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QX60 Overheating & Coolant Loss - Where to Check First?

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Sarah K. · rep 0 · May 22, 5:08 AM · 1 replies · solved · Question

Vehicle: 2020 Infiniti QX60 Pure

Hi all,

My 2020 Infiniti QX60 Pure, with about 55,000 miles, has been giving me some trouble. A few days ago, the 'Low Coolant' warning came on, and the temperature gauge started creeping up. I pulled over, let it cool, and topped off the reservoir with the recommended coolant.

However, the warning came back on yesterday, and I noticed a small puddle under the front passenger side of the car when it was parked overnight. It's definitely coolant. I'm worried about driving it too much. Where should I start looking for the leak? Are there common spots on these QX60s?

Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:08 AM

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ClearTheCode admin answer:

Experiencing coolant loss and overheating warnings in your 2020 Infiniti QX60 is a serious issue that needs prompt attention to prevent engine damage. The puddle you're seeing confirms an active leak.

Here are the common areas to inspect for coolant leaks on a QX60:

  1. Radiator: Check the radiator fins and end tanks for any signs of wetness, discoloration, or drips. The plastic end tanks are a common failure point over time.
  2. Hoses: Inspect all radiator hoses (upper and lower), heater hoses, and smaller bypass hoses for cracks, bulges, or loose clamps. Pay close attention to where hoses connect to components.
  3. Water Pump: The water pump is crucial for circulating coolant. Look for leaks around the pump's housing, especially near the pulley. A failing water pump often leaks from its weep hole.
  4. Coolant Reservoir: Check the reservoir itself for cracks and ensure the cap is sealing properly.
  5. Thermostat Housing: The housing where the thermostat is located can sometimes develop leaks, especially if it's made of plastic.
  6. Heater Core: If you notice a sweet smell inside the cabin or moisture on the passenger floorboard, it could indicate a leaking heater core, though this is less common for external puddles.

Diagnostic Steps:

  • Visual Inspection: With the engine cold, carefully inspect all the areas mentioned above. A flashlight can help. Look for pink/red (if using Nissan Long Life Coolant) or green residue.
  • Pressure Test: A cooling system pressure tester (available at auto parts stores for rent) can help pinpoint elusive leaks. You pump air into the system, and the pressure drop will reveal the leak point.

OBD Codes: While a direct leak won't always trigger a specific OBD code, persistent low coolant or overheating can lead to codes like:

  • P0128: Coolant Thermostat (Coolant Temperature Below Regulating Temperature) - often triggered if the engine struggles to reach operating temperature due to low coolant or a stuck-open thermostat.
  • P0117: Engine Coolant Temperature Sensor Low Input - could be related if the sensor is exposed to air instead of coolant.

When to see a shop:

  • Immediately: Do not drive the car if it's actively overheating or losing coolant rapidly. You risk severe engine damage.
  • If you cannot locate the leak yourself, or if it appears to be from a difficult-to-access component (like the water pump or behind the engine), a professional diagnosis is essential. They have specialized tools and expertise to quickly identify and repair the issue.
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