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Old 04-20-2015, 06:20 AM
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Brown sludge scum in coolant bottle.

27,000 kms two services and whilst familiarising myself with components in the engine bay I noticed the sludge on the walls of the coolant bottle. I got some on my finger smeared it on my hand and it felt and smelt like thick oil or grease. I'll post a pic when I get time.

Check your bottles.

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Old 04-20-2015, 05:59 PM
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Re: Brown sludge scum in coolant bottle.

^^^ - Doesn't sound good at all! Good luck!
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Old 04-20-2015, 07:41 PM
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Re: Brown sludge scum in coolant bottle.

Sludge not good. Foam is even worse.
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Old 04-20-2015, 08:06 PM
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Re: Brown sludge scum in coolant bottle.

At least it's organic sludge.
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Old 04-21-2015, 12:36 AM
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Re: Brown sludge scum in coolant bottle.

You need to check the color of your coolant/antifreeze....I have a 14 SRT and went to replace my thermostat with a Mishimoto 180' one. I found the same kind of brown sludge (looks just like mud) in both my over flow bottle and in the radiator under the radiator cap...now I bought this jeep brand new and mine only has about 8,000 miles on it. I found the coolant that was in my Jeep to be an Orange/pinkish color... Now my owners manual calls for only using an "OAT" formulation antifreeze in my Jeep and never mixing it with any other type...So I went to my dealer and asked him what is supposed to be in my Jeep....He checked my VIN number and agreed that my Jeep should have come with "10 year /150K mile "OAT" PURPLE antifreeze/coolant factory installed, He had me go to the service dept and they had a Service advisor look at my coolant, and he said the " OAT" coolant is colored purple, but that the Orange/Pink stuff in my car was the same and that was how it really looked....OK, So I do some internet seacrhing and find this.... In 2013 Chrysler did a change from "HOAT" antifreeze/coolant to "OAT" in all it's Vehicles.....Now I also found out that Chrysler's "HOAT" antifreeze is, READY for this?, Orange / Pink in color, and since my Jeep is a 2014 that is not what was supposed to be in it.....and that it should NEVER be mixed with "OAT" antifreeze, which is purple in color from Chrysler.... see warning in owners manual!, it also says if they ever do get mixed you must do a system flush, or damage to your system will result........ So I bought $80.00 worth (4gals 16qts) of new Mopar "OAT" 10yr/150k Purple antifreeze/coolant..... I spent about 2 hours flushing out my system, also washing out as much of this brown mud as possible, installed my new thermostat, a polished billet housing and race glass, and hopefully now all is right with the world........but I still wonder why I had this Orange coolant in my vehicle in the first place? To my knowledge no work was ever done on my Jeep that would require draining or adding antifreeze/coolant to my Jeep. I think this Brown Mud is a result of someone somewhere mixing "OAT" & "HOAT" coolants in my system....... I also read where Fiat/Chrysler did put some (ORANGE) "OAT" coolant into Dodge Darts and another model right around the time they did their"HOAT to OAT" Corprate changeover in 2013.....So I don't really know how to gauge what they put into some of our Jeeps, or if somewhere someone mixed them up.....I would suggest to anyone who is un clear of what they have, and if they are getting a mud like residue, that they flush out their systems, or get their dealer to do it under warranty, and make sure they have the Purple coolant installed........or whatever type their owners manual calls for.......note: most of the after market coolant/antifreezes that say they are universally compatable with all cars, aren't "OAT" compatable formulations......Currently, the dealership was about the only place I could find the correct "OAT" antifreeze....
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Old 04-21-2015, 03:47 AM
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Re: Brown sludge scum in coolant bottle.

The Weavman,

Thanks for the detailed response.

Yep up to speed on the whole coolant thing and not mix and matching.

Mine is more pink than purple.

I took some Pics on phone earlier will try to up load. Nup no luck uploading.

Cheers
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Old 04-21-2015, 03:52 AM
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Re: Brown sludge scum in coolant bottle.

Yeah mine is more orange/pink and was built march 2014, there is an excessive amount of this crap lining the walls of the coolant bottle.
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Old 04-21-2015, 08:08 AM
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Re: Brown sludge scum in coolant bottle.

This thread caused me to check my coolant color in my 2013 and yea, it's light orange ��/pink. The User Guide that came with it agrees that that's the correct coolant formula.

Thanks for all the relevant info yall.

Dan
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Old 04-30-2015, 10:18 PM
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Re: Brown sludge scum in coolant bottle.

I was the victim of brown sludge in a GM vehicle that someone had mixed regular green antifreeze with dexcool before I bought it. I flushed the system several times over the years and had to replace the thermostat and radiator cap many times because they would get stuck. Finally the radiator got clogged enough it had to be replaced. That gunk just kept coming back. Hope you have better luck.
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Old 04-30-2015, 11:10 PM
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Re: Brown sludge scum in coolant bottle.

Sounds to me like your WK2 had the wrong coolant filled right at the factory.

Your not the only one!

At the changeover point some OEM coolant fills where done incorrectly with both the older (Orange/Pinkish) HOAT and newer (Purple) OAT, that's why your seeing that brownish sludge in the cooling system.
What was your build date?

You should have had your dealer do the flush and document this issue. You may have not flushed all your potential problems away. Did you run the heat while flushing? Open up the block drains?

Good Luck, I hope you got all that brown sludge out!
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Old 05-01-2015, 12:27 AM
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Re: Brown sludge scum in coolant bottle.

Thanks, Hope I caught it soon enough, I will keep an eye on it.... May have to flush it again, but that purple antifreeze gets expensive
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Old 05-01-2015, 01:40 AM
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Re: Brown sludge scum in coolant bottle.

Quote:
Originally Posted by Raptor View Post
Sounds to me like your WK2 had the wrong coolant filled right at the factory.

Your not the only one!

At the changeover point some OEM coolant fills where done incorrectly with both the older (Orange/Pinkish) HOAT and newer (Purple) OAT, that's why your seeing that brownish sludge in the cooling system.
What was your build date?

You should have had your dealer do the flush and document this issue. You may have not flushed all your potential problems away. Did you run the heat while flushing? Open up the block drains?

Good Luck, I hope you got all that brown sludge out!
Build date 31/03/2014 is my build date. We have been thru the replacement axles, camera debarcle and now this.

You say at the change over point some OEM COOLANTS got mixed. Where did this happen and what proof or insight can you add to give me a better understanding of what you say transpired.

I believe my SRT Mate was the first to post about the front axles and we share that six week build period.

Vehicle goes in Monday morning and now the local dealer is getting dark on me for enquiring as to what oil t they are using and when
I said it didn't meet Chrysler spec ms11106 they finally stated the oil does meet the spec for the engine in my vehicle.

So from an historical point of view, I believe I read g some where the engine was originally being developed by GM and VM and years later ended up being a Fiat /VM???

If the engine was originally being joint venture with GM then I'd bet I know why the dealership claims the oil meets spec.

Appreciate any further information to advance my position come Monday

Cheers
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