Rich is right, sounds like thermostat - assuming there's even one in there!
If you buy from Volvo they will supply the right one for your car, don't worry.
Easy job, and you'll be getting much better fuel economy for having the engine run at the right temperature. Remember to check the coolant level after you've done the job and again after it's gone through a complete heat cycle, these tend to self-bleed but you will probably have to top it up again after it's "burped".
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