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66 gto heater box

  
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66 gto heater box

 
bellyache bellyache
New User | Posts: 31 | Joined: 08/13
Posted: 01/12/14
02:45 PM

I was installing a new heater core and found it had been apart before and installed it was put in over the jut mat and thinking was it should be firewall to gasket box because I could see a small sign of some leakage and is a pain to change can you guys confirm my thinking  

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 01/12/14
03:20 PM

I looked at my 69 Chevelle the heater core has never been taken out and the heater box is over top of the jute mat . I bought the car in 83 off of the original owner .  

SlickTwister SlickTwister
New User | Posts: 3 | Joined: 01/14
Posted: 01/12/14
04:23 PM

Do you mean that the jute is in between the heater box and firewall? That doesn't seem right, what good is the gasket then? It seems to me the box should be sealed to the fire wall just in case the heater core leaked.  

wayne712222 wayne712222
Moderator | Posts: 235 | Joined: 10/13
Posted: 01/12/14
04:35 PM

here is an image from a 69 firebird.. probably without AC..

69Firebirdfirewallmat Zpsd4b9abd0

Heatercoreinsulator Zps3823739b  

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 01/12/14
05:29 PM

You can see the holes for the heater box on the firewall pad in the diagram the rubber side seals the heater box . It doesn't matter how good you seal it if you have a leak it's going to leak inside the car .  

4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 01/12/14
05:39 PM

So the gasket goes in between the box and the jute padding?

Grin  
Poncho huggen gear snatchen posi piro.

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 01/12/14
06:45 PM

This is a factory original heater box that's never been apart but needs to be taken apart it started leaking last year. I have it bypassed not bad for a 45 year old heater core .The gasket go's on the box because it's made like a valve cover it's not flat .Then the whole thing go's on the firewall jute padding on the rubber tar Heaterbox69005 Zps578c44cbpaper like side .  

4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 01/12/14
07:02 PM

Gotcha...thanks Jack, Bellyache asked that question on his overheating thread and I obviously answered him incorrectly but luckily did ask him repost his question in a separate thread to get other opinions. Good thing, see there Belly.

Grin  
Poncho huggen gear snatchen posi piro.

idrivejunk idrivejunk
Addict | Posts: 5148 | Joined: 12/09
Posted: 01/12/14
08:09 PM

That got me too. I reckon thats why you get wet carpet when they go. Right or wrong, when I personally build up a car I stick the box to the paint.  
idrivejunk

4zpeed 4zpeed
Enthusiast | Posts: 368 | Joined: 04/13
Posted: 01/12/14
08:28 PM

That's a excellent suggestion Mat, one may want to keep a eye on clearance of the heater core and tubes, looks like the box may move forward as much as 1/2 inch or better depending on how thick the jute is.

Grin  
Poncho huggen gear snatchen posi piro.

wayne712222 wayne712222
Moderator | Posts: 235 | Joined: 10/13
Posted: 01/12/14
11:52 PM

build it up with closed cell foam weather stripping tape...  or camper tape..

this stuff is like 8 bucks a roll at HD

A9f6c71f B0ae 4Cbe 8C99 Dbd1268ea1e4 1000


Armacell 2 in. x 30 ft. R-1 Foam Insulation Tape
Model # TAP18230
Store SKU # 329131
this is also the proper tape to wrap around heater cores...


this is also available for 4 bucks

Cec6e0bd C2e7 44D1 Bde8 74Fe98610c3c 1000

Frost King E/O 3/4 in. x 7/16 in. High-Density Rubber Foam Weatherstrip
Model # R734H
Internet # 100047977
Store SKU # 226270  

idrivejunk idrivejunk
Addict | Posts: 5148 | Joined: 12/09
Posted: 01/13/14
06:00 AM

Yep, camper tape is what I usually find back there. Soggy and no longer stuck! Whichever material I find on the day I mount the box will do, whether its ribbon sealer or camper tape. 4Z- thats right, you gotta make sure nothing binds up when you bolt it down! These are the kind of questions that assembly manuals are good for. Personally, I just want a real seal there to force leaking coolant to go somewhere else.  
idrivejunk

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 01/13/14
01:24 PM

I wouldn't make the heater box a water tight seal because you'll get antifreeze everywhere if you get a leak .It will get all over the windshield and in your whole heater system . Better to just let it run out the back of the firewall pad and on the floor . The heater core is in the heater box inside the car and the heater box sits lower than the hole in the firewall so your going to get antifreeze in the car unless you have a drain and most of them don't work right or get clogged . Best drains I've seen are the one's where the box dips down and there's a hole cut in the firewall with a drain hose .Older cars don't have drains like this .  When my heater core leaked in my Chevelle it never got on my windshield it just leaked on the floor .If you have a water tight seal it will build up and you'll get antifreeze everywhere when the fan blows it around . I don't know if GM made it like that on purpose but when you get a leak it just runs out the back of the firewall pad and is easy to see . Best bet is to just buy a good make heater core .And only make the box air tight .  

Brazil Brazil
Addict | Posts: 3951 | Joined: 06/09
Posted: 01/13/14
05:18 PM

I usually smell the familiar scent and hear the familiar szzzzzzzz when the radiator or heater box starts leaking. I stuff a small rolled up towel under the box and see how wet it gets over a day or two. It at least keeps the carpet and floor pan from getting soaked before I can fix it.  

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 01/13/14
05:46 PM

A towel works good just don't try to make the heater box water tight . When I find a leak I just bypass the heater core .  

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