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Old 05-26-2019, 11:58 AM
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2018 jku engine coolant below low level

While replacing the oil, I noticed the coolant below low. It still has the original coolant. Can I simply add new coolant to the one already in there or must I flush it entirely then replace with new?

Either way I go, what is the recommended coolant to go with?

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Old 05-26-2019, 12:33 PM   #2
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Make sure you get the correct HOAT vs. OAT based on what is in your owners manual. If you get it wrong, it will turn your coolant to sludge and it is a mess.

I paid the extra and got from the dealership to avoid getting the wrong one (not even sure you can get the correct stuff at a parts store).


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Old 05-26-2019, 12:35 PM   #3
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Just top off your expansion tank with Mopar OAT coolant. I get the 50/50 premixed stuff. The part number is 68163849AB. You can get it at any FCA dealership. Make sure you verify the part number before you leave the dealership. I've had them try and give me HOAT instead of OAT, which will cause huge problems if you add it to your expansion tank. If you use jiffy lube type places for oil changes, never let them top of your coolant tank. They will always use the wrong stuff.
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Old 05-26-2019, 12:37 PM   #4
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Your's uses 50/50 mix OAT. When cold, fill it to about 2" above the minimum level.
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Old 05-26-2019, 12:52 PM
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Thanks for the quick responses and tips!

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Old 05-26-2019, 12:54 PM
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Oh one more Q, will this be enough to do 2 vehicles? I have a 2017 and 2018 both about a few inches below min level...

https://www.amazon.com/Mopar-Year-Mi...63849AB&sr=8-2

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Old 05-26-2019, 01:08 PM   #7
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yes more than enough, do not over fill or the first time you go offroad you will be wondering why you are leaking anti-freeze all over the place as it will slosh out of the reservoir. I personally keep it at the min line when cold.
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Old 05-26-2019, 01:08 PM
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Awesome thx!

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Old 05-26-2019, 09:35 PM   #9
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Quote:
Originally Posted by trailhunter View Post
Oh one more Q, will this be enough to do 2 vehicles? I have a 2017 and 2018 both about a few inches below min level...

https://www.amazon.com/Mopar-Year-Mi...63849AB&sr=8-2

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I have never paid $25 at the dealership. I'd skip Amazon in this case.
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Old 05-26-2019, 09:43 PM
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I have never paid $25 at the dealership. I'd skip Amazon in this case.
What's the stealership charge for a gallon normally?

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Old 05-27-2019, 12:42 PM   #11
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There are several brands of long life coolant that are advertised and labeled MIX WITH ANY COOLANT, Any thoughts, concerns, experience with use to top off?
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Old 05-27-2019, 12:50 PM   #12
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^^^They are not compatible with OAT ANTIFREEZE. I purchase mine from the Dealer.
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Old 05-27-2019, 01:30 PM   #13
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I've been dealing with a coolant leak for a couple months now with it finally being resolved as a cracked radiator on Friday. I've been topping it up with coolant that is "Jeep Compatible" from NAPA to the tune of 1/4 gallon so far. I've been very open with the Jeep dealership about what I've been adding and there were no gasps or "shouldnt have done that" out of them. Issue being is when you need coolant, and the nearest dealership is 240km away, your choices are very limited. It should all get flushed and replaced this Friday when they put a new radiator in.
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Old 05-27-2019, 05:24 PM   #14
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There are several brands of long life coolant that are advertised and labeled MIX WITH ANY COOLANT, Any thoughts, concerns, experience with use to top off?

OAT coolants have delicately engineered anti-corrosion properties, so you have to stay pretty close to a full charge to maintain corrosion protection. In a post-HOAT vehicle it's probably best to top off with an OEM-approved coolant.


Maybe you can get away with topping off once or twice with a universal, but the people who know the percentages haven't been too vocal.

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