AQ against ultra passive

Im posting this for no other reason but that I would like to know if I took the correct line. Villan is 85/3 over 60 hands. Also, how am I suppose to put a player like this on a range?

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

Button ($66.90)
Hero ($71)
BB ($76.20)
UTG ($50.95)
MP ($54)
CO ($58.40)

Preflop: Hero is SB with http://www.flopturnriver.com/phpBB2/.../smiles/qs.gif, http://www.flopturnriver.com/phpBB2/.../smiles/ad.gif.
2 folds, CO calls $0.50, 1 fold, Hero raises to $2.5, 1 fold, CO calls $2.

Flop: ($5.50) http://www.flopturnriver.com/phpBB2/.../smiles/5d.gif, http://www.flopturnriver.com/phpBB2/.../smiles/9c.gif, http://www.flopturnriver.com/phpBB2/.../smiles/3d.gif (2 players)
Hero bets $4, CO calls $4.

Turn: ($13.50) http://www.flopturnriver.com/phpBB2/.../smiles/qc.gif (2 players)
Hero bets $12, CO calls $12.

River: ($37.50) http://www.flopturnriver.com/phpBB2/.../smiles/4h.gif (2 players)
Hero bets $16, CO calls $16.

Final Pot: $69.50

I play it the same.

dont put him on a range, just make a hand and value bet the hell out of it. figure the range is extremely wide, he calls w/ any pr, any gutshot, any straight/flush draw...sometimes hes gonna get lucky and catch a random 2pr or trips or whatever, but dont worry about that he'll be giving it back eventually. only time u should be worried about a player like this is when he is betting into you, and betting into you HARD. if he just keeps calling you, always assume you are ahead.