The hydraulic pump that drives the steering and the cooling fan is mounted to the engine timing cover on the left front of the engine (since the engine is in the rear it is on the right rear). It is driven by the timing gears.
The most common cause for loss of pump function is a hydraulic fluid leak. Check the system fluid level (tank is in right rear service bay) and if it is low, refill it and locate and repair the leak. If the system is low enough on fluid to be inoperative, it does have a leak and needs repair.
Gerald