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2016 Dodge Durango SXT - Low Coolant Warning & Puddle Under Car

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

Vehicle: 2016 Dodge Durango SXT

My 2016 Dodge Durango SXT, with about 90,000 miles, recently flashed a "Low Coolant" warning on the dashboard. I checked under the hood, and sure enough, the coolant reservoir was significantly low. To make matters worse, I found a small green puddle under the front passenger side of the car this morning.

I topped off the reservoir for now, but I'm really worried about a leak. Is this a common problem for Durangos of this year and mileage? What are the usual suspects for coolant leaks on these vehicles? I want to try and pinpoint the source before it becomes a bigger, more expensive issue or causes overheating.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

A low coolant warning combined with a puddle under your 2016 Dodge Durango SXT is a clear indication of a coolant leak. Addressing this promptly is crucial to prevent engine damage from overheating. Here are the common culprits and steps to take:

  1. Common Leak Points:

    • Radiator: The radiator itself can develop cracks, especially around the plastic end tanks, or corrode over time. Look for green or pink residue on the fins or around the edges.
    • Hoses: Radiator hoses (upper and lower), heater hoses, and smaller bypass hoses can crack, swell, or develop leaks at their connections. Squeeze them to check for softness or brittleness.
    • Water Pump: The water pump's shaft seal can fail, leading to leaks, often visible as coolant dripping from the front of the engine near the pump pulley. A grinding noise might also indicate a failing pump bearing.
    • Thermostat Housing: The housing where the thermostat is located can crack or its gasket can fail, causing leaks.
    • Reservoir Tank/Cap: The coolant reservoir itself can crack, or the cap can fail to hold pressure, leading to evaporation and minor leaks.
    • Heater Core: While typically leaking inside the cabin (foggy windows, sweet smell), a severe external leak could potentially drip underneath.

  2. Inspection Steps:

    • Visual Check: With the engine cool, carefully inspect all hoses, the radiator, and around the water pump for visible drips, stains, or crusty coolant residue. A flashlight can help.
    • Pressure Test: The most effective way to find a leak is to have a cooling system pressure test performed. A mechanic can pressurize the system, mimicking operating conditions, making leaks more apparent.
    • Coolant Dye: A UV dye can be added to the coolant. After driving for a bit, use a UV light to easily spot the leak source.

  3. Coolant Type: Ensure you are using the correct Mopar OAT (Organic Additive Technology) coolant, typically purple or sometimes pink/orange, for your Durango. Mixing coolant types can lead to system contamination and damage.

When to See a Shop: If you can't easily locate the leak, or if it appears to be from a major component like the water pump or radiator, it's highly recommended to take your Durango to a qualified mechanic immediately. Driving with a persistent coolant leak risks severe engine overheating and catastrophic damage. A shop can perform a proper pressure test and repair the leak correctly.

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