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2017 A6 3.0T Coolant Leak & Low Coolant Warning - Water Pump?

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David L. · rep 0 · May 25, 3:15 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A6 3.0T Competition

Hello everyone, I own a 2017 Audi A6 3.0T Competition with about 85,000 miles. Lately, I've been getting the 'Low Coolant' warning light on my dashboard more frequently. I've had to top off the reservoir a couple of times in the last month. I also noticed a faint sweet smell after driving and sometimes a small puddle under the front of the car, usually on the passenger side.

I've looked around with a flashlight, and it seems like there might be some crusty pink residue near the water pump area, which I know is a common failure point on these 3.0T engines. I haven't seen any overheating yet, but I'm worried it's only a matter of time.

Has anyone else experienced this with their C7 A6? Is this definitely a failing water pump, or could it be something else like a hose? What's involved in replacing it, and is it a DIY job for someone with some experience?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:15 AM

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ClearTheCode admin answer:

Your description of a persistent low coolant warning, sweet smell, puddles, and pink crusty residue near the water pump on your 2017 Audi A6 3.0T strongly points to a failing water pump. This is an extremely common issue for the supercharged 3.0T (EA837) engine, especially as vehicles approach or exceed 80,000 miles.

Causes of Water Pump Failure:

  1. Plastic Components: The original water pumps often feature plastic impellers and housings that can degrade and crack over time due to heat cycling and coolant exposure.
  2. Bearing Wear: The internal bearings can wear out, leading to shaft play and eventual seal failure.
  3. Thermostat Housing Issues: The thermostat is often integrated or closely associated with the water pump on these engines, and its housing can also develop leaks.

Recommended Steps:

  1. Visual Confirmation: Carefully inspect the area around the water pump, thermostat housing, and associated hoses. Look for active drips, coolant stains, or dried pink/white residue. A small mirror and flashlight can help reach tight spots. Check coolant hoses for cracks or swelling.
  2. Pressure Test: A cooling system pressure test can help pinpoint the exact source of the leak. A shop can perform this, or you can rent a kit.
  3. Replacement: If the water pump is confirmed as the culprit, it needs to be replaced. This is a significant DIY job for an experienced mechanic, as it requires removing the supercharger and various intake components to access the pump. It's crucial to replace not only the water pump but also the thermostat and possibly the crossover pipe, as these are often compromised or fail soon after.
    • Parts: Use a high-quality OEM or upgraded aftermarket water pump (some have metal impellers). Don't forget new gaskets, O-rings, and fresh G13 or G12evo coolant.
    • Bleeding: Proper bleeding of the cooling system after replacement is critical to prevent air pockets, which can lead to overheating.

When to See a Shop:

  • If you're not comfortable with complex engine work, as this job involves significant disassembly and reassembly, proper torque specifications, and specialized tools.
  • If the leak is severe, causing rapid coolant loss or any signs of engine overheating (temperature gauge rising above normal, steam from under the hood). Continuing to drive with a significant leak risks catastrophic engine damage.
  • If you suspect other components like the oil cooler or heater core, which might require more advanced diagnostics.
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