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Coolant Disappearing on 2018 Range Rover Sport V6 Supercharged

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Chris P. · rep 0 · May 22, 6:28 AM · 1 replies · solved · Question

Vehicle: 2018 Range Rover Sport HSE

Hey everyone,

I've got a 2018 Range Rover Sport HSE with the 3.0L V6 Supercharged engine, and I've noticed my coolant level dropping pretty consistently over the last few weeks. I get the 'Low Coolant' warning on the dash every few days, and I have to top it off.

I've checked under the car for puddles, but there's nothing obvious on the garage floor. I can sometimes smell a faint sweet odor when the engine is warm, especially after a drive. The temperature gauge seems normal, but I'm worried about potential overheating or bigger issues down the line.

Has anyone experienced this with their 2018 Range Rover Sport or similar models? Any common culprits I should be looking for before I take it to the dealer? I'm hoping it's something relatively simple to diagnose.

✓ 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 on the 3.0L V6 Supercharged engines in Land Rover models, including your 2018 Range Rover Sport. A disappearing coolant level without obvious puddles often points to a slow leak from specific components.

Here's what you should investigate:

  1. Inspect Common Leak Points:

    • Water Pump: This is a very frequent failure point. Look for coolant residue or staining around the pump housing, often on the front of the engine.
    • Coolant Crossover Pipe (Rear of Supercharger): This plastic pipe, located under the supercharger at the back of the engine, is notorious for cracking and leaking. The leak often drips down the back of the engine, making it hard to spot on the ground.
    • Thermostat Housing: Another plastic component prone to cracking and leaking.
    • Hoses and Connections: Check all coolant hoses, especially where they connect to components, for signs of swelling, cracking, or residue.

  2. Pressure Test: A professional shop can perform a cooling system pressure test. This involves pressurizing the system when the engine is cold, which can often reveal leaks that only appear under pressure, making them easier to locate.

  3. UV Dye: If the leak is still elusive, a UV dye can be added to the coolant. After driving for a bit, a UV light can then be used to pinpoint the exact source of the leak, as the dye will glow brightly.

  4. Check for Internal Leaks: While less common for this specific symptom, a head gasket leak could also cause coolant loss. However, this usually comes with other symptoms like white smoke from the exhaust, oil in coolant, or coolant in oil. Given your description, external leaks are more probable.

When to See a Shop: You should definitely take your vehicle to a qualified Land Rover specialist or a reputable independent shop as soon as possible. Continuing to drive with a low coolant level, even if the temperature gauge seems normal, can lead to serious engine damage, including overheating and potential engine failure. Addressing this proactively will save you significant repair costs in the long run. Ensure they use the correct Land Rover-approved coolant during any repairs.

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