CV bots or see this website it may help
http://www.ehow.com/how_2312843_correct-hard-steering-problem-.html
could be several places, power steering hose, rack and pinion (or steering gear box) or power steering pump.
For several years of the Chevy astro van had a power brake and power steering system that was linked together. Instead of a brake booster, the power steering pump provides power to the power brake system. Often, if the brake pedal would become hard to push, it is a power steering pump problem. Change the power steering pump and the power steering fluid and your problem may disappear.
Could be a broken Power Steering belt or low fluid level or power steering pump failure.
check the power steering fluid level and the power steering belt
Its a good bet that the power steering fluid is low. If not, the power steering pump may be at fault, a line blocked or the steering box could be worn out.
You either need power streering fluid or a power steering belt.
Most times, if it is hard to steer, there is a need for power steering fluid. If that is not the case the power steering pump itself might be going out. It would be best to take it and have it looked at before it gives anymore trouble.
Power steering pump failing.
Bad steering pump, low or no power steering fluid, binding in steering components such as the u-joints in the steering column, tie rods, or Pitman arm.
Power steering belt slipping? Power steering pump bad? Steering rack worn? Suspension parts worn?
Hard power steering means there is little to no fluid left in the system. The power steering system should be flushed and checked for leaks.
power steering is easier and you do not have to turn the wheel as hard as manually.