in place of the existing one,assuming it is equipped with one
No. Put in power steering fluid.
The most obvious answer would be a broken hose which need to be checked.
pictures of where to put power steering fluid in a 1990 buick lesabre
Assuming you are putting it in the power steering, why not?
Power Steering Pump Reservoir.
As long as you can find the power steering pump brackets.
Into the power steering reservoir under the hood.
At the power steering reservoir.
where is the power steering pump located
Secure the power steering pump with the retaining bolts. Attach the power steering hose to the power steering pump. Put the belt on to the power steering pump. Fill the power steering system with fluid.
How about in the power steering pump.......