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2016 Mini Cooper S Low Coolant Warning and Sweet Smell

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Mike T. · rep 0 · May 25, 5:00 AM · 1 replies · solved · Question

Vehicle: 2016 Mini Cooper S

My 2016 Mini Cooper S (F56) with about 70,000 miles just popped up a low coolant warning on the dashboard. I've also noticed a slight sweet smell, especially after driving and parking the car.

Sometimes, there's a small, damp spot under the front end, but it's not always consistent. I'm hoping it's something I can check or fix myself without a costly trip to the dealership. Is this a common issue for this generation of Mini, and what are the usual culprits I should investigate first?

I'm comfortable with basic DIY, but I want to make sure I'm looking in the right places.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:00 AM

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ClearTheCode admin answer:

Low coolant warnings and a sweet smell often indicate a leak in the cooling system, which is a relatively common issue in many vehicles, including the Mini Cooper S. Addressing this promptly is crucial to prevent overheating.

Here's a step-by-step guide to diagnose and address the issue:

  1. Safety First: Ensure the engine is completely cool before opening the coolant reservoir cap to avoid scalding from hot coolant or steam.
  2. Inspect the Coolant Reservoir: Check the coolant level in the expansion tank. If it's low, top it off with the correct Mini-approved coolant (typically a blue or green OAT/HOAT formulation, check your owner's manual).
  3. Visual Inspection for Leaks: With a flashlight, carefully inspect the following common leak points:
    • Thermostat Housing: This plastic component is known to crack or develop leaks over time. Look for crusty coolant residue around it.
    • Water Pump: Often located on the side of the engine, look for drips or residue underneath it.
    • Radiator Hoses: Check all rubber hoses connected to the radiator, engine, and heater core for cracks, bulges, or loose clamps.
    • Radiator: Inspect the front of the radiator for any visible damage or wet spots.
    • Expansion Tank: The plastic tank itself can sometimes develop hairline cracks.
  4. Pressure Test (Recommended): If you can't find a visible leak, a cooling system pressure test can help. Many auto parts stores rent these tools. It involves pressurizing the system and watching for a drop in pressure or visible leaks.
  5. OBD Codes: While a leak won't directly trigger a specific leak code, a consistently low coolant level or a failing thermostat might trigger a P0128 (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)) if the engine struggles to reach operating temperature.

Common Causes:

  • Degradation of plastic components (thermostat housing, water pump housing).
  • Wear and tear on rubber hoses and seals.
  • Corrosion or damage to the radiator.

When to See a Shop:

  • If you cannot locate the source of the leak after a thorough inspection or pressure test.
  • If the leak is from a difficult-to-access component like the heater core or a major engine component.
  • If the engine is overheating, even after topping off coolant.
  • If you suspect a head gasket issue (unlikely for a simple leak, but possible if overheating is severe and prolonged).

Addressing a coolant leak quickly will prevent more severe engine damage.

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