The steering rack may fail causing the steering to become hard to turn.Google+
Car Problem Reports
Buick Century Steering rack can fail
Buick Century Problem
Average Mileage: 163,625 mi (115,500 mi - 240,000 mi)
Visitor, 1994 Buick Century, 119,000 mi
hard to turn power steering wheel...replacing the pump may help and is cheaper to replace.
Visitor, 1998 Buick Century, 180,000 mi
I have about a half of a wheel of play in the steering wheel and leaking power steering fluid. And the most noticeable issue is its very hard to turn left. My bro is a certified mechanic and he diagnosed the problem as I need to replace the rack and pinion asap. It's very dangerous to drive it this way. The steering could lock up or I could lose control trying maneuver around curves. Also instructed to keep a check on fluid level until I get the problem fixed. I have the parts ordered and will be fixed by end of the week.
Visitor, 1998 Buick Century, 240,000 mi
10,000 miles and one year ago I replaced rods. Now, very very hard to turn left. next, new(online) sterring rack.