My V40 just had its 3 month check-over at the dealer. They replaced the hose as per the recall (I didn't even know there was a recall).
They explained it was stop water sitting in the pipe and freezing. That kind of suggests there was oringinally a none return valve fitted.
On motor talk there's a long discussion about the freezing water on the hose (probably beacause of the "polar" temperatures in Germany the problem is more wide than in other countries).
I got a letter from Volvo yesterday, regarding the issue. Haven't noticed the problem, even though the temperature have been below 0C almost since christmas.
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