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2018 Discovery Sport HSE - Persistent Low Coolant Warning & Small Puddle

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Brian F. · rep 0 · May 22, 6:35 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Discovery Sport HSE

Hey everyone,

I've been getting a 'Low Coolant' warning on my dashboard for my 2018 Land Rover Discovery Sport HSE. It started intermittently a few weeks ago, and now it's pretty consistent. I've topped it off a couple of times with the correct Land Rover specified coolant, but the level drops again after a few days.

This morning, I noticed a small, greenish-blue puddle under the front passenger side of the car after it had been parked overnight. It's definitely coolant. The engine temperature gauge seems normal, but I'm worried about potential damage.

Has anyone experienced this with their Discovery Sport? What are the common culprits for coolant leaks on these models? I'm hoping it's something I can check myself before taking it to the dealership. Any advice on where to start looking would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:35 AM

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ClearTheCode admin answer:

Experiencing a low coolant warning and finding puddles under your 2018 Land Rover Discovery Sport HSE is a clear indication of a leak that needs immediate attention. While the temperature gauge might seem normal now, a persistent leak can lead to overheating and severe engine damage if not addressed promptly.

Here are steps you can take to diagnose the issue and common causes:

  1. Visual Inspection (Engine Cold!):

    • Coolant Reservoir: Check for cracks or leaks around the plastic coolant expansion tank itself and its cap. The cap's seal can degrade over time.
    • Hoses and Clamps: Carefully inspect all visible coolant hoses (radiator hoses, heater core hoses) for cracks, bulges, or signs of weeping. Pay close attention to the connection points where hoses attach to components; clamps can loosen or corrode.
    • Radiator: Look for any visible damage, corrosion, or wet spots on the radiator fins. Small punctures can occur from road debris.
    • Water Pump: The water pump is a common failure point. Look for coolant residue or drips coming from the weep hole or around the pump housing, typically located on the front or side of the engine.
    • Thermostat Housing: Inspect the housing where the thermostat is located for leaks, as its seals can fail.

  2. Common Causes for Coolant Leaks on Land Rovers (2016-2026):

    • Degraded Hoses or Loose Clamps: This is often the simplest fix. Rubber hoses can harden and crack, and clamps can lose their tension.
    • Cracked Coolant Reservoir: The plastic tanks can become brittle and crack, especially at seams.
    • Water Pump Failure: The internal seals or bearings of the water pump can fail, leading to leaks.
    • Radiator Leaks: Pinhole leaks from corrosion or impact are possible.
    • Thermostat Housing Gasket Failure: The gasket sealing the thermostat housing can degrade.

  3. OBD Codes: While a direct leak might not always trigger a specific OBD code, a persistent low coolant level or air in the system could lead to codes like P0128 (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)) if the engine struggles to reach or maintain optimal operating temperature.

When to See a Shop:

  • If you cannot locate the source of the leak after a thorough visual inspection.
  • If the leak appears to be from the water pump, radiator, or a difficult-to-access hose, as these repairs often require specialized tools and expertise.
  • If the engine temperature gauge starts to rise above normal, indicating potential overheating.
  • If you suspect a head gasket issue (though less common for just a puddle, watch for white smoke from exhaust or milky oil).

Always use the correct type of coolant specified for your Land Rover to prevent further issues. Continuing to drive with a significant coolant leak can lead to catastrophic engine failure.

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