I did just what Klaus said on the 97 when I bought it a couple years back. WP was fine, still is, tensioner was the black pull the pin hand grenade type, slowly compress it in a vise, giving is a turn every minute or so, while you do something else. What my car needed and unless the owner was on the job this will need the PCV serviced. I just bit the bullet and got the whole kit, it solved the dip stick smoking and oil leaking. Good luck.

70K intervals. Belt and rollers, tensioner should be good if it is the pnumatic shock type (black). Water pump bearings should be checked - just rotated by hand and feel for any slop or vibration.
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My back feels better when I sit in a Volvo seat