1990 Renault 5 Power Steering problem

Steering problem
1990 Renault 5 Automatic 37950 miles

The power steering on my Renault became very heavy yesterday and was making a very loud creeking noise. I topped up the fluid but this made no difference. When the wheel is fully turned to the left/right its sticks and requires quite al ot of force to get back. Sounds as if the wheel is catching inside the car rather than under the bonnett.