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Coolant Leak on my 2020 Audi Q7 3.0T - Is it the Water Pump?

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Eric V. · rep 0 · May 22, 4:31 AM · 1 replies · solved · Question

Vehicle: 2020 Audi Q7 3.0T Prestige

Hi all,

I've been noticing a sweet smell coming from my 2020 Audi Q7 3.0T, especially after driving. I checked under the hood and saw that my coolant reservoir was a bit low. Yesterday, I even found a small greenish puddle under the front of the car after it had been parked overnight.

I'm worried it might be the water pump, as I've heard these can be a common failure point on the 3.0T engines. My Q7 only has about 45,000 miles on it, so I'm a bit surprised if it's already failing.

Has anyone else with a 2020 Q7 or similar 3.0T engine experienced coolant leaks at this mileage? What was the culprit, and what kind of repair costs should I expect?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:31 AM

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ClearTheCode admin answer:

It sounds like you're dealing with a coolant leak, and your suspicion about the water pump or thermostat housing on your 2020 Audi Q7 3.0T is well-founded. These components are indeed common failure points for the Audi 3.0T (EA837) engine, even at relatively low mileage.

  1. Common Causes of Coolant Leaks:

    • Water Pump Failure: The mechanical water pump, often integrated with the thermostat housing, can develop leaks. The plastic components and seals within these units can degrade over time due to heat cycles and pressure, leading to cracks or seal failures.
    • Thermostat Housing: The housing itself, often made of plastic, can crack or warp, causing coolant to seep out. Sometimes, the issue is specifically with the thermostat's internal components failing, but the leak often originates from the housing or its connection points.
    • Hoses and Connections: Less common but still possible, a loose clamp or a cracked hose could be the source.

  2. Symptoms and Diagnostics:

    • Sweet Smell: This is a classic sign of ethylene glycol-based coolant leaking and evaporating.
    • Low Coolant Level: The reservoir will show a drop, requiring frequent top-offs.
    • Puddles: Greenish or pinkish (depending on coolant type) puddles under the car.
    • Overheating (Severe Cases): If the leak is significant, it can lead to engine overheating, which is very dangerous for the engine.
    • OBD Codes: While not always immediate for a slow leak, a failing thermostat or significant coolant loss can trigger codes like:
      • P2181: Performance problem in cooling system
      • P0128: Coolant thermostat (coolant temperature below regulating temperature)

  3. When to See a Shop:

    • Promptly: Any coolant leak should be addressed quickly. Low coolant levels can lead to engine overheating, which can cause severe and expensive damage (e.g., head gasket failure, warped cylinder heads). Do not ignore a persistent leak.
    • What to Expect: A technician will perform a pressure test on the cooling system to pinpoint the exact source of the leak. They will visually inspect the water pump, thermostat housing, and all hoses. Replacement of the water pump and/or thermostat housing is a common repair for this engine and can be labor-intensive due to their location. It's advisable to use genuine Audi parts for these critical components.
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