Help! about steering

[suspectu1]

hey dudes!i'm new, i drive a 1992 240sx SUPER HICAS and i'm from Montreal, Quebeci have a problem with the steering on my car... it makes a *clunk* noise every time i turn the steering wheel to the max on either sides and then even after i get the car going in a straight line, i pulls on one side or another... ex: i get out of my driveway and i turn the wheel to the left, all the way, i hear the *clunk* sound (kinda like a rubber on metal) and i get on my way... in a straight line, the car pulls to the left.. get it?

ok, the second thing is related to the force i have to use to turn the steering wheel: i noticed that for the first 10 minutes of driving the car (let's say in the morning) the power steering works fine and the wheel turn smoothly (easily turnable with 1 hand)... after 10 minutes of driving it (by the time i get to school) the power steering seems to stop working and it's like driving a tractor... when i turn in my school's parking lot, i have to use both hands to move the wheel and it's still hard...

thank you very much for reading

[suspectu1]

no one?