I'm not a Volvo expert, I did look in Vadis and only found the radiator drain cock. It's been years since I have seen one on engines though there may be, nothing was identified. It's not uncommon just to use the bottom radiator hose to finish draining the block. Essentially you want the lowest easiest fitting to access, if you are bent on flushing then a heater hose is most common to force water through the block and out the bottom radiator hose.
Hope that helps, if not ask questions.
Cheers,
GTM
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