How do you replace a power steering pump on a 99 gmc suburban?

To replace the Power Steering pump on a 1999 GMC Suburban, start by disconnecting the negative battery cable. Remove the belt from the pump, then disconnect the fluid lines and the pump mounting bolts. Install the new pump by reversing the process: attach it to the mounting bracket, connect the fluid lines, and re-install the belt. Finally, refill the power steering fluid and bleed the system as needed to remove any air.