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2016 Chrysler 300 Coolant Type and DIY Flush

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David L. · rep 0 · May 25, 4:25 AM · 1 replies · solved · Question

Vehicle: 2016 Chrysler 300C 3.6L

Hello Chrysler owners,

I have a 2016 Chrysler 300C with the 3.6L Pentastar engine. I recently noticed my coolant reservoir is a bit low, and I want to top it off. More importantly, I'm thinking about doing a full coolant flush and refill soon, as I'm not sure when it was last done.

My main questions are: What specific type of coolant does this model require? I know Chrysler uses a special kind. Also, for a DIY flush, what's the best procedure to ensure all the old coolant is out and I don't introduce air pockets into the system?

Any tips or warnings would be great. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:25 AM

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Hi David,

It's great you're being proactive about your 2016 Chrysler 300C's cooling system! Using the correct coolant and performing a proper flush are crucial for the longevity of your engine. Chrysler vehicles from your model year, especially those with the 3.6L Pentastar engine, require a specific type of coolant.

  1. Correct Coolant Type: Your 2016 Chrysler 300C requires OAT (Organic Acid Technology) coolant, specifically Mopar Antifreeze/Coolant 10 Year/150,000 Mile (Purple in color, part number 68163848AB or equivalent). Do NOT mix this with HOAT (Hybrid Organic Acid Technology) or any other coolant types, as it can lead to sludge formation and severe cooling system damage.

  2. DIY Flush Procedure:

    • Safety First: Ensure the engine is completely cool before starting. Wear appropriate safety gear (gloves, eye protection).
    • Drain Old Coolant: Place a large drain pan under the radiator. Open the radiator drain cock (petcock) and remove the radiator cap to allow it to drain fully. Some vehicles also have engine block drain plugs, which should ideally be opened for a more complete drain.
    • Flush with Distilled Water: Close the drain cock. Fill the system with distilled water. Run the engine with the heater on high until it reaches operating temperature. Let it cool, then drain the distilled water. Repeat this process until the drained water runs clear.
    • Refill with OAT Coolant: Close the drain cock. Fill the system with the correct 50/50 OAT coolant mix. Slowly fill the reservoir to the 'MAX' line.
    • Bleed Air: Start the engine with the radiator cap off (or reservoir cap if it's a closed system). Run the heater on high. Squeeze the upper and lower radiator hoses repeatedly to help dislodge air bubbles. Monitor the coolant level and top off as needed. Continue until no more bubbles appear and the thermostat has opened (you'll feel the lower radiator hose get hot).
    • Final Check: Drive the vehicle, allow it to cool, and recheck the coolant level in the reservoir, topping off if necessary.

When to See a Shop:

  • If you're unsure about the process or uncomfortable working with engine fluids.
  • If your vehicle has persistent overheating issues or you suspect a leak.
  • If you can't get all the air out of the system after multiple attempts, as air pockets can cause significant cooling problems.
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