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  1. #1
    Nothing but a Thing NFRs2000NYC's Avatar
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    Exclamation ATTENTION: Know Your Jeep JK Wrangler Coolants and Save Your Engine!

    Hey guys, I haven't seen a thread like this here, so I would like to post it up...if the higher powers find it useful enough, I think it should be a sticky, as a very innocent move can cause HAVOC on your entire cooling system/motor.....THIS IS BECOMING A VERY COMMON PROBLEM AND WILL ONLY GET WORSE...DEALERS DON'T KNOW WHAT THEY ARE DOING AND ARE JUST DUMPING IN WHATEVER COOLANT IS ON-HAND.

    Ok, first thing is first...there are two types of coolants used on the JK....HOAT (Hybrid Organic Additive Technology,) and OAT (Organic Additive Technology.)

    The first thing you need to tattoo in your brain is this.....THESE TWO COOLANTS DO NOT MIX, AND A CHEMICAL REACTION WILL CAUSE IT TO GEL (more on this later.)

    JK's 2012 and down use HOAT coolant and 2013+ use OAT coolant. DO NOT COUNT ON THE DEALER KNOWING WHICH COOLANT YOUR RIG TAKES. CHANCES ARE THEY WILL PUT IN THE WRONG ONE, SO IF GETTING SERVICE, MAKE CERTAIN THE CORRECT COOLANT IS USED!

    How to tell the difference...For whatever reason, chrysler doesnt label them as HOAT/OAT so you need to know the signs to make sure you are getting the correct one....

    difference.jpg

    The first thing you are going to notice is the color....OAT (13+) is purple and HOAT (12-) is orange. The second thing you'll notice is that the HOAT coolant is rated for 5 years and 100K miles while the OAT is rated at 10 years 150K miles. The third thing you need to know is that the cap on the OAT is black while the cap on the HOAT is blue. The fourth thing you will know (not from the pic) is that OAT is priced like gold. It is $50-$60 a gallon (yes you read that right) so unless you have an emergency, buy it online, where it goes from $29 a gallon or so. If you go to the dealer to buy OAT, and the price is too cheap, they gave you the wrong one.

    A little background on the color so that the next part makes sense to you guys....As we know, FIAT is with Chrysler now. Fiat has been using orange colored OAT for years. When Chrysler switched to OAT, they didn't want dealers/people getting confused, so to differentiate the new OAT coolant with the chrysler original orange HOAT, they added a purple dye. As a result, due to a weird light refraction, the purple OAT looks weird (even orange) when looked at certain angles. You can even pop open your radiator cap on your 14 and the coolant looks so orange you'd bet me your jeep that it's orange....but it isn't.

    You saw the pic above, now compare it to this pic....(same purple OAT)
    colordiff.jpg

    Don't believe me yet? Check this out...open the overflow bottle, and you might see this....
    Orange OAT .JPG

    Orange? You would definitely bet me your PR44 that it's orange right?

    Now lets take a pic by moving the lightsource and changing the angle....
    Purple OAT.JPG

    Still think it's orange?

    The reason why it looks orange isn't too complicated...the actual coolant is Fiat's orange OAT with chrysler's added purple dye. When it is put into a container that isn't see-through or well lit, the sheen from the original orange coolant comes through which is why it looks orange on the surface. If you
    suck a little out using a turkey baster, you will quickly see that it's purple. Think of it as a VERY ANNOYING optical illusion.

    Now, why you should care....mixing the two yields to catastrophic results...if you catch it early enough, you may be able to squeak by with a quick and painful flush...however, if you run it for a little while (a month+) you can completely destroy your system by completely clogging it up.

    This is what happens when you mix glycol based coolant (HOAT, 99% of coolant in stores, etc) with OAT....

    Coolant clog.jpg

    The part number for OAT is 68163849AA

    Here is a TSB from Chrysler:

    TSB - 07-004-12 REV. A
    SUBJECT:
    Attention! Release Of New Engine Coolant Organic Additive Technology (OAT)
    MODELS:
    2013 (D2) Ram Truck (3500 Pick Up)
    2013 (DD) Ram Truck (3500 Chassis Cab)
    2013 (DJ) Ram Truck (2500 Pick Up)
    2013 (DP) Ram Truck (4500 / 5500 Chassis Cab)
    2013 (DX) Ram Truck (Mexico)
    2013 (DS) Ram Truck (1500)
    2013 (FF) Fiat 500
    2013 (JC) Journey
    2013 (JK) Wrangler
    2013 (JS) Avenger/200
    2013 (LC) Challenger
    2013 (LD) Charger
    2013 (LX) 300
    2013 (MK) Compass/Patriot
    2013 (PF) Dart
    2013 (RT) Town & Country/Grand Caravan
    2013 (WD) Durango
    2013 (WK) Grand Cherokee
    2013 (ZD) Viper
    NOTE: This bulletins applies to all vehicle listed above for every engine application
    EXCEPT the 2013 MK equipped with the 2.2L Diesel engine (sales code ENE)
    and the JC vehicle equipped with the 2.0L Diesel engine (sales code EBT).
    NUMBER:
    07-004-12 REV. A

    GROUP:
    Cooling

    DATE:
    November 03, 2012

    DISCUSSION:
    Chrysler Corporation LLC. has released a new engine coolant for the 2013 model year
    vehicles and beyond, for all engine applications except the ones listed in the note above.
    This new coolant is an Organic Additive Technology (OAT) (
    Fig. 1). OAT coolants have a
    service interval of 10 years or 150,000 miles. For heavy duty truck and extreme duty cycle
    applications refer to the Service Information or Owner's Manual for proper maintenance
    schedules.

    CAUTION: Vehicle Damage may occur if dissimilar coolants are mixed!
    Coolants of different technologies are not compatible nor interchangeable (OAT, HOAT or
    IAT).
    Mixing these coolants could result in:
    • accelerated corrosion within the engine and cooling systems.
    • the coolant having an ammonia smell.
    • debris (particles) floating in the coolant.
    Further inspection by the technician may find corrosion in the system. This could show up
    as aluminum pipes turning black in the coolant system, engine overheat, or leaks in the
    coolant system.
    NOTE: If OAT (MOPAR P/N 68163848AA Purple) has been Mixed with HOAT (MOPAR
    P/N 68048953AB Pink Or Factory Fill HOAT Orange (
    Fig. 2) or (Fig. 3)) or any
    other coolants have been mixed, it will be necessary to flush the cooling

    system.
    To sum up....

    If you own a 2012 and DOWN...you can run Chrysler HOAT coolant or any other Chrysler approved HOAT. There aren't many on the market, and the price is basically the same as chrysler's, so for warranty sake, run the OEM stuff. You need to make sure that if you buy from the dealer, you are getting HOAT coolant (blue cap, 100K mile, orange, $14 pricetag) and if the dealer is refilling yours for free, make SURE you tell them to use HOAT....OAT is your only kryptonite.

    If you own a 2013 and up, you MUST USE Chrysler OAT coolant. If you are out on the trail, and need to top off, use distilled water to limp you home, do NOT use coolant from your buddy's truck, etc. If you are the kind of wheeler that carries spare fluids, carry a bottle of OAT with you. If you absolutely MUST use glycol based coolant, flush it out ASAP as soon as you get back home, and refill with the correct coolant. When at the dealer purchasing, make sure you are walking home with the correct bottle (black cap, purple, 10 year 150K label and expensive) and if they are topping off, inform them that you want to make sure they use OAT coolant.


    I hope this post helps some members along the way!

    Dave
    Last edited by NFRs2000NYC; 12-18-2013 at 03:17 PM.

  2. #2
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    A+++ for Dave.

    Hell ya! this is good info to know! Good Job Dave.

  3. #3
    Nothing but a Thing NFRs2000NYC's Avatar
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    Quote Originally Posted by Army_Vet View Post
    Hell ya! this is good info to know! Good Job Dave.
    Thanks brother! With the constant incompetence I always find at dealerships, this will be a big enough headache (replacing the entire cooling system, warranty claim denial, etc) that people need to be aware of the issue and monitor the situation, especially if someone else is going to touch your rig.

  4. #4
    Old Timer Tigrcky's Avatar
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    dang good info!! didnt know this glad i do thank you very much for posting this!!!
    I post therefore I am!!!!
    Anything worth doing is worth overdoing!!

  5. #5
    Nothing but a Thing NFRs2000NYC's Avatar
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    Here are a few more pics of what happens when HOAT and OAT are mixed (these pics are from a Land Rover Freelander that required OAT, but was mixed with HOAT.)

    The Waterpump:



    The head:


    Reading up on the issue, it seems that mixing the two causes a weird reaction, creating flakes of some sort of a plastiky substance, completely clogging up and destroying everything.

    This is on a NIssan (member said this happened in under 5000 miles...ignore the rust, look at those little white balls of crap)



    Anywho, you guys get the point.... Don't mix em!

  6. #6
    Addict Brankz's Avatar
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    What happens if u mix green coolant and the orange hoat one?
    YOUR NEGATIVITY IS WELCOME

  7. #7
    Old Timer Tigrcky's Avatar
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    Quote Originally Posted by Brankz View Post
    What happens if u mix green coolant and the orange hoat one?
    you will either gel up or ruin the seals
    I post therefore I am!!!!
    Anything worth doing is worth overdoing!!

  8. #8
    Addict Brankz's Avatar
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    Quote Originally Posted by Tigrcky View Post
    you will either gel up or ruin the seals
    Seals? What do u mean?
    YOUR NEGATIVITY IS WELCOME

  9. #9
    Hooked BigBoy's Avatar
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    Just brought home a 2014 over the weekend. Thank you for this info, it will be very good to know.

  10. #10
    Old Timer Tigrcky's Avatar
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    Quote Originally Posted by Brankz View Post
    Seals? What do u mean?
    ok a lot of these coolants have a special lubricant in them to keep the seals that touch the cooling system nice and firm and supple, you start taking that lubricant away and the rubber type seals harden crack and start leaking, one example is the seals for the bearings for your water pump which could potentially cause it to lock up the pulley
    I post therefore I am!!!!
    Anything worth doing is worth overdoing!!

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