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Coolant disappearing on my 2017 A3 2.0T - suspecting water pump or thermostat housing

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Mike T. · rep 0 · May 26, 3:51 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A3 2.0T Premium Plus

Hey everyone,

I've been noticing a steady drop in my coolant level over the past few weeks on my 2017 Audi A3 2.0T Premium Plus. There's no obvious puddle under the car, but I can sometimes smell a faint sweet odor, especially after driving. I've had to top it off twice already.

I'm worried it might be the notorious water pump issue these engines are known for. Has anyone else experienced this with their A3? I'm trying to figure out if it's something I can diagnose myself before taking it to the dealer.

Could it be a cracked thermostat housing, or is the water pump the more likely culprit? Any tips on what to look for or common leak points would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:51 AM

0

ClearTheCode admin answer:

It sounds like you're experiencing a common issue with the EA888 engine found in your 2017 Audi A3, where coolant leaks are often attributed to the water pump assembly or thermostat housing. Here’s what you should consider:

  1. Visual Inspection: Start by carefully inspecting the area around the water pump, which is typically located on the passenger side of the engine. Look for pink or white crusty residue, which is dried coolant. Also, check hoses and hose clamps for any signs of leaks or deterioration.
  2. Pressure Test: If a visual inspection doesn't reveal anything obvious, a cooling system pressure test can help pinpoint the leak. Many auto parts stores rent these tools, or a trusted independent shop can perform one.
  3. Common Causes:
    • Water Pump Failure: The plastic components within the water pump assembly can become brittle and crack over time, leading to leaks. The seals can also fail.
    • Thermostat Housing: Similar to the water pump, the plastic thermostat housing is prone to cracking and leaking.
    • Hose Leaks: Less common, but sometimes a loose or cracked hose can be the source.
  4. OBD Codes: While a coolant leak might not always trigger an immediate Check Engine Light (CEL), if the coolant level drops significantly, or if the engine struggles to maintain optimal temperature, you might see codes like P2181 (Cooling System Performance).

When to See a Shop: It's highly recommended to see a professional shop as soon as possible. Coolant leaks, if ignored, can lead to engine overheating and severe engine damage. A professional can accurately diagnose the source of the leak, which often requires specialized tools and knowledge of the specific engine design. Given the complexity of replacing the water pump or thermostat on these engines, it's generally not a DIY job for most owners.

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