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Old 06-24-2014, 12:28 PM   #1
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Sediment in Cooling Reservoir

Took my jeep to the dealership today for some maintenance. I have a 2011 JKU with a 3.8. I am at 22k miles and still under the 3yr/36k warranty. Along with the maintenance, I asked to service mgr to look at the sediment at the bottom of the Cooling Reservoir as it seems there is about an inch of something sitting there. They called back and said I would need a flush ($159ish) and this is normal? I stated this isn't normal and I shouldn't need to flush for a while as that is what the manual states. I did have him put that this is normal on the work order for my records. My question is, has anyone else run into this? Should the dealer flush it under warranty? I would assume so as sludge (or as the dealer calls it, sediment) isn't normal.

If the dealer isn't going to budge, is calling Chrysler any help?

Sorry for the multiple questions in one thread..

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Old 06-24-2014, 03:09 PM   #2
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It should be flushed under warranty, there's a huge thread on the subject.

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Old 06-24-2014, 04:04 PM   #3
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it's casting sand out of the engine, warranty!!!!
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Old 06-24-2014, 05:11 PM   #4
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He has the 2011 3.8, do those engines have the so called casting sand issue.
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Old 06-24-2014, 05:23 PM   #5
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Here is the best pic I can get.
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Old 06-24-2014, 10:21 PM   #6
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He has the 2011 3.8, do those engines have the so called casting sand issue.
There are some 3.8's with this issue but it's not common. If it's determined that there's casting sand in the system it should be covered under 3/36.
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Old 06-24-2014, 10:55 PM   #7
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It's probably sludge build up from stop leak added to the cooling system at the factory. Read this thread and various threads linked from within it:

2013 - Discolored Coolant?

There are Chrysler Starcases about it. Should be under warranty for sure and might even need a new heater core, radiator, oil cooler, and rad cap along with the flush. How was the heat from the driver side vent back in winter?
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Old 06-24-2014, 11:58 PM   #8
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My heat was pretty good over the winter. I never measured the temp, but was definitely hot. I will call chrysler and bring up the star case.
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Old 06-25-2014, 02:00 AM   #9
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I had goop in my '12. New radiator, oil cooler, heater core and flush. So far so good. Warranty. Did it last month.
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Old 06-25-2014, 09:16 AM   #10
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I called Chrysler this morning. They agreed sludge isn't normal and called the dealership. Said to take it back and the dealership will diagnose the problem. Taking it in this afternoon.
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Old 06-25-2014, 10:19 AM   #11
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Good for Chrysler, glad they are backing their product even if some of their dealers try not to, hope it all gets resolved for you, let us know the outcome.
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Old 06-25-2014, 11:44 AM   #12
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Just got back from the dealer. They said it was sediment and is normal. This is what they will tell chrysler. Said if it was sludge, ok, but it's sediment and chrysler won't cover as it's a maintenance item. I asked if it's ok to leave it alone and they said yes. So much for the initial call with chrysler.

The service writer also said, because I didn't buy it there, it isn't certified so there isn't much they can do. Not sure what that means..

I called chrysler back and will take it to another dealer in Raleigh as I live in Cary. My next appt is after July 4th
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Old 06-25-2014, 03:14 PM   #13
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Attachment 1239618

^^^Your antifreeze is HOAT, which is used in the 2011 model.
When you look at the above picture, it is the bottle on the left. Which states 5 years, or 100,000 whichever comes first.
You can read that right on the bottle.

So if you are within that window time frame, and sediment, or sludge what ever it is called, has occurred, then it should then be covered by the warranty on the bottle.
In other words, Mopar states that their antifreeze should be good for a stated period of time, and as long as you are within that mileage/ year time frame, then the problem is their responsibility........
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Old 06-25-2014, 04:13 PM   #14
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Just got back from the dealer. They said it was sediment and is normal. This is what they will tell chrysler. Said if it was sludge, ok, but it's sediment and chrysler won't cover as it's a maintenance item. I asked if it's ok to leave it alone and they said yes. So much for the initial call with chrysler.

The service writer also said, because I didn't buy it there, it isn't certified so there isn't much they can do. Not sure what that means..

I called chrysler back and will take it to another dealer in Raleigh as I live in Cary. My next appt is after July 4th
If it was normal then my 10 would also have sediment in the expansion tank and it doesn't. It's perfectly clear, normal coolant (HOAT) and zero sediment. It has never had sediment and I will be replacing it next year at it's five year interval. You might need to find another dealer. The whole issue of not being "certified" I guess means you bought it used "as is". I don't understand why the dealer would make that an issue unless Chrysler won't cover the cost of the service. I would think it still should be covered under 3/36 unless you're past the time and/or mileage.
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Old 06-25-2014, 04:59 PM   #15
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I don't know what if more embarrassing for a car company, a radiator full of goop or claiming its normal (dealer or manufacturer).

Mind numbing.
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Old 06-25-2014, 05:12 PM   #16
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It's not normal. Maybe grab something long enough and poke it down and scoop a little sample of it then take a clear photo. If it's a light brown peanut buttery color pasty sludge, then it's the same stuff in the threads I linked earlier. Don't concede to that dealer.
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Old 06-25-2014, 05:47 PM   #17
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Not normal. Its probably like mine was and casting sand. Dont take no for an answer.
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Old 06-25-2014, 06:27 PM   #18
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mine is an 09 and it had casting sand in it, flush every thing.
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Old 06-26-2014, 02:02 AM   #19
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My 2011 had sludge/sediment/sand in it, heat only blew out passenger side with 30k on it. Dealer looked at me like I was an idiot when I mentioned how to fix it. They did end up doing heater core and radiator though. I would take to another dealer for sure and insist it is fixed properly. If it is in reservoir than it is most likely in other places as well. Stay on them and make them get it handled.
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Old 06-26-2014, 02:47 AM   #20
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Wow...a heater core having to be replaced means removing the entire dash. Well, for most cars it does. That really bites.
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Old 06-26-2014, 12:22 PM   #21
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Wow...a heater core having to be replaced means removing the entire dash. Well, for most cars it does. That really bites.
Nah its just easy screws and clips. Its by no means difficult just time consuming. I do evaporators all the time on BMWs here is an X5

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Old 06-26-2014, 02:49 PM   #22
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It is a precipitate caused from the coolants being mixed or reacting with the aluminum in the heat ex-changers. The braising process (I forget the exact terminology) oxygen is used to assemble the heat ex-changers. Well the coolant reacts with this causing a precipitate that will clog ALL of your heat ex-changers in your coolant system. There are three, the radiator, heater core, and oil cooler for the engine. Chrysler has a star report out on this and they are required to replace all three not just one. I contacted a coolant expert about this and he sent me a whole write up about it. Chrysler knows about the problem and so does the industry. It is so common that a water pump company has a you tube video about it. Demand more!! if you want the report email me @ Simmerman3@gmail.com
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Old 06-26-2014, 03:22 PM   #23
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There seem to be a lot of theories out there about what it is... Right off the top of my head I can recall casting sand from the heads, mixing of HOAT and OAT coolant by the dealership topping off for delivery, and now this brazing one.

All sound feasible, is there really one definitive reason?
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Old 06-26-2014, 03:38 PM   #24
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There seem to be a lot of theories out there about what it is... Right off the top of my head I can recall casting sand from the heads, mixing of HOAT and OAT coolant by the dealership topping off for delivery, and now this brazing one. All sound feasible, is there really one definitive reason?
Mixing HOAT and OAT can make a sludgy mess. We were on the road in the wife's commander and it was overheating, only Prestone was avail. It worked fine but I noticed a lot of sludge in the reservoir. Had it flushed and refilled after we got back home. Moral of the story it'd be better to add water if no HOAT is available. Then it's just a drain and refill.

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