Volvo Forums - Volvo Enthusiasts Forum - How to check AWD systems and problems with them?

Unfortunately the 2000 S80 which I fixed up was just totaled in an ice storm. My wife insists I buy another Volovo for my son due to the safety features it has.

I want to look at a 2004 S80 AWD 2.5T (164K miles). My only experience with AWD systems is in my Wife’s Explorer and Yukon.

Can anyone please tell me what problems to look for while test driving an AWD Volvo?

Is the Volvo AWD systems in the S80 or S60's prone to problems and what are they?

I am not hooked on buying an AWD but the price seams right for this particular vehicle.
Thank you