How do you replace the power steering pump on a 2004 Mercury Grand Marquis?

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.