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2018 Discovery Sport - Persistent Low Coolant Warning & Sweet Smell

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Melissa G. · rep 0 · May 22, 6:28 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Discovery Sport HSE

Hey everyone,

I've got a 2018 Land Rover Discovery Sport HSE with the 2.0L Ingenium engine, and I'm running into a frustrating issue. For the past few weeks, I've been getting the 'Low Coolant Level' warning on my dash, usually after driving for a bit. I've topped it off a couple of times, but the warning always comes back within a week or two.

I've also noticed a faint, sweet smell, especially after the engine has warmed up, but I can't seem to find any visible puddles or drips under the car when it's parked. I've checked around the reservoir and hoses as best I can, but everything looks dry.

Has anyone else experienced this with their Discovery Sport or similar Ingenium engine? What should I be looking for? I'm worried about potential overheating, especially with summer coming up. Any advice on common leak spots or diagnostics would be greatly appreciated before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:28 AM

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ClearTheCode admin answer:

It sounds like you're dealing with a common issue for many modern vehicles, including your 2018 Land Rover Discovery Sport HSE: a slow, external coolant leak that isn't immediately obvious. The sweet smell is a strong indicator of evaporating coolant. Addressing this promptly is crucial to prevent engine damage from overheating.

Here are the common causes and steps you can take:

  1. Common Leak Points:

    • Water Pump: The seals on the water pump can degrade over time, leading to leaks, especially from the weep hole.
    • Thermostat Housing/Coolant Outlet Pipe: These components are often made of plastic and can become brittle, crack, or have seal failures. This is a very frequent failure point on Ingenium engines.
    • Hoses and Clamps: Check all coolant hoses (radiator, heater core, bypass hoses) for cracks, bulges, or loose clamps. Leaks can occur at the connection points.
    • Radiator: Small cracks or corrosion in the radiator fins or end tanks can cause slow leaks.
    • Coolant Reservoir/Expansion Tank: Cracks in the plastic tank itself or a faulty cap can lead to coolant loss.
    • EGR Cooler (if equipped): Internal leaks in the EGR cooler can sometimes lead to coolant loss, though this usually presents with other symptoms like white smoke from the exhaust.

  2. Diagnostics You Can Perform:

    • Visual Inspection (Cold Engine): With the engine cold, carefully inspect all the areas mentioned above. Use a flashlight to look for dried coolant residue (often pink, orange, or green crusty stains) around connections, seams, and under components.
    • Pressure Test: A cooling system pressure test is the most effective way to find slow leaks. A mechanic will pressurize the system to its operating pressure and then look for drops in pressure and visible leaks. This can often reveal leaks that only occur under pressure.
    • UV Dye: A UV dye can be added to the coolant. After driving for a day or two, a UV light will illuminate the leak source, making it much easier to spot.

  3. When to See a Shop:

    • Immediately: If your 'Low Coolant Level' warning becomes frequent, or if you notice the engine temperature gauge rising above normal. Continuing to drive with low coolant can lead to severe engine damage (e.g., warped cylinder head, blown head gasket).
    • For Diagnosis: If you cannot locate the leak yourself, or if you suspect it's from a difficult-to-access component like the water pump or thermostat housing, it's best to take it to a qualified Land Rover specialist. They have the proper tools (like a pressure tester and boroscope) and expertise to accurately diagnose and repair the issue.
    • Before a Long Trip: Ensure your cooling system is in top condition before any extended travel.

Don't ignore this warning. A small leak can quickly become a major problem.

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