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Coolant flush for my 2020 Ram 1500 3.6L Pentastar

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Mike T. · rep 0 · May 25, 2:32 AM · 1 replies · solved · Question

Vehicle: 2020 Ram 1500 Big Horn

Hey everyone,

I've got a 2020 Ram 1500 Big Horn with the 3.6L Pentastar engine, and it's approaching 75,000 miles. I've been thinking about doing a coolant flush, as I'm not sure if it's ever been done. The truck runs fine, but I want to stay ahead of any potential cooling system issues.

What's the recommended coolant type for this engine, and what's the typical service interval? Is a full flush necessary, or can I just drain and refill? Also, any common pitfalls to watch out for when doing this myself? Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:32 AM

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ClearTheCode admin answer:

Proactive maintenance of your cooling system is an excellent idea for your 2020 Ram 1500 3.6L Pentastar. Here's the rundown:

  1. Coolant Type: Your truck requires OAT (Organic Acid Technology) coolant, specifically Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula (Purple/Pink color). It's crucial to use the correct OAT coolant and not mix it with other types (like HOAT or IAT), as this can lead to gel formation and severe cooling system damage.

  2. Service Interval: For the 3.6L Pentastar, the recommended initial coolant change is at 10 years or 150,000 miles, whichever comes first. However, if you're concerned or if the coolant looks discolored, an earlier change is not harmful. Given your mileage, it's not strictly due yet, but doing it now is good preventative maintenance.

  3. Flush vs. Drain/Refill: A full flush is ideal to remove all old coolant and sediment. However, a thorough drain and refill (multiple times if necessary to dilute residual old coolant) can be effective for DIYers. Ensure you drain from the radiator and potentially block drains if accessible. Always use distilled water for mixing if you're using concentrate.

  4. Common Pitfalls:

    • Air Pockets: The Pentastar engine can be prone to air pockets in the cooling system. After refilling, run the engine with the heater on high (fan low) and the radiator cap off (or reservoir cap loose) to allow air to escape. Squeeze hoses gently. You might need to top off the reservoir over the next few drive cycles.
    • Incorrect Coolant: As mentioned, mixing coolant types is a big no-no.
    • Incomplete Drain: Not draining enough old coolant.

Causes of cooling system problems:

  • Corroded or depleted coolant leading to radiator/heater core clogs.
  • Failed thermostat (stuck open or closed).
  • Leaking water pump or hoses.

When to see a shop:

  • If you're experiencing persistent overheating or a dashboard temperature warning.
  • If you find significant leaks or a damaged radiator/hoses.
  • If you're uncomfortable with the bleeding process and ensuring all air is out of the system.
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