I have had, or rather my wife has, had a catastrophic failure of the top hose on a 1.8T. The hose could be torn as easily as peeling a banana!
And of course you should just fill with water until you know if the fault has been found! Then drain some and add antifreeze.
Other points where we have lost water on the 1.8T includes the water pump. It would leak while standing but be fine when driving! In neither case did the engine blow its head gasket, but we caught it early!
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Worth his V8 in gold
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