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have you been able to verify if it is antifreeze or just pure water?
then this is your heater core that is leaking. and will need to be replaced. this is a pretty invasive job and I would not recommend taking on this task on your own.
yes if it was clean water then I woukd say you probably have a plugged condensation drain line but if you smell anhint of antifreeze and the leak is inside the vehicle then it is 100% the core.
you hae remove the entire dashboard assembly from the vehicle
I will correct myself other Volvos require the removal of the dashboard however this one is lot less invasive in that regard but does require service to the airbag system. I can upload the instructions here if you would like and you can decided for yourself if this is something you wish to attempt.
different things can cause failures. sometimes the seals just were out other times there is a t of electrolysis going on. and cold temps can cause it if there is not enough antifreeze mixed into the water.
tt is reall your call I do not know you level of experience on working on cars it is not a difficult task but for some it may be.
not a problem if you have a moment to leave a rating it would be appreciatd.