1986 CJ7 Heater Core Replacement - JeepForum.com
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post #1 of 22 Old 04-02-2008, 07:33 AM Thread Starter
dhood
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1986 CJ7 Heater Core Replacement

Hey Guys,

I am replacing my heater core this weekend in my 86 CJ7 4.2 and was wondering if I should anticipate any surprises? It looks pretty cut and dry but you never know. You know any hidden nuts, screws, clips, or look out when you do this becasue this will happen, stuff like that. Any tips or tricks would be appreciated. Thanks

Dave

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post #2 of 22 Old 04-02-2008, 08:02 AM
hdroadkingc
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Cut and dry except the nut behind the valve cover can be a pain.
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post #3 of 22 Old 04-02-2008, 08:48 AM Thread Starter
dhood
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Didn't know about the nut behind the valve cover. That's what I'm talking about. I appreciate the help.
Dave
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post #4 of 22 Old 04-02-2008, 12:23 PM
Mike Romain
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While you are in there, I recommend an upgrade to a big GM heater blower. They fit right into the heater box and squirrel cage and out out more on low than the stock one does on high. You have to cut the hole in the firewall a little bigger.

It's soo nice to have 'all' my windows defrost at -20 or colde, let alone not needing gloves or a ski suit...

Here is one link on doing it: http://jeep.off-road.com/jeep/articl....jsp?id=261421

Mike
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post #5 of 22 Old 04-02-2008, 12:44 PM Thread Starter
dhood
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thanks I was already considering that while I was researching the heater core.
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post #6 of 22 Old 04-03-2008, 08:26 AM
heath84CJ7
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Make sure you get the heater blower motor for a Blazer that is a short shaft. I got one from Napa that was to long. Went back and got the other and it was fine. I believe the Napa Part number was 655-1039 if memory seves me correct.
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post #7 of 22 Old 04-03-2008, 08:56 AM
Mike Romain
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Quote:
Originally Posted by heath84CJ7 View Post
Make sure you get the heater blower motor for a Blazer that is a short shaft. I got one from Napa that was to long. Went back and got the other and it was fine. I believe the Napa Part number was 655-1039 if memory seves me correct.
The last ones I bought were the cheaper one of the two. The 'premium' one had the longer shaft. I am up in Canada though.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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post #8 of 22 Old 12-12-2011, 11:03 PM
brad607e13
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Just replaced heater core in 84 CJ7 4.2L Not to bad a job. 4 nuts to remove from engine compartment side of firewall, 1 behind valve cover, 1 right and below battery, 1 under battery close to drain tube, 1 left and below battery. Unplug electrical wire close to drain tube. Inside the cab, unhook 2 cable controls in the center area along with defrost duct directly above them. Entire system will come off of firewall. Remove back plate and replace core. Reverse steps to reinstall. Hope this helps.
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post #9 of 22 Old 12-13-2011, 05:20 AM
KJNewbs
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On the long shaft vs short shaft side of things, what happens/doesn't work with the long shaft?

I did this a couple of weeks ago, and when I was done I noticed that the cylinder that attaches to the motor (to move the air) rubbed on the front plastic part of my enclosure after I put it all together.

That didn't seem to be because of the shaft, but more because of the added bump out at the shaft base, but am I wrong?

Long story short, I'm wondering if my problem is caused by having the "long shaft" one.

As far as the OP, the directions offered above are pretty spot on. While apart, check all of your foam seals and what not. When I did mine, I replaced all of it to achieve tighter seals around the flaps and what not.

-KJ Newbs / Jersey

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post #10 of 22 Old 12-13-2011, 07:47 AM
CJ Chet
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If you go to Autozone, they've already done the work for you. Just tell them you want a blower motor for an '86 CJ7 and you'll get the proper upgrade motor (pm102).

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post #11 of 22 Old 12-13-2011, 08:33 AM
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Do all the upgrades require cutting a larger motor hole?

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post #12 of 22 Old 12-13-2011, 11:16 AM
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Yes, if you want to use the tried and true Chevy Blazer motor. The larger motor gives you more rpm then the inadequate OEM fan motor ever would. Low setting on the Blazer type motor is close to the High setting on the OEM fan motor.

.
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post #13 of 22 Old 12-13-2011, 01:00 PM
DoubleDown
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Someone on this forum posted a very pic heavy heater box rebuild, but I can't find it in the searches. Could someone post a link ?

Thanks. I need to do mine as well.
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post #14 of 22 Old 12-13-2011, 01:02 PM
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post #15 of 22 Old 12-13-2011, 01:46 PM
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Thanx. Very Helpful.
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