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PostPosted: Sat Jan 12, 2013 3:14 pm 
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Location: Rocky Mount, NC
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Hey guys, so I'm planning on replacing my busted heater core soon, so I went out today to dig under the dash to get a feel for things and I'm a bit puzzled to say the least. :dontknow:

I've done a bunch of searching here and on other pages, and found a lot of rather inspecific "take the glovebox out, remove the black thing and there's the core!" posts, but nothing step-by-step or a detailed write-up. After removing my glovebox and hush panel and looking around for about 30 minutes, I still can't relate what I'm seeing to the pictures I've come across showing what needs to come off or how it comes off.

Does anyone know of a step-by-step, or at least really detailed, write-up on how to get to, remove, and replace the heater core?

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PostPosted: Sat Jan 12, 2013 4:28 pm 
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The instructions, if there are any, will depend on you having a manual A/C - heater or ECC (Electronic Climate Control). Which do you have? - BC

by the way, before I forget, ground your new heater core just in case there is any stray electrical voltage any where in the car. That can cause a premature failure of your core. - BC

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PostPosted: Sun Jan 13, 2013 9:57 pm 
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I have ECC. I've read also about grounding the core, I'm assuming I can just run a bit of insulated wire from somewhere on the core to a screw on the chassis?

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PostPosted: Sun Jan 13, 2013 11:13 pm 
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Need For Steve wrote:
I have ECC. I've read also about grounding the core, I'm assuming I can just run a bit of insulated wire from somewhere on the core to a screw on the chassis?


Correct. That is what my son did for me. I am posting two threads that should be of help. I can tell you that my son and the dealer both removed the dash to replace the heater core in my old Bonneville. IIRC willwren replaced his without having to do so. He laid the driver and passenger seat backs all the way down flat, layed down flat on his back with his head on the front passenger floorboard, looking up under the dash. He had to do everything by feel.

Here are the two posts that I hope give you the information you are looking for:

heating core replacement
viewtopic.php?f=19&t=6210&hilit=remove+heater+core

How to change Heater Core
1992/topic1516.html

Let us know how it goes. - BC

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In Memory of Brad - 1/21/1977 .. 10/23/2013 ...... Aaron - 1977 .. 2017 .....
2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... PBCF user 2321


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PostPosted: Wed Jan 16, 2013 11:52 am 
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When you get your heater core cover off, take the time to pull the airmix actuator off, take it apart, and inspect the gear for cracks. If it's cracked at all, replace the actuator now and save yourself lots of future pain. There is a little blurb on removing the heater core cover in this article too:
http://trialsnuts.com/ecc.pdf

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PostPosted: Sat Jan 19, 2013 1:18 pm 
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Thanks for those links folks, I'm gonna dive into this today and see about getting it done...

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PostPosted: Sat Jan 19, 2013 4:46 pm 
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Ok, I can't figure out for the life of me how the vac fitting comes off the box beside the core cover. I know that box has to move to give room for the heater core cover to come off but I just can't figure out how...

Anybody?

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Last edited by Need For Steve on Sat Jan 19, 2013 4:47 pm, edited 1 time in total.

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PostPosted: Sat Jan 19, 2013 7:39 pm 
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best i remember, 10mm nut in the center of the vac line assy. once nut removed, take thin flat blade screw driver and pry around entire periphery small amount at the time gradually loosening the vac line connector. you will probably destroy vac line nipples in the process (not unusual). there is a fix for that in forum.


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PostPosted: Sun Jan 20, 2013 3:55 pm 
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Got it! Thanks for the advice and links. The vac stuff wound up breaking, so I've got no dash vents for the moment, but since my ECC wont channel heat to the dash anyway it's not a big issue.

Thanks again, folks!

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