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Low Coolant Warning on 2017 Challenger SXT - What to Check?

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Mike T. · rep 0 · May 25, 4:18 AM · 1 replies · solved · Question

Vehicle: 2017 Dodge Challenger SXT

My 2017 Dodge Challenger SXT (3.6L V6) recently displayed a "Low Coolant" warning on the dash. I checked the reservoir, and it was indeed a bit low. I topped it off with the correct OAT coolant, but I'm worried about why it was low in the first place.

There are no visible leaks on my driveway, and the engine temperature seems normal. Could it be a slow leak, or something else I should be looking for? Any common spots for leaks on these Challengers?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:18 AM

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A low coolant warning, even if you don't see visible puddles, indicates a leak somewhere in the system. For your 2017 Dodge Challenger SXT with the 3.6L Pentastar V6, here's a methodical approach:

  1. Pressure Test: The most effective way to find a slow leak is a cooling system pressure test. A mechanic will connect a pump to your radiator cap and pressurize the system to its operating pressure. This will often reveal leaks that only appear under pressure when the engine is hot.
  2. Common Leak Points (3.6L Pentastar):
    • Water Pump: The water pump is a common failure point. Look for coolant stains or drips around the front of the engine, often near the serpentine belt.
    • Radiator: Check the radiator fins and end tanks for any signs of seepage. Sometimes, small pinhole leaks only show up when the system is hot and pressurized.
    • Hoses & Clamps: Inspect all radiator hoses (upper and lower), heater hoses, and their connections for cracks, swelling, or corrosion around the clamps.
    • Thermostat Housing: The plastic thermostat housing can sometimes crack or warp, leading to leaks.
    • Oil Cooler/Filter Housing: On the 3.6L, the oil filter housing assembly, which often integrates an oil cooler, is a known leak source for both oil and coolant. Check for a mix of fluids or distinct coolant stains in that area.
  3. Coolant Type: Ensure you used the correct OAT (Organic Acid Technology) coolant, typically purple or pink/orange, as specified by Mopar. Mixing coolant types can cause gelling and system damage.
  4. Burping the System: After topping off, ensure there's no air trapped in the system. Run the engine with the heater on high and the radiator cap off (or reservoir cap loose) until the thermostat opens, adding coolant as needed. Air pockets can cause temporary low level warnings.
  5. When to See a Shop: If you can't find the leak visually or with a simple inspection, or if the warning light returns after topping off, it's crucial to take your car to a professional. A persistent coolant leak can lead to overheating, which can cause severe and expensive engine damage. Also, if you're getting a P0128 (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)) code, it might indicate a failing thermostat or a system not reaching proper operating temperature, potentially related to coolant loss.
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