Engine coolant?

[Radioman]

@ismail1724

In no particular order:

The black plastic tank that you ask about is the pressurized coolant reservoir for the 2.0T's primary cooling circuit. The cap should only be removed, and the fluid level checked and/or topped off, when it is cool to the touch. The tank is opaque because of the polymer chemistry that is required to manage the heat of the adjacent turbocharger assembly. This is why, for example, the same reservoirs on the V6-equipped Jeeps are clear.

Note the presence of a separate coolant reservoir, behind the driver's headlight, for the intercooler circuit. The coolant level in that tank, which is clear because there's no risk of heat damage from surrounding components, must also be monitored and maintained at the correct level.

Use only OAT coolant; the Mopar product is best.

You don't necessarily have a leak in the system at this time, unless you've confirmed the presence of a leak as evidenced by crusty deposits on the related hose fittings, the seam of the reservoir itself, and/or fluid accumulation under the vehicle. Any number of 2.0T owners, myself included, have occasionally had to add coolant until the level eventually stabilizes (as I have also experienced.) The conventional wisdom suggests that there is an underfill at the factory, after which the related air in the system needs to work itself out over time.

Top off the reservoir in your Jeep and monitor it. Consider reaching out to a dealer if you're unsure of anything.

Great response by @Heimkehr (James) and my experience also with the 2.0L.

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[roaniecowpony]

Probably worth buying one of these kits to test for a blown head gasket.
https://www.amazon.com/Block-Tester...&sprefix=coolant+chemical+test,aps,298&sr=8-6

 

[JeepCares]

I was checking the fluids on this 2025 jlu wrangler rubicon I recently purchased and noticed that this black reservoir with black cap right next to the clear reservoir one might be a little low on fluid. I think this is the engine coolant reservoir, can someone verify this? I don't want to add incorrect fluid. Is this dangerously low or nothing to be worried about?

Hello, if you would like to schedule an appointment with an authorized Jeep dealership for this concern, please send us a private message for additional support.

Yenori
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[ismail1724]

Update post, with some better pictures this time lol.
I topped it off with some mopar 50/50 coolant and it took about 3/4 of a quart.

No noticeable leaks. It might have just been like Heimkehr stated. Going to monitor it and see if it drops in the future. Thank you everyone for your help!

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