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Coolant Leak and Overheating in my 2017 Audi A6 3.0T - Suspect Water Pump

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Mike T. · rep 0 · May 25, 3:16 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A6 3.0T Prestige

Hello fellow Audi owners,

I've run into a concerning issue with my 2017 Audi A6 3.0T Prestige. Recently, I've noticed a sweet smell from the engine bay and a gradual drop in my coolant level. The low coolant warning light has come on a couple of times, and I even saw the temperature gauge creep up a bit higher than usual on a longer drive. I've topped it off, but it seems to be losing coolant steadily.

I've done some research, and it seems like water pump failures are quite common on these 3.0T engines. I haven't seen any puddles under the car, but there's some crusty residue around the front of the engine, near the accessory belt area.

Could this be the dreaded water pump issue? What are the typical signs, and what's the average cost for this repair? I'm worried about potential engine damage if I don't address this quickly. Any advice on what to look for or how to confirm the leak before I take it in?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:16 AM

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ClearTheCode admin answer:

David, your symptoms—a sweet smell, coolant loss, and rising temperatures—are classic indicators of a failing water pump, especially on the 3.0T supercharged engine found in your 2017 Audi A6. This is indeed a well-documented common failure point.

  1. Causes of Failure: The water pumps on these engines often fail due to:

    • Plastic Impeller Degradation: The plastic impellers can crack, break, or become loose over time, reducing their ability to circulate coolant.
    • Seal Failure: The internal seals can wear out, leading to external leaks, often visible as pinkish-white crusty residue (from dried coolant) around the pump housing or weep hole.
    • Bearing Failure: The pump's bearings can fail, causing noise (whining or grinding) and eventually leading to a complete seizure or leak.

  2. Common Symptoms:

    • Coolant Loss: The most obvious sign, often requiring frequent topping off.
    • Sweet Smell: The distinct odor of burning coolant, especially when the engine is hot.
    • Overheating: The engine temperature gauge rising above normal, or the low coolant warning light illuminating.
    • Visible Leaks/Residue: Pink, white, or green crusty deposits on engine components near the water pump, particularly on the front of the engine below the supercharger.
    • Check Engine Light: While not always directly related, persistent overheating or low coolant can trigger codes like P00B7 (Engine Coolant Flow Low/Performance) or P261A (Coolant Pump 'B' Control Circuit/Open) if the pump's sensor or function is compromised.

  3. Diagnosis: A visual inspection for leaks and residue is usually sufficient. A pressure test of the cooling system can confirm the leak point. The water pump on the 3.0T is located at the front of the engine, behind the supercharger, making it somewhat involved to access.

  4. Repair and Cost: Replacement involves removing the supercharger and other components. It's a labor-intensive job. While costs vary by region and shop, expect to pay anywhere from $1,200 to $2,000+ for parts and labor. It's highly recommended to use a genuine Audi or high-quality OEM replacement pump, and consider replacing the thermostat at the same time, as it's often accessed during the same job.

  5. When to See a Shop: Do not delay this repair. Continuing to drive with a leaking or failing water pump can lead to severe engine overheating, which can cause catastrophic damage to the cylinder heads, head gasket, or even the engine block. Get it to a reputable Audi specialist immediately.

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