates, or Dayco hoses for frequently driven cars and maybe the original type ribbed, or white or yellow stripe reproduction hose for the restored ride. Use top quality worm type stainless band clamps for the inside hose application and clock them so they could be removed easily from underneath if needed in the future without having to take the whole box out.

My 1st car...
'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
•Dual Exhaust •Quick Manual Steering
•Rally Pac •Console •Deluxe Belts
•LOTS of Rotunda accessories

Older son's 1st car...
'66 Emberglo / Parchment deluxe coupe
•289 / 2100 •C4 Auto
•Dealer A/C • Console
•Dual Exhaust • Power Steering

Younger son's 1st car...
'66 Nightmist / Blue & white deluxe coupe
•289 / 2100 •C4 Auto
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WAITING FOR RESTORATION


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post #5 of 31 (permalink) Old 08-03-2019, 12:55 AM
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Recommend you remove the glove box prior to the heater. It’s the best way to get to the hard to reach top mount on the heater box.

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post #6 of 31 (permalink) Old 08-03-2019, 01:29 AM
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Some videos that helped me when I replaced my heater core and refurbished my heater box on a 1968 coupe w/factory AC.



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post #7 of 31 (permalink) Old 08-03-2019, 04:42 AM
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Unless your plan is to install an oem style under dash A/C system the heater box will get removed and replaced with new stuff. Just one guys opinion here but unless the original look of the factory A/C is important to you, I feel the more modern underdash A/C systems are far better.

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post #8 of 31 (permalink) Old 08-03-2019, 09:20 AM
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That's undercoating. It could have been put on by the dealer when sold new or any time after that. Just use a putty knife or what ever to clean it up enough to remove. Yes those are replacement hoses.


agree on the hoses. but that is factory applied sealer not undercoating. all cars received a healthy dose on the firewall. some more than others. all items protruding thru firewall were supposed to get sealed. undercoating is a product applied at the dealer or aftermarket level usually on the underside only. spray can 3M can be used for replacement.
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post #9 of 31 (permalink) Old 08-03-2019, 10:58 AM
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The Original Undercoating breaks/cracks easily....You just have to push on it....

"First, are the hoses correct?"

No they are not. Not even close.

Correctly, ALL "Factory" A/C equipped Mustangs 1964.5 thru 1968 had either One hose Black with a White Stripe, and the other hose was Black with a Yellow Stripe.....Or Both 2 Hoses were Black with Yellow Stripes. You'd have to check Year, Plant and time Period for correctness on the colors.


ALL NON-A/C cars from 1964.5 thru 1968 had both hoses Black with White Stripes.

To buy the correct hoses, You can buy them from Kevin Marti's website "Marti Autoworks", or you can buy them thru NPD which also carries them as well. While you are there buying the hoses, Buy the correct WITTEK Factory correct hose clamps as well. They sell them in kits. Both Marti and NPD carry those as well.

)

Tony K.
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post #10 of 31 (permalink) Old 08-03-2019, 11:18 AM
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When I rebuilt my heater box I took out the passenger seat. The extra room to work was a godsend. Also if you desire, when buttoning up the installation, put some black 3M strip caulk around the heater hoses where they enter the firewall to seal it up. This was done at the factory.
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post #11 of 31 (permalink) Old 08-03-2019, 11:45 AM
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Don't forget to reach up into the cowl and clean out whatever pine needles or
stuff that made its way in over the years .
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post #12 of 31 (permalink) Old 08-04-2019, 09:32 PM Thread Starter
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Thanks to all of you for passing on some knowledge. Now I'm going to replace everything in the box as well as the heater core. But having decided all of this ahead of pulling the box, I was doing some scraping under the hood on the firewall and then some more looking. And then it hit me as I was looking at the heater hoses. They aren't hooked up and there is a hose looped. So I am assuming that the heater core definitely needs replacing as I'm assuming that it leaks.
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File Type: jpg IMG_7641.jpg (475.7 KB, 9 views)

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post #13 of 31 (permalink) Old 08-04-2019, 11:38 PM
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While you are there ordering a new Daniel Carpenter Heater Box "Re-Seal" Kit. Don't to forget order the Heater Box Heater Core "End Caps". Everyone always forgets them...(100 People right now are going...What End Caps?!??) and they are an essential part!! They keep your Heater core from banging around!..while you drive around!

See below:

1965-1968 without Factory A/C:

65-68 HEATER CORE FOAM END CAPS SET OF 2


1967-1968 with Factory A/C:

67-68 HEATER CORE FOAM END CAPS SET 0F 2 - USE WITH FACTORY AC


)

Tony K.
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post #14 of 31 (permalink) Old 08-05-2019, 12:47 AM
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"So I am assuming that the heater core definitely needs replacing as I'm assuming that it leaks. "

I'd say that's a fair assumption!

Here is a Heater Hose Routing "Flow" chart to help everyone out....so there's no confusion.....

)

Tony K.
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Tony Kovar
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1965 Mustang Convertible 200cid I6, 3spd Manual (Soon to be swapped for a '65 Date Coded C4!)
1966 Mustang Sprint 200 Registry Owner/Moderator
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post #15 of 31 (permalink) Old 08-05-2019, 10:12 AM Thread Starter
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Quote:
Originally Posted by NEFaurora View Post
"So I am assuming that the heater core definitely needs replacing as I'm assuming that it leaks. "

I'd say that's a fair assumption!

Here is a Heater Hose Routing "Flow" chart to help everyone out....so there's no confusion.....

)

Tony K.
Thanks for the diagram, that helps a lot when trying to learn.
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