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Unread 11-25-2008, 02:18 PM   #1
cjdriver79
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1979 CJ7 
 
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How To Change CJ7 Heater Core w/out Removing Dash

Hi all,
My heater core went out last summer so I just bipassed it. Now that winter is here it may be about time to replace it.

I drive a 1979 CJ7, I recently just installed a dual-battery tray and have the throw switch for the two wired to my glove box (including my fuse panels). It would be really nice to not have to rip out all that wiring to get to the heater core.

Any tips on the easiest way to change it? Or just a step-by-step on the process. Both of the manuals I have don't cover heater core changing so I'm walking in the dark on this one.

All help would be appreciated. Thanks!

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Unread 11-25-2008, 02:42 PM   #2
Smtty58
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I pulled mine out with the dash in place, just removed the glove box liner. That gives you just enough room to wiggle it out.
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Unread 11-25-2008, 02:53 PM   #3
whittlecj
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One of the many recent threads on heater core removal...

http://www.jeepforum.com/forum/showt...ht=heater+core

Use the search function, you'll find plenty of help!
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Unread 11-25-2008, 03:00 PM   #4
jeepmaniac
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I believe the only way to replace the heater core is to remove the heater box assembly from the interior. There are 5 or 6 nuts on the engine bay side of the firewall that must be removed to get the box out (spray the nuts with Deep Creep or something similar because these are studs welded to the heater box cover). There are several screws that attach the cover to the box (that are on the firewall side of the box - can't get at them without removing the box). The core is inside. I think you must disconnect the heater control cables and the defrost duct also. You may need to take the glove box out to have enough room to slide the box back and get it out.
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Unread 11-25-2008, 03:44 PM   #5
78treehugger
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There are 4 nuts on the inside of the firewall. Not sure how your wiring is done but I don't think I removed my glove box when I did my upgrade and replaced the heater core. And you do have to remove the whole black box assembly.
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Unread 11-25-2008, 04:05 PM   #6
cjdriver79
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Quote:
Originally Posted by whittlecj View Post
One of the many recent threads on heater core removal...

http://www.jeepforum.com/forum/showt...ht=heater+core

Use the search function, you'll find plenty of help!
I tried searching "Heater Core" "Heater+Core" "Heatercore" and "heater" and had no luck finding anything that I could use, that's why I started the new post.

I found 4 1/4-20 bolts sticking out of the firewall and put some deep-penetrating oil on them. Hopefully tomorrow they'll free up enough to loosen. Looks like I will have to take out my switch (a.k.a glovebox) I'll try and post some photos of my process for everyone.

Thanks,
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Unread 11-25-2008, 04:26 PM   #7
mjfitz99
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I tried to replace my heater core last winter but the nut that is behind the valve cover turned in place so i now have to cut that one off. So, be gentle
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Unread 11-25-2008, 04:29 PM   #8
newjeepowner
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I recently did the blower upgrade but didn't change the core. I didn't have to remove the dash or the glovebox.

Took out the battery and tray (you might not need to do this but it improves visibility), located the bolts and disconnected the hoses to the core from the engine side.

Inside, disconnected the heater box cables (3) and wiggled out the whole black heater case without too much difficulty but did have to finesse it a bit.

good luck!
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Unread 11-25-2008, 04:35 PM   #9
whittlecj
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Quote:
Originally Posted by cjdriver79 View Post
I tried searching "Heater Core" "Heater+Core" "Heatercore" and "heater" and had no luck finding anything that I could use, that's why I started the new post.

Thanks,
Funny, when I searched for heater core I came up with many on the first page that explain it, including the one I posted. I dunno if this works, but here are my search results. I just had this on my mind because winter weather has got quite a few posting about it over the past couple weeks.

http://www.jeepforum.com/forum/searc...archid=3331621

Anyway, more pics and a better write up will always serve people better!
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Unread 11-02-2012, 03:36 PM   #10
86cjlaredo
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What is the blower motor upgrade for the cj7? I think or heard its from a Chevy blazer but not sure. If anyone has any idea please shoot me an email.
Thanks!
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Unread 11-02-2012, 04:41 PM   #11
Ken4444
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Quote:
Originally Posted by 86cjlaredo View Post
What is the blower motor upgrade for the cj7? I think or heard its from a Chevy blazer but not sure. If anyone has any idea please shoot me an email.
Thanks!
If you Google "jeep cj heater blower motor upgrade" you'll get plenty of information.

The basic idea is that you can use the correct blower motor from a Blazer. This will move a lot more air than the stock motor, however you need to enarge the hole in the firewall.
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Unread 11-02-2012, 05:49 PM   #12
DucST4
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I found it was easier to remove the heater box assembly with the passenger seat removed. Standing on the outside and leaning into the CJ and fighting with the box was hard on the back.
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Unread 07-07-2015, 02:18 PM   #13
85cjowner
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Smile Removing the heater box assy

You need to pull out the heater box assembly.


On the CJ7 there are 4 nuts on the firewall that will allow the unit to be pulled out. No fasteners located inside the passenger compartment.


One of the 4 nuts is directly behind the valve cover on the center of the firewall (4.2L) engine.
Disconnect the blower motor quick connect on the firewall below the battery tray.
Disconnect heater hoses (obvious)
Remove the 90 degree rubber overflow tube below battery shelf.
Disconnect the 3 linkages inside on passenger side. Removing the passenger seat is wise as it gives you more access.
Remove the glove box
I also removed the battery and tray and this made it easier.
Place the unit on you bench and remove the back plate to gain access to the core (about 10 hex head screws).
Replace the core and install back plate (be sure to align the 2 damper pivot shafts into the holes on the back plate).
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Unread 07-07-2015, 08:46 PM   #14
CSP
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Umm, I hope the OP got the job done, given this thread is almost seven years old!


Check the dates before replying newb.
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Unread 07-08-2015, 08:56 AM   #15
shadoow
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Quote:
Originally Posted by CSP View Post
Umm, I hope the OP got the job done, given this thread is almost seven years old!


Check the dates before replying newb.
85cjowner,

no big deal. I've done this myself as have many others. Easy to get wrapped up in the post without paying attention to the 'other' info displayed. Guys will respond to a trans thread assuming it's for a manual trans when the OP has an automatic, or post on a particular year when the OP has something different. Happens all the time. Welcome to the forum
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