Water pump needs changing if when inspected it's noisy or leaking etc. My V70 got to 300,000 miles and had had 5 cambelts, but was still on the original water pump. Our S70 is on it's third cambelt, but at 170,000 miles, still has the original water pump.
On some cars - anything with the GM 1.9TiD engine for example, so Vectras, Astras, Saab 93 and 95, Fiats, Alfas etc, the water pump is a known issue and should be changed every time, but as far as I'm aware this isn't the case with the Volvo.
The aux belt - in effect the fan belt you can actually see at the front end of the engine - has to come off anyway, and might as well be replaced.
It's possible that your car previously didn't need a water pump, but on the other hand arguably the garage was being prudent and careful.
Water pumps do fail and the results can be catastrophic, doing serious and even terminal damage.
Cheers
Jack
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