Cant ster my car

You did not say what the make model and year is, and I'm not sure I followed your story.
Did you take the pressure hose off and check for a blockage in the hose ?

You might want to check the power steering fluid. The resevoir is on the passenger side toward the passenger seat it is kind of hard to find. But i have a '97 Grand Prix and i noticed that whenever i would turn sharp while going pretty fast it would make a grinding noise and i could feel my steering wheel pulling me. But the thing is the power steering never whinned or anything. So i checked it and there was absolutely none in there. So check the fluids first.

Turn and hold sterring wheel to release pressure and then turn key.

your power steering pump has a cap on it.you have cold mark and hot mark.when car is cold engine not running.when you remove power steering cap it should be on cold mark.if not add until you get to cold mark on cap stick..dont over fill or you blow the seal.now when engine is hot been running.turn off car check.power steering cap should read full hot.mean level is correct.when you first check power steering fluid and it was real real low.you got a leaking high pressure hose.or power steering pump seal is leaking.if all check out good.your problem could be low tire pressure.worn ball joints.and tie rod ends.rack and pinion steering gear binding.

how it seems that your rack and pinion is going out making the vehicle very hard to steer. first i would check your fluid and make sure that it's full and make sure it's not over full if it's over full the unit will mess up.

The power steering pump/reservoir is down below the pass. side of the engine, right up against the firewall. Will have to reach down between firewall and 2 heater hoses to get to the cap.-

You need to replace the rack and pinion.

if you have to keep adding fluid it hasto be leaking it somewhere.
Have someone work the steering whell back and forth going all the way and make it work a little each way meaning turn it right all the way till it won't turn an hold it so it winse and the same way the other way.The leak should show up

change the power stering fluid and check the belt i had the same thang happen to me if that doint help u need a new pump

Sorry I got a 2001 530 i .
My problem is ,the car has vibration around 80 to 120 km.
So i will like to know if the stering box can do that?