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2016 Jeep Cherokee Coolant Flush & Type - P0128 code?

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David L. · rep 0 · May 25, 2:24 AM · 1 replies · solved · Question

Vehicle: 2016 Jeep Cherokee Limited

Hi all,

I own a 2016 Jeep Cherokee Limited with the 3.2L V6, and it's approaching 80,000 miles. I'm thinking it's time for a coolant flush, but I'm unsure about the exact type of coolant it takes. I've heard there are different kinds, and using the wrong one can be bad.

Also, recently I had a Check Engine Light come on briefly, and a scan showed a P0128 code, which I think relates to the thermostat. Could this be related to old coolant or just a failing thermostat? Is a coolant flush something I can tackle at home?

Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:24 AM

0

ClearTheCode admin answer:

It's smart to consider a coolant flush for your 2016 Jeep Cherokee Limited with 80,000 miles. Coolant degrades over time, losing its corrosion protection and heat transfer properties. Using the correct coolant is absolutely critical for modern engines.

Here's what you need to know:

  1. Coolant Type: Your 2016 Jeep Cherokee with the 3.2L V6 typically uses OAT (Organic Acid Technology) coolant, specifically Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula (Purple/Pink color). It's crucial not to mix different types of coolants (e.g., OAT with HOAT or IAT) as this can lead to gelling, corrosion, and severe engine damage. Always verify the exact specification in your owner's manual.
  2. P0128 Code (Thermostat Rationality): This code indicates that the engine coolant temperature is remaining below the thermostat regulating temperature. While a failing thermostat is the most common cause, old or low coolant levels can sometimes contribute to the issue. A proper coolant flush and fill, especially if the system has air pockets or is low, might resolve minor temperature regulation issues, but a faulty thermostat often needs replacement.
    • Action: If you have a persistent P0128, plan to replace the thermostat. It's often recommended to do this during a coolant flush.
  3. DIY Coolant Flush Procedure: This is a moderately challenging DIY task. If you're comfortable working under your vehicle, it's doable.
    • Safety First: Ensure the engine is completely cool before starting. Wear appropriate safety gear (gloves, eye protection).
    • Drain: Locate the radiator drain plug (petcock) and carefully drain the old coolant into a suitable container for proper disposal. Some vehicles also have engine block drains.
    • Flush: Refill with distilled water (never tap water) and run the engine with the heater on until it reaches operating temperature. Drain again. Repeat this process until the drained water runs clear. You can also use a specialized flush product, but follow its instructions carefully.
    • Fill: Close all drains. Slowly fill the system with the correct 50/50 mix of OAT coolant and distilled water. Bleed any air from the system by running the engine with the heater on high, periodically squeezing hoses, and topping off the reservoir as needed until the level stabilizes and no more bubbles appear.
  4. When to See a Shop: If you're unsure about the process, encounter difficulty bleeding the system, or if the P0128 code persists after a new thermostat and flush, it's best to consult a professional. They have specialized vacuum fill tools that can prevent air pockets, which are critical for proper cooling system function.
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