A8 / S8 (D5 Platform) Discussion Discussion Forum for the D5 Audi A8 Produced from 2017-Present

Low Coolant?

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Old Today | 06:15 AM
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subterFUSE's Avatar
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Default Low Coolant?

Just had my S8 service on 5/22/26, last one before I turn in the lease in September.

Yesterday, I pull out of the driveway and only 30 yards from home I get a Low Coolant warning. I turn around and park in the driveway, and check my coolant level. It's very far below the line on the expansion tank. I keep a bottle of G12 Evo in the garage, so I top off the coolant level. It took more than half a gallon to get half way between the Low and High fill lines. Checked my floor, no leaks evidence. Where did that much coolant go in a month?
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Old Today | 06:45 AM
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It must have gone somewhere. Keep an eye on it. It may have a tiny leak around the water pump that you would not necessarily see signs of it.
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