Yes there Is under the dashboard
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.
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.
On a 2000 Mercury Grand Marquis : The fuse box is below and to the left of the steering wheel , by the brake pedal ( it has a cover on it ) Also , the Power Distribution Box ( which is " live " ) is located in the engine compartment
On a 1996 Mercury Grand Marquis : The fuse panel is under the dash , to the left of the steering wheel column ( it has a cover on it ) Also , the Power Distribution Box ( which is " live " ) is located in the engine compartment by the battery
Power assist steering and Power Steering are the same thing, just difrent names from difrent Manufacturers.