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2019 Grand Caravan 3.6L - Coolant Leak and Overheating Warning

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Sarah K. · rep 0 · May 22, 5:39 AM · 1 replies · solved · Question

Vehicle: 2019 Dodge Grand Caravan SXT

Hi everyone, I'm having a problem with my 2019 Dodge Grand Caravan, 3.6L Pentastar engine. Recently, I've noticed a sweet smell coming from the engine bay, and I've had to add coolant a couple of times in the last month. There's a small puddle forming under the front of the car after it's been parked for a while.

Yesterday, the temperature gauge started creeping up, and I got a 'low coolant' warning on the dash. I pulled over and let it cool down, then added more coolant. It seems to be leaking somewhere, but I can't quite pinpoint it. It's got about 60,000 miles on it.

Could this be a common issue with the Pentastar engine? What should I be looking for? I'm worried about overheating the engine. Any help is appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:39 AM

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ClearTheCode admin answer:

Your 2019 Dodge Grand Caravan's symptoms of a sweet smell, visible coolant leaks, and overheating warnings are classic signs of a cooling system problem, which is unfortunately a known area of concern for the 3.6L Pentastar engine in various Chrysler/Dodge vehicles.

Common Causes:

  1. Water Pump Failure: This is arguably the most common culprit. The water pump on the 3.6L Pentastar engine is known to develop leaks, often from the weep hole or around the gasket. The leak can be intermittent at first and worsen over time.
  2. Oil Filter Housing/Cooler Leak: The oil filter housing assembly, which also contains the engine oil cooler, is located in the valley of the engine. It's made of plastic and can crack or warp, leading to both oil and coolant leaks. Coolant can pool in the valley before dripping down.
  3. Radiator or Hose Leaks: While less specific to the Pentastar, general wear and tear can cause leaks in the radiator core, end tanks, or any of the rubber coolant hoses.
  4. Thermostat Housing Leak: The thermostat housing, often plastic, can also crack or develop leaks around its seal.

Diagnostics & Next Steps:

  1. Visual Inspection: Carefully inspect the front of the engine, especially around the serpentine belt area (where the water pump is located) and underneath the intake manifold (for the oil filter housing). Look for pinkish or greenish residue, which indicates dried coolant.
  2. Check Coolant Level and Condition: Ensure the coolant reservoir is filled to the proper level. Note if the coolant appears dirty or sludgy.
  3. Pressure Test (Professional): A cooling system pressure test is the most effective way to pinpoint leaks. A shop can pressurize the system when the engine is cold, making leaks more visible.
  4. Scan for Codes: While a direct leak won't always trigger a check engine light, persistent low coolant or overheating can lead to codes like:
    • P0128: Coolant Thermostat (Coolant Temperature Below Regulating Temperature) - if the thermostat is stuck open or the engine isn't reaching operating temp due to low coolant.

When to See a Shop:

  • Immediately: If the temperature gauge goes into the red, or you get a 'STOP ENGINE' warning. Pull over safely and shut off the engine to prevent severe damage like a blown head gasket. Have the vehicle towed.
  • Soon: Given the consistent leak and overheating warnings, it's crucial to have your Grand Caravan inspected by a qualified mechanic as soon as possible. Continuing to drive with a significant coolant leak risks severe engine damage. A professional can accurately diagnose the source of the leak and perform the necessary repairs, which often involves replacing the water pump or the oil filter housing assembly.
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