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Thread: 2013 JK No Heat issues / Coolant Issues

  1. #1
    Fresh Catch matt87951's Avatar
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    2013 JK No Heat issues / Coolant Issues

    I've done a lot of research, and I suppose at this point, am looking for confirmation on what I've found. Onto my post...

    Problem: Yesterday, as far as I know, out of the blue I no longer have heat. To be fair, I really can't remember the last time I used heat. It's been a while, at least 2-3 months. However, the last time I needed heat, it worked fine. Currently, the Jeep just blows cold air. Not warm or hot, just cold air.

    Troubleshooting: I started with quite a bit of research, and feel like the most logical reason is the drivers side blend door, but we'll see what the troubleshooting thus far will uncover.

    • Checked Coolant Level
    • Checked Oil Level and condition
    • Jeep warms up properly, and stays at the correct temperature while driving / sitting in traffic
    • Passenger side blend actuator works fine - Cold air blows floor, vent, defrost, etc. depending on how I set the controls
    • Drivers side blend door actuator does not seem to do anything - It 'stays' in the middle no matter where I put the temp on HVAC - note: My Jeep does have automatic temperature control, but I have made sure in my tests that neither the blower nor the blend was set to automatic
    • I pulled the coolant reservoir and found 'stuff' at the bottom - Photo below
    • Drained coolant reservoir and tried my best to separate the good coolant and whatever crap was at the bottom - Photo below
    • Cleaned out the coolant reservoir. Have not put back together - waiting on getting some distilled water


    Photo of the coolant reservoir:
    Coolant_Res_zpsnlfeytoq.jpg

    Picture of what was in the reservoir (Jar on the left is a mix of some coolant plus whatever 'crap' was at the bottom, one of the right is doing my best to only get coolant, but some of the crap fell in there as well):
    Coolant_zpsmboz37f8.jpg

    Another picture, right after pouring them into jars:
    Coolant_2_zpstjx4svwj.jpg

    Background on Jeep: My 2013 Jeep Wrangler Unlimited Rubicon 10th Anniversary is a one-owner, it has every option expect it has a manual transmission - so no remote start. It has only been serviced at Jeep dealerships due to getting a maintenance package on the Jeep free with purchase. I've never added coolant or anything to the system. If it was ever low (not to my knowledge), it would have been the dealer adding coolant and/or water. My Jeep has 21k miles on it, and is out of the 3-year / 36k mile warranty due to time of course.

    I have never had issues with heat in the past. It's always worked, and been boarder-line melt your skin off hot. I don't really remember any particular time when it's not gotten that hot if I wanted it that hot, except maybe when it was ridiculously cold (Minus 10-20 degrees, with windchill of -30 or more). I have not had any other issues with the Jeep, outside the oil pressure sensor, which failed earlier this year (Out of pocket repair).

    Next Steps: I am kind of torn on what is going on. I feel the issue very well could be casting sand in the coolant, which plugged the heater core. Though I feel this would have happened sooner than 4-years into ownership if this was the case, and I don't think this problem 'normally' starts more or less overnight. It usually has symptoms of heat on only one side, or only Luke-warm heat. The other item that is odd to me, is the drivers side blend door, it doesn't move. My understanding this one should control hot/cold. It doesn't do anything, no matter what I do with the temperature switch (Currently its sitting right in the middle of the arm. The third item is that it could be the HVAC control itself.

    So, questions to the experts, what is my issue:

    1. Casting Sand and/or clogged Heater Core
    2. Drivers-side Blend Actuator
    3. HVAC Controller
    4. Other?


    Either way, whatever is wrong - my coolant needs help. If no one has a good idea whats in my coolant, I will likely send it out to Blackstone Labs, and see what they are able to determine is going on with my coolant. I can't imagine having an inch or two of thick 'stuff' at the bottom of the reservoir is normal, or healthy.

    Thanks in advanced!

  2. #2
    Administrator wayoflife's Avatar
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    Haven't read your whole post yet but just looking at the pics, I think this thread might be helpful or at least, to help you understand what might have happened.

    https://wayalife.com/showthread.php?...ve-Your-Engine!

  3. #3
    Fresh Catch matt87951's Avatar
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    Quote Originally Posted by wayoflife View Post
    Haven't read your whole post yet but just looking at the pics, I think this thread might be helpful or at least, to help you understand what might have happened.

    https://wayalife.com/showthread.php?...ve-Your-Engine!
    That post was my first stop, read it several times.

    Where I agree it is totally possible that the dealer could have added the wrong coolant somewhere along the way - I have no way to know. The 'stuff' at the bottom of the tank was / is a dark brown color. The coolant I pulled out, before it mixed with the brown stuff at the bottom of the reservoir was a nice purple color. The pictures don't really accurately show the color unfortunately, especially the ones after I dumped the reservoir into the jars.

  4. #4
    Been Around the Block SilverBack775's Avatar
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    IMG_7747.jpgIMG_7746.jpg just picked up a gallon at Reno Jeep for $21.06 plus tax.


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  5. #5
    Fresh Catch Alexander's Avatar
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    Looks like my coolant reservoir:
    IMG_7550.jpg
    There was something like a piece of shit:
    IMG_7553.jpg
    Of course it was casting sand in my case.

  6. #6
    Been Around the Block Clark Griswold's Avatar
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    Sounds like an actuator door issue with it possibly being stuck or not getting a signal from the temp control, also check the cabin temperature sensor on the drivers side under the steering wheel to see that the little fan is turning and not blocked. Given what you found in your overflow i would reverse flush your heater core just to be sure there isnt anything in there, i had loss of heat on the drivers side and flushed out the same looking crud out of my heater core on the same year JK as yours and my heat is like new again for the time being. Good luck, dont take it to Chrysler they will want to replace your rad, heater core and oil cooler for over $2k.

    Sent from my VS987 using WAYALIFE mobile app

  7. #7
    Old Timer JeepJeep75's Avatar
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    Were you taking pictures under my jeep too? IMG_5113.jpgmy reservoir tankIMG_5111.jpghere's some of the "shit" that's in it.
    I still have heat, it's weak, but it's there, and I have done all of my own maintenance. Up until I found the "shit" in the reservoir , it's never had coolant added. The "shit" is gritty so I'm assuming it's casting sand. When my heat stops, I'll take it in and get it fixed under my lifetime warranty. Mines a '15 too BTW.


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  8. #8
    Old Timer JeepFan's Avatar
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    If you remove the glove box, you can see the aluminum tubes going into the heater core. Check to see if the tubes get hot. If not, the core is probably plugged.

    The goo you found in the reservoir looks like a type of stop leak.

  9. #9
    Fresh Catch matt87951's Avatar
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    Quote Originally Posted by Alexander View Post
    Looks like my coolant reservoir:
    IMG_7550.jpg
    There was something like a piece of shit:
    IMG_7553.jpg
    Of course it was casting sand in my case.
    Yep, that's exactly what mine looks like. The shit just happened to fall into the jar while I was trying to separate everything.

    Quote Originally Posted by Clark Griswold View Post
    Sounds like an actuator door issue with it possibly being stuck or not getting a signal from the temp control, also check the cabin temperature sensor on the drivers side under the steering wheel to see that the little fan is turning and not blocked. Given what you found in your overflow i would reverse flush your heater core just to be sure there isnt anything in there, i had loss of heat on the drivers side and flushed out the same looking crud out of my heater core on the same year JK as yours and my heat is like new again for the time being. Good luck, dont take it to Chrysler they will want to replace your rad, heater core and oil cooler for over $2k.

    Sent from my VS987 using WAYALIFE mobile app
    The actuator door did fix the no heat at all issue. However, now after spending all day flushing the cooling system, I now have intermittent warm / hot heat on the drivers side. The passenger side blow scorching hot all the time (same as the driver side, before I started the flush and fill process).

    I think I have to take a step back before I waste another $60 of coolant, and figure out how to reverse flush the heater core. I haven't found anything on YouTube yet, but I will keep looking. I assume I need to unhook the two cooling lines going into the cabin, and flush water through there, just not sure how to do so. Just stuff on the hose on one of the lines, and leave the other loose going into a bucket?

    Quote Originally Posted by JeepJeep75 View Post
    Were you taking pictures under my jeep too? IMG_5113.jpgmy reservoir tankIMG_5111.jpghere's some of the "shit" that's in it.
    I still have heat, it's weak, but it's there, and I have done all of my own maintenance. Up until I found the "shit" in the reservoir , it's never had coolant added. The "shit" is gritty so I'm assuming it's casting sand. When my heat stops, I'll take it in and get it fixed under my lifetime warranty. Mines a '15 too BTW.


    Sent from my iPhone using WAYALIFE mobile app
    Yep, it definitely seems like casting sand.

    Quote Originally Posted by JeepFan View Post
    If you remove the glove box, you can see the aluminum tubes going into the heater core. Check to see if the tubes get hot. If not, the core is probably plugged.

    The goo you found in the reservoir looks like a type of stop leak.
    Both pipes on the heater core are always burning hot. The core is definitely not completely clogged, but it's getting there it seems since I now am having issues with intermittent hot heat on the drivers side.

  10. #10
    Old Timer Andy5160's Avatar
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    Quote Originally Posted by Alexander View Post
    Looks like my coolant reservoir:
    IMG_7550.jpg
    There was something like a piece of shit:
    IMG_7553.jpg
    Of course it was casting sand in my case.
    Have you mixed coolant at some point?
    Y

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