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Unread 07-02-2013, 02:48 PM   #1
agear
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1984 CJ7 
 
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4 heater cores in 12 years

I've had to replace my heater core several times before. Is there anyway to make the heater core stronger and less likely to leak ? Any idea what's making it leak ? What keeps happening ? Is it a mounting issue ? Do I need some more padding between the firewall and heater box ?


I have an 84 jeep cj7 4.2L

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1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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Unread 07-02-2013, 03:04 PM   #2
gmakra
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Are you running well water?
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Unread 07-02-2013, 03:12 PM   #3
Renegade82
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I'm guessing corrosion is your issues. Flush your whole system before you replace it, then use distilled water and a quality antifreeze.
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Unread 07-02-2013, 03:32 PM   #4
LumpyGrits
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Where were they made? China??
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Unread 07-02-2013, 04:11 PM   #5
Redmanchew
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AG,
I have seen BIG differences in the ones I purchased at AZ or Advance compared to the last one I bought at Federated. I don't know if you guys have them down there but if it is the solder that is cracking where the tubes meet the bundle the look them up (or let me know and i'll send you one from up here. I had 1 from AZ crack just working it through the firewall the first time....
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Unread 07-02-2013, 04:18 PM   #6
only in a jeep cj
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Yes, that is too many too soon. I average 1 every 12 years. What conditions have the last 4 failed? Leaking at the fins, or at the joints?
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Unread 07-02-2013, 04:22 PM   #7
LumpyGrits
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My OEM core started to leak and I just resoldered it. Still going strong after 28+ yrs.
LG
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Unread 07-02-2013, 04:34 PM   #8
agear
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I don't know if I'm running well water-its the water from my hose and coolant.
Its a new radiator and recent remanufactured engine so I'm not worried about flushing. But I use prestone and will use distilled water.
This address on the instructions, and warranty information is pro source heater cores in Texas and is a ready-aire from advance auto.
I don't know where this one is leaking yet because I haven't got it out yet but in the past and this time as well the issue leakage. In the past leakage from the fins I think. I will let you know later, where this one is leaking.
Thanks, check back later
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1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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Unread 07-02-2013, 07:00 PM   #9
agear
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Okay, I got it out. But sorry guys, I just sorta yanked the b@#$% from under the dash and may have damaged the heater core more in the process so you may not be able to tell what was wrong in the first place now. But you can see the tell tale green stuff on the fins. Is it me or are these things extremely fragile how they're soldered to that bracket and the tubes to heater core ? I did not remove the dash to do this. For once I want to proceed very slowly and avoid damaging this on installation. So, also, do you have any tips for that too ? Well I tried to post pictures but no dice using photobucket.
So there was green stuff on the fins by one of the tubes

There was rust around where 1 of the tubes is soldered to the heater core

There was green stuff where the bracket was soldered on and that bracket broke off

And there was green stuff on the fins on the side
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1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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Unread 07-02-2013, 07:16 PM   #10
MoC
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Green stuff is corrosion from water. My bet would be just bad luck from the cheap heater cores they make for our CJ's.
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Unread 07-02-2013, 07:22 PM   #11
LumpyGrits
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Some coolant is green in color. Makes it easy to find in 'blacklight'.
LG
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Unread 07-02-2013, 07:33 PM   #12
agear
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Yeah, I think the green stuff was the corrosion from the water on the copper. Waiting for the battery to charge for my drill. Because the heater core tubes and screw holes aren't lining up with the heater box holes.........
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1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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Unread 07-02-2013, 09:14 PM   #13
agear
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I didn't want to work in the jeep at night and tweak something that I can't see. So that's all for the night. I'll probably grind the holes for the tubes in the firewall, bigger , seeing how I had to do that to get the tubes to line up with heater box holes. I might have needed to do that but overlooked on previous heater core installs. I'll let you know how it's going tomorrow. I'm off for the week.
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1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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Unread 07-03-2013, 06:19 AM   #14
RWise
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I agree that quality is going down hill, but if they be working for others,,,
My thought is electrolisis, in this case an electrical current flowing through the heater core into the coolant and off to find a ground in the engine block (or radiator). Yep that is what I am saying, a bad ground!
Good luck!
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Unread 07-03-2013, 06:46 AM   #15
wellmax
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my dodge diesel forum says to use distilled water in cooling system on the truck. otherwise it can cost you big money down the road with that engine.
and also special coolant.


so I always use distilled water in the cooling system of all my vehicles, jeep included.

I bought my cj7 1984 replacement heater core from Quadratec,

it was more money than some have stated in the above responses, from the local parts houses.

but the heater core appeared to be well made and I handled it like a new baby, as I did not want to do this job again.

so far, and that was many years ago, no leaks,

I rarely use the heater anyway, if it ever went out again I would just connect the heater hoses together under the hood and let the coolant circulate without going to the heater.

was not worth the trip for me to repair it.

but then again I enjoy riding and driving my jeep, not a die hard mechanic who had rather work on it, than drive it.
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