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My S5 only likes to be just above Min when cold as when hot, it is at Max. So when at Max when cold, when it gets hot, it just squirts it out through the tank cap. I even bought a new cap as it didn't look like the coolant got to a proper pressure. The pressure keeps the coolant level down.
I don't understand why ours would be different. Following the recall work I got into the habit of checking my levels in case the dealer tech had left a leak. No leak and now I have a clear pencil mark where the cold level is, and the hot level is at max. I'd need to check but I think that pencil mark is about 1/3 down from the max level.
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