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Unread 05-29-2013, 01:49 PM   #1
GatorsUF
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Remove heater core?

I was curious if there is any good info on how to remove the heater core from my YJ. I don't use it and it currently doesn't work. I'd like to have the extra room under my dash.

Is there an issue with removing it since it seems I would have a huge open hole under my dash from the hood vent.

I live in FL I don't need heat...I need AC but that is a whole other issue

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Unread 05-29-2013, 02:12 PM   #2
Reno72
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You would have a hole above where the air comes in, a hole on the passenger side where the blower motor is, and a few holes where the studs go through the fire wall. Biggest problem would seem to be what to do with the air coming from the cowl vent.
You can do a search on removal, it's pretty easy but takes some wiggling to pull the whole housing out. If I remember it's just 4 nuts to remove on the firewall, three cables going to housing flaps, and the intake and outgoing water hoses, while I was fixing mine I just turned the water line going into the firewall and connected it where the water coming out of the heater core connects back to the rad.
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Unread 05-29-2013, 02:28 PM   #3
Rproject
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Quote:
Originally Posted by Reno72 View Post
while I was fixing mine I just turned the water line going into the firewall and connected it where the water coming out of the heater core connects back to the rad.
Yup. Putting a fitting between the two hoses will create a loop and bypass the heater core. As for removal, I had to pull my duct work to change the heater core. What a PITA. 4 studs through the firewall for the blower motor, two hoses for the heater core plus a couple other fasteners for the duct work. One of the fasteners is on the driver's side of the valve cover. There are several good writeups on how to change the heater core. You can follow them and just not reverse the process. For the fresh air duct, it's up so high that it likely won't be in the way of anything after you pull the duct and you can probably just leave it behind.
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Unread 05-29-2013, 02:47 PM   #4
Luuca
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Quote:
Originally Posted by GatorsUF View Post
I was curious if there is any good info on how to remove the heater core from my YJ. I don't use it and it currently doesn't work. I'd like to have the extra room under my dash.

Is there an issue with removing it since it seems I would have a huge open hole under my dash from the hood vent.

I live in FL I don't need heat...I need AC but that is a whole other issue
I rebuilt my heater box, new core etc. I used this thread from the CJ forums as a guide. It's chock full of great information. Also search heater core in the YJ forums for more threads.

http://www.jeepforum.com/forum/f8/cj...-heavy-975999/
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Unread 05-30-2013, 11:51 AM   #5
phottomatt
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I am dreading this as my blower is bad but required for the PA safety inspection (must have a working defroster). Thanks for the info.
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Unread 05-30-2013, 11:54 AM   #6
Luuca
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Originally Posted by phottomatt View Post
I am dreading this as my blower is bad but required for the PA safety inspection (must have a working defroster). Thanks for the info.
You know what, it's not that bad really. A few bolts and some wrestling with it and you'll be OK. That thread I linked helped me a lot.
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Unread 05-30-2013, 01:55 PM   #7
Reno72
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It's sort of a PITA but only because it takes patience and a lot of wiggling. I have A/C and all the write-ups said I had to discharge it, I didn't, just unbolted it, moved it to the left, and pulled the heater housing. Getting it out was harder than getting it back in, only because it was hard to tell where and what it was hanging up on.
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Unread 05-30-2013, 02:16 PM   #8
dcocch
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http://www.jeepforum.com/forum/f12/heater-core-219329/

I just did mine on Tuesday. I posted a pic on page 4 of where the bolts were on my 89, they were in different spots than the OP's pics.
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Unread 06-01-2013, 04:26 PM   #9
phottomatt
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Yeah after I saw what all needs to come off from the cj link I went out and looked it over good with a much better understanding of what needs to be done and it doesn't look nearly as bad as I thought, thanks to the wisdom and Generosity's of the people from this forum. Chilton manual doesn't even have the right procedure.
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Unread 06-01-2013, 09:37 PM   #10
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Important note... blaster and a light hand are needed when removing the nuts on the other side of the firewall. Just busted 3 of 4 off today when stripping my old tub (with a 1/4 drive ratchet)... the 4th was already off when I got to it or it might have sufferred the same fate... on the bright side the broken studs aren't too hard to rip out and replace with tacked bolts and washers.
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Unread 06-02-2013, 08:39 AM   #11
phottomatt
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Quote:
Originally Posted by Shadownwpa View Post
Important note... blaster and a light hand are needed when removing the nuts on the other side of the firewall. Just busted 3 of 4 off today when stripping my old tub (with a 1/4 drive ratchet)... the 4th was already off when I got to it or it might have sufferred the same fate... on the bright side the broken studs aren't too hard to rip out and replace with tacked bolts and washers.
Thanks for the heads up.
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