2.0 Coolant Reservoir Replacement

[SCJeeps]

So I just finished replacing my coolant reservoir on my 2023 JLUR 2.0 with <20k miles. I had noticed that I had to top if off a few times but couldn’t find the leak. Finally I found white residue on one of the seams, it looks like it has leaked as steam but had sealed itself up. I didn’t want to wait for this to fail so I ordered up a new reservoir. I was lucky and found a dealer that had one in stock as most places were on back order.

A few tips from the install:
I ended up removing the aluminum mount that holds the tank to allow more flexibility when trying to disconnect the lines.
I used a turkey baster to suck out the coolant from the tank prior to replacement. I actually saved all the coolant and just reused it to fill it back up! This also meant there was very little that leaked out when I disconnected the hose at the bottom.

I noticed quite a few differences in the old tank versus the new tank. Clearly my old tank had some issues at the seam .

The old tank had the Mopar emblem in the background.

You can see the seam was rough and had some residue in it.

See how clean the new tank looks at the seam. The parting lines are very smooth and uniform.

New on left, note the cap is different. The new cap did not have the dipstick. I used my old cap with the dipstick to make reading level easier.

Rear view of the tanks.

Look how poor the seam was in the old tank, there is plastic that looks like it got pulled away. More signs of a bad part.

There were no markings on the new tank but it came in the appropriate Mopar packaging that was sealed.
My advice is it inspect a new tank prior to purchase if possible. Based upon my experience these clearly had some quality issues. I guess time will tell if this new tank holds up.

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[JLUR Farout]

My 2024 is at 21,800 miles. Knock on wood, no coolant leak issues thus far.

 

[ScotM]

I bought an aluminum one. On my list of things to do

 

[Air Uncle P]

Got my 3.6 back from dealer after a rocker arm, coolant issue. Should I have concern that they filled the tank so full.?

 

[Heimkehr]

Got my 3.6 back from dealer after a rocker arm, coolant issue.
Should I have concern that they filled the tank so full.?

You might consider removing the surplus fluid with a baster, after the engine has fully cooled.

The only value in leaving the original overfill in the coolant reservoir is if there's air in the system that works itself out, which in turn would be replaced by the excess fluid. The issue there is that any such air bubble can probably be walked back to an incorrect (re)fill procedure at the dealer, after the rocker arm and coolant issue (whatever it was) was attended to. You'd have to know that air was in the cooling circuit, and that it's capable of working itself out/trading places with your excess coolant. That's possibly more trouble than it's worth, so...back to my original suggestion.

 

[Air Uncle P]

Thank you for the insight. I plan on taking out the extra today.

 

[KBurnett]

Got my 3.6 back from dealer after a rocker arm, coolant issue. Should I have concern that they filled the tank so full.?

Yes, because when it gets hot, it will expand & possible crack the tank. I would take some out.

 

[mrm143]

Sorry to bring this old thread back up. Had to replace the fitting that goes to the thermostat and when refilling the lost coolant I noticed it would come out of the bottom of the black reservoir which is brand new as of last year. Does it have weep holes in the bottom of it that the extra coolant comes out of if it gets overfilled??

 

[ScotM]

Sorry to bring this old thread back up. Had to replace the fitting that goes to the thermostat and when refilling the lost coolant I noticed it would come out of the bottom of the black reservoir which is brand new as of last year. Does it have weep holes in the bottom of it that the extra coolant comes out of if it gets overfilled??

No , coolant should not come out of the bottom of the black reservoir. Most likely, the fitting is not seated properly. You will have to drain the reservoir, remove the reservoir and reseat the fitting.

 

[mrm143]

No , coolant should not come out of the bottom of the black reservoir. Most likely, the fitting is not seated properly. You will have to drain the reservoir, remove the reservoir and reseat the fitting.

Not the fitting. It’s literally a hole underneath on the tank itself. I will try to find a picture

 

[ScotM]

Not the fitting. It’s literally a hole underneath on the tank itself. I will try to find a picture

Yes, if the coolant tank is way overfilled, there is a small weep hole near the cap that can cause coolant to flow out of the hole you identified

 

[ScotM]

Or it could be a pressure issue as well. Something is not right, and you are seeing the coolant overflow

 

[croppz]

Just wanna bump this and say thanks. Been chasing phantom coolant loss on mine. No leaks or signs. Pulled the tank and the fire wall side of it looks exactly like yours did. So i guess i gotta decide what route I wanna take.

 

[jackal98]

I have a coolant leak & it was at the black tank everyone is showing.
Do yourself a favor, change it out, & keep a spare or 2 on hand.
If you can, try to pressure test it & check the hoses as well.
(I have under 45k miles on a 2020 Rubicon)

 

[croppz]

I have a coolant leak & it was at the black tank everyone is showing.
Do yourself a favor, change it out, & keep a spare or 2 on hand.
If you can, try to pressure test it & check the hoses as well.
(I have under 45k miles on a 2020 Rubicon)

Yea the tank sucks. I ended up biting the bullet and shelling out for the Baja customs aluminum heater hose tee and the mishimoto coolant tank.

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