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Old 12-21-2012, 10:27 PM   #1
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heater core

Brought my 12jk to the stealership almost 2 months ago. Told the service manager that it was heater core and explained to him what ive been reading on here and told him i am having same issues. He said that he hasnt heard of this issue and basically laughed at me. Seven hours later he calls and tells me its tbe heater core. Actually I had to call him My issue is that I live in Connecticut its getting cold here. I go to work early in the morning and im getting tired of freezing my balls off in the morning and we've actually had a mild winter so far. Ive called the dealership.twice since my last visit and they have yet to tell me when the part will be in. They cant even give me a ballpark figure on when this part will arrive. Im ready to ask them to take a heater core from a wrangler off the lot. This is ridicolous. I have an 8 month old jeep with 8000 miles and I cant get any heat. Absolute crap.

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Old 12-22-2012, 01:07 AM   #2
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Not to mention it is a dangerous situation. Mine is an 08 and I noticed this year my left side vents were cooler than the right. Evidently you are hip to all those post. I took temps of my vents and found left to right, 90, 120, 130 and 145 on a 35° day. I am out of warranty. I purchased a core and had planned to replace it myself duing Thanksgiving but first I gave it an effort to backflush it. So I took the two hoses off and backflushed using a water hose and catching the output with a real nice strainer my wife has and what i found looked exactly like calcium you find in a faucet from hard water. I was expecting sand or some kind of gunk others have reported. I put everything back together and I had heat. Like it was last winter. Burn your hand if you leave it there heat. I took temps again and wrote them down but not sure where that note is right now. On memory somewhere around left to right, 145, 155, 160 and 170.

I have to wonder how would a cooling system get so much calcium in it. It's a closed system.

A little history: I got my jeep in May 2011 with 38000 on it. The first month I had it the radiator has a very small leak in it and the dealer replaced it under warranty. I got to thinking maybe whoever had it before me had a leak for a while and kept putting in fresh water. maybe well water; who knows.

My plan was to replace all the coolant. I went to the dealer and got the Mopar antifreeze at nearly $50 for two gallons. I got some CLP or whatever that is called and I got some Prestone Flush. I also noticed the left vent started cooling off so I knew it was clogging up again. Then I started reading where you are not supposed to use CLR in a radiator. (it is CLR "calcium lime rust". CLP is what I use on my guns that I protect myself and my family with, "clean lubricate and protect") But then I read where several people have used it on a radiator. I flushed the core and got some more calcium out and then I rinsed the whole system out; blew everything out best I could and poured clr into the core and let it sit a little while. Flushed everyting out with clean water then ran the Prestone Flush per directions. Back flushed the core several more times and not getting anything out at all. I put everything back together and put the new antifreeze back in. Wow, now I have temps left to right something like 160, 170, 175 180. That was a month ago and I notice the temps are starting to cool a little bit on the left side. Not too bad but a noticable difference. I plan to flush the core again this next week trying my best to save the expensive coolant.

I still have my new core I purchased. I decided with all that I read guys haveing trouble with thiers I would hang on to it. It did have to get ordered and took a few days to come in. It was about $100. These heater core problems are bad. I didn't even mention my defrost vents. The drivers side was blowing cold air. Not good in a freezing rain situation.

I guess my point in telling all this is you might want to try flushing the system. You're under warranty so tell the dealer to do it. I would want to know what's in there. I never did hear absolutely if all the problems was sand like most people thought it was. If it is it has to be all thru the system, I would think. I am nearly positive my problem was or is calcium and I believe it will eventually get cleared out. I ahve pictures of what I got out and I think anyone that has seen calcium from a water line would agree that is what it is. Anyway, good luck.

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Old 12-22-2012, 02:14 AM   #3
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Has anyone even thought about trying a different heater core - like from a Dodge Ram or something? I haven't looked into all the details but I was just thinking there might be one that is close to spec but better design already out there.

Or on a more interesting idea, does the JK share a heater core with another vehicle? Does that vehicle also have the same heater core issues too?
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Old 12-22-2012, 11:05 PM   #4
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The dealer did flush mine but it didnt make any difference
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Old 12-22-2012, 11:21 PM   #5
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From what I have read on here and elsewhere on the internet, flushing seems to be hit or miss. IMO install a filter. You can make one.


1 in. Hose Washers with Screen, 2-Pack-80070 at The Home Depot

5/8 in. Male Hose-End Mender-27943 at The Home Depot

5/8 in. Female Hose Mender-27944 at The Home Depot
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Old 12-22-2012, 11:55 PM   #6
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Quote:
Originally Posted by SilverSport View Post
From what I have read on here and elsewhere on the internet, flushing seems to be hit or miss. IMO install a filter. You can make one.


1 in. Hose Washers with Screen, 2-Pack-80070 at The Home Depot

5/8 in. Male Hose-End Mender-27943 at The Home Depot

5/8 in. Female Hose Mender-27944 at The Home Depot
That sure beats the heck out of using the heater core as the filter.
Thanks for the links.
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Old 12-23-2012, 09:21 AM   #7
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Old 01-02-2013, 02:45 PM   #8
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+1 on the heater core.

Just took mine in - "knowing" that's what I was facing based on what I read here.

Dealer called a few hours after they opened in the morning - needs a heater core. Of course, they no gots :P Oh... and will take 'em 2 days to fix.

Was 11 degrees this morning... at least the heated seats offer some salvation.

So here's a question - not sure if I read right, but was this caused by gunk left in from the engine block casting or in the heater core parts? If the coolant passages have enough crap in em to block the heater core, what are the oil passages like?!
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Old 01-02-2013, 03:16 PM   #9
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Dunno if this is higher than normal or not. 41 degree day.
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Old 01-02-2013, 10:51 PM   #10
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Dunno if this is higher than normal or not. 41 degree day.
216°F
Are you sure that meter is correct? If that is accurate it seems jeep would be required to put warning stickers all over the dash. The hottest I've seen mine was about 180° and that was burning hot.
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Old 01-02-2013, 11:10 PM   #11
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Lightbulb

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Silver, I put a set of those hose menders in my heater hose and it works great. Last weekend I took a 3-hour drive to go wheeling and almost there my heat suddenly got cool. Pulled over for fuel and took the fittings apart and there was the clog. Put it back together and instant heat. After wheeling most of the day along about that gas station I stopped at earlier I noticed the heat cooling again. Same thing, clogged with what looks just like calcium/lime deposits.

The other day I saw a picture someone posted of their clogged washer strainer and that material looked like a snotty slime substance. I would have to say it was a different material than what I'm dealing with.

I just wonder if there is a bigger filter that could be installed in the hose. Something the size of an oil filter. It doesn't take much to clog that little strainer. In both times mine clogged Saturday, it did it suddenly. Both times I could tell something happened.
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Old 01-02-2013, 11:26 PM   #12
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Quote:
Originally Posted by Yella View Post
Silver, I put a set of those hose menders in my heater hose and it works great. Last weekend I took a 3-hour drive to go wheeling and almost there my heat suddenly got cool. Pulled over for fuel and took the fittings apart and there was the clog. Put it back together and instant heat. After wheeling most of the day along about that gas station I stopped at earlier I noticed the heat cooling again. Same thing, clogged with what looks just like calcium/lime deposits.

The other day I saw a picture someone posted of their clogged washer strainer and that material looked like a snotty slime substance. I would have to say it was a different material than what I'm dealing with.

I just wonder if there is a bigger filter that could be installed in the hose. Something the size of an oil filter. It doesn't take much to clog that little strainer. In both times mine clogged Saturday, it did it suddenly. Both times I could tell something happened.
Glad it seems to be working.

I installed the hose menders and strainer just the other day. I haven't had the "low heat on driver's side/heater core issue" but I figured maybe the filter setup is cheap insurance.
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Old 01-03-2013, 02:49 AM   #13
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I just wonder if there is a bigger filter that could be installed in the hose. Something the size of an oil filter. It doesn't take much to clog that little strainer. In both times mine clogged Saturday, it did it suddenly. Both times I could tell something happened.
Maybe something on here would work- McMaster-Carr

May have to do some creative routing of the hoses though.
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Old 01-03-2013, 06:39 AM   #14
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Darn, Just what is going on with these cooling and heating systems? I try and read these threads with a grain of salt, but it does make you wonder...

With all these high tech fluids they put in these vehicles now, you would think we would never have a problem.

I like the thought of the hose menders and filters. Would make it easy to back flush or for that matter bypass if need be. As a Parts Pro, I try and use the ideas I glean from forum like this to help my customers
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Old 01-03-2013, 06:56 AM   #15
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Originally Posted by j_pappy View Post
Brought my 12jk to the stealership almost 2 months ago. Told the service manager that it was heater core and explained to him what ive been reading on here and told him i am having same issues. He said that he hasnt heard of this issue and basically laughed at me. Seven hours later he calls and tells me its tbe heater core. Actually I had to call him My issue is that I live in Connecticut its getting cold here. I go to work early in the morning and im getting tired of freezing my balls off in the morning and we've actually had a mild winter so far. Ive called the dealership.twice since my last visit and they have yet to tell me when the part will be in. They cant even give me a ballpark figure on when this part will arrive. Im ready to ask them to take a heater core from a wrangler off the lot. This is ridicolous. I have an 8 month old jeep with 8000 miles and I cant get any heat. Absolute crap.
Did I read this correctly that you have been waiting two months to get a heater core? Your dealer is pulling your chain, it really shouldn't take more than a week to get the part unless there is a national backorder which then usually means two weeks. Go to a different dealer.

Dealerships love to be jerks sometimes as they know they have you by the short hairs. You need to bypass them in these instances and use a different dealer. The manufacturer is nearly powerless over the operations of the dealership as they are privately owned franchises and state laws protect them at all costs.
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Old 01-03-2013, 07:22 AM   #16
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subscribed. does this only affect early jks or is this a recurring issue
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Old 01-03-2013, 07:37 AM   #17
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As I understand it. Several possible issues encompassing all model years of the JK.
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Old 01-03-2013, 09:03 AM   #18
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I was in the dealership yesterday for my '12 JK and a guy there was having his heater core replaced in his '12. They said they've have it back to him by tomorrow I believe.
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Old 01-03-2013, 11:39 AM   #19
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I did some research and found that Baldwin, Donaldson, and Wix make coolant filters for OTR trucks. Basically consists of a spin on filter, and filter base. With a little creativity something like this could possibly be mounted on the side of the battery box.
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Old 04-23-2013, 11:44 PM   #20
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After hearing about numerous members experiencing issues with a lack of heat due to blocked heater cores, I tried to take a proactive approach. I installed an inline filter using fittings for a water hose and a screen washer. This was around New Years Day 2013.

The last few days, my Jeep has seemed colder than normal even with the temp knob on max and the blower speed turned up. This morning when I started my Jeep I heard the infamous gurgling behind the dash. With the engine at operating temp, as soon as I moved the temp knob back from max just one or two notches, the air coming out of the vents would go to lukewarm.

Pulled the screen out tonight and look what I found:
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Old 04-24-2013, 07:17 AM   #21
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awesome....
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Old 04-25-2013, 09:22 PM   #22
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Pulled the screen out tonight and look what I found:
I installed one of those brass y-strainers with a 60 mesh screen and have not had an issue at all. The strainer is plenty big enough to catch a lot of crap in it. Real soon I will take the screen out and see what I find. I got mine from McMaster that someone actually posted a link to up above.

Actually the first screen I got was the size 40 mesh. It allowed the crap to go thru to the core and cool things down still. No trouble since putting in the 60 mesh.

Silver, did you happen to set that crap you collected aside and let it dry? Did you examine the crap to determine what it might be? The crap I collected turned into mini cat litter crystals that could break down to dust easily with a toothpick. I have pictures somewhere.

Sorry about the overuse of the term crap. I don't know what else to call it.

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