Failed water pump seal, any dried coolant crystals?
Our D5 XC90 did the same for ages. It was only when we did a timing belt service that we found dried coolant crystals covering everything. It's really easy to pull the black plastic timing cover off to check, it's a single 10mm bolt and a handful of clips. Since you're in there check all of the tensioners and pulleys for dried bearings including the alternator pulley. Ours had a dried bearing on the plastic timing pulley. It sounded like a high pitched whistling sound, like a boost leak, but changed pitch with the RPM.
Amazon had the Aisin water pump for £45 a little while ago. It was identical to the genuine Volvo part we took off only the Volvo markings had been ground off. Hope you sort it soon.
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