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Old 02-13-2016, 09:47 AM
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Angry 2015 Wrangler JK - overheating-coolant issues

Need advice- I have a 2015 Wrangler JK- 14K miles, This week it started overheating. I brought it to the dealer and they stated someone mixed coolant in the radiator, NO ONE has touched the radiator other than the dealership or factory. It was serviced (oil change) 2x once from the dealer and once at meineke (which I was present and they didn't even check it). The dealer is claiming it wasn't their mistake. With that being said, now it needs a new radiator. I was reading on forums and read it can effect a lot more than the radiator, is this stupid mistake from the dealer going to ruin my jeep going forward now?? I'm very disgusted now that because of ignorance I'm going to pay for this as long as I own this vehicle.. should I be concerned about other things going wrong now that would be linked?

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Old 02-13-2016, 11:25 AM   #2
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We had our 2013 JK in for an oil change at the dealer and they topped it off with HOAT instead of OAT. After much debate, the service manager insisted that he contacted someone at Chrysler headquarters who said that our 2013 came from the factory with HOAT. As you know, the two do not mix. According to them, they switched at the factory from HOAT to OAT after December, 2012. Our 2013 was built in December, 2012. I think they were just giving me a line of BS.

If that's what they did to yours and if they topped it off with very much of the wrong type coolant then it will clog the system, not just the radiator. The problem is trying to prove the dealer did it. Look on your oil change service papers and see if it mentions whether they topped off the coolant when they did the fluid check. It probably will not say what type they used but at least it's a start.

BTW, I eventually had them do a complete flush and fill with OAT on ours at my expense, of course. I do not think the small amount of HOAT they added was enough to cause any problem.

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Old 02-13-2016, 06:56 PM   #3
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Once it's completely flushed it should be fine. I would also have the thermostat replaced. Hopefully your water pump wasn't also affected. HOAT and OAT obviously aren't compatible, but I'm actually surprised that a few ounce top off would cause that type of problem. Maybe it was a lot more than a few ounces. Dealers are supposed to know to use the correct coolant, especially in a 15 where there's no doubt that it takes OAT. I know you mentioned that you're sure Meineke didn't add coolant but for me they would be the usual suspect unless you were standing right there when they did the oil change. Either way, a complete and thorough flush and radiator replacement should take care of it. Again, I would also replace the thermostat. Good luck.
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Old 02-14-2016, 11:51 AM   #4
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I agree with KIK. Who knows how and when your coolant was mixed and I wouldn't expect the dealership to step up to the plate. Flush, Flush, and then Flush. Replace the thermostat and you will be fine. I don't believe you will have any long term affects here. Take things into your own hands.

BTW I cant understand why they want to replace your radiator? Take your jeep outa there and don't go back!!!!!!!! They should have recommended a strong flush and replace before they wanted to replace the radiator.
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Old 02-14-2016, 01:26 PM   #5
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Probably a stupid question but how they could tell both HOAT and OAT were both in the radiator?
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Old 02-14-2016, 02:12 PM   #6
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Probably a stupid question but how they could tell both HOAT and OAT were both in the radiator?
If enough of both are mixed together they start to gel. Maybe what they saw in the radiator looked like it was starting to do so.
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Old 02-14-2016, 02:44 PM   #7
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Probably a stupid question but how they could tell both HOAT and OAT were both in the radiator?
It's not a stupid question. The system might have looked something like this:https://www.google.com/search?q=hoat...QoZex_k7o6M%3A
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Old 02-14-2016, 04:03 PM   #8
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Thanks, makes sense now. I've done a bit of reading in the last hour and never knew there were so many types! With 4 mechanics in the family (I'm not one), I just rely on them!
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Old 02-14-2016, 04:17 PM   #9
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I did this in my WJ and after several driveway flushes, the system is fine.
I was changing the thermostat and water pump anyway, and they were pretty clean.
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Old 02-14-2016, 05:34 PM   #10
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I miss the days when you could just throw peak 50/50 into anything. Now I have to get my f150 coolant from ford for the low price of 30 a gallon. Glad I read this one. Thanks for the heads up and hope you get it squared.
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Old 02-15-2016, 07:04 AM
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Ok so here is the "story" Im getting. When they drained the system the antifreeze started as purple then changed to red. According to everything I read online and heard from yet another dealership the 2015 is supposed to be OAT and it should be red. Also i have a jeep compass and a jeep gr cherokee both 2015 which both have red..Now taking that into effect, just say 4000 miles ago (my last oil change) meinike topped off with the wrong stuff. Which I know for a fact they never opened the radiator at all. After driving 4000 miles would they not have mixed into one color? Would it really be separated into 2 colors after 2 months and 4k miles? Heres my thought.. i brought it in for lightly overheating, smell ,smoke but not pouring out. My thought is they put the wrong stuff in to fill to check it. And the overheating was a simple small leak. But they combined it when checking. My concern now is this. They are replacing the radiator and flushing and nothing else. In 6 months i put on 14k miles which means i will be out of warranty before you know it. Keep it or dump it? Very disgusted at the ignorance. And the service manager is in law family so im getting the family screw job. They are definitely hiding something. Another question I cant seem to find an answer to.. if the fluids are mixed how quick does it gel up?? And start causing damage?
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Old 02-15-2016, 10:53 AM   #12
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There's good info. here regarding HOAT/OAT color. https://www.wranglerforum.com/f274/is...t-1050513.html OAT can look red in the system after some mileage. Topping off the system would be done through the expansion tank if it's just serviced at a dealer or shop if they check it when you get an oil change, for example. It sounds like the dealer is taking responsibility for the problem. Since they're flushing the system and replacing the radiator, I would also insist that they replace the thermostat. Since everything else is getting flushed/drained, it takes only a few minutes to replace the thermostat at the same time and it's a minor expense when you add it to replacing a radiator.
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Old 02-16-2016, 11:07 AM   #13
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Found this interesting article in another forum:
ATTENTION: Know Your Jeep JK Wrangler Coolants and Save Your Engine!!

IMPORTANT - you CANNOT always go by color alone!!!
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Old 02-16-2016, 11:16 AM   #14
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If the system has to be topped off @14k you have a bigger issue to deal with. Adding a small splash of the different coolant isn't going to make a gelling issue, at least quickly.
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Old 02-16-2016, 12:10 PM   #15
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Going to put this under the hood (2.5" x 2.5")

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Old 02-16-2016, 12:47 PM   #16
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Going to put this under the hood (2.5" x 2.5")

Not a bad idea. Is this a sticker you did up yourself or did you find it somewhere. I would get one of these. In the mean time I drilled a hole in the tab on the overflow lid and zip tied it closed. If anyone dicks around with it at least I know.
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Old 02-16-2016, 02:09 PM   #17
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Did a Google search for custom-made stickers.
Found this: https://www.stickeryou.com/

I created this (online) on permanent white vinyl paper.
Sheet of 12 of these for $20.
(Maybe I'll order and send to 11 users...)

Didn't submit yet, as I wanted my graphic artist sister to get me something real nice based off this idea.
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Old 04-28-2017, 01:59 PM   #18
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KKebble did you ever get your running hot issue fixed? My 2015 also runs hot 230-231 I've had it at the dealer they say everything is normal. I have traced it to the fan not coming on until the temp is at 230. Even when I turn the AC on the fan does not come on, probably why I don't get cold air until the engine hits 230. I asked the dealer to reprogram the temp setting, they said they can't because according to them this is normal. I guess I'm going to have to find another dealer. 230 is to hot. My 06 LJR runs at 185 to 190.
I noticed that if you look up a thermostat for the 3.6 they are molded into the housing so you have to replace everything and it's set at the factory at 203 degrees.
CTarna did you ever get any stickers made up? I also zip tied the lid on my coolant recovery tank. The dealer is the only one that has serviced the Jeep but that was a good idea. My Jeep just turned 11,000 miles.
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