I have no experience of the make of car to which you refer but the same rules should apply. Power Steering designed to assist in tight parking is dangerous at speed. The system should have a feature whereby the higher the revs. the less assistance from the power steering pump. If not you could be driving North on the Free-way,suddenly you sneeze, 2 seconds later you are creating carnage in the South bound lanes. I urge you to take your car to a specialist.
Into the power steering reservoir.
At the front of the engine , towards the drivers side of the engine ( power steering fluid reservoir on a 1998 Mercury Grand Marquis )
It is part of the power steering pump assembly.
Yes there Is under the dashboard
On a 2008 Grand Marquis, the power steering reservoir is located on the driver's side of the engine compartment, near the front. It is typically mounted on the engine, close to the power steering pump. The reservoir is usually a small, translucent container with a cap labeled "Power Steering." You can check the fluid level through the side of the reservoir.
Ford calls for Mercon ATF.
I was looking at a picture in the 2003 Mercury Grand Marquis Owner Guide and it shows the power steering fluid reservoir at the front of the engine compartment between the engine coolant reservoir and the engine air filter box
My 1997 Grand Marque steering is binding when making a turn. Power Steering Fluid is FULLL.and system isn;t leaking.
You should first check the power steering fluid to see that it has some, if not, fill it up and see if that works.
It is on the back of the power steering pump. The power steering pump is located on the left hand side of the engine. It will be a cap with the dipstick molded on to it. Remove the cap and you will be able to see the fluid.
The oil filter is on the driver side of the engine next to and below the power steering pump.
To replace the power steering pump on a 2004 Mercury Grand Marquis, start by disconnecting the negative battery cable and draining the power steering fluid. Remove the serpentine belt by loosening the tensioner, then detach the pump's inlet and outlet hoses, and unbolt the pump from the bracket. Install the new pump by reversing these steps, ensuring all connections are secure, and refill the power steering fluid before testing the system.