Most folk will say don't change original water pump, but you need to know its the original one and someone hasn't already changed it for a cheapie.
I've seen them do over 300k on a stock water pump, and as long as the right coolant has been in there and changed every 3 to 5 years, they are reliable.
However, some garages won't warranty their cam belt work unless they can change the pump as well, so insist on blue box parts if you do, though SKF/FAG/continental and gates are usually the ones who actually make the belts for volvo
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