Location where the power steering pump iis - 2003 Ford Explorer

Are you sure the problem is not the water pump?

It appears it is under the AC Compressor. Both appear to share a belf for their repsective pumping activities. It should be possible to locate by tracing the hoses from the Power Steering Fluid resevoir (where you add fluid) to the devices behind pullies under the the air filtration system
Perhaps this link will be helpful
Repair Guides Power Steering Pump Removal Installation AutoZone com

Mr. White,for the Power Steering starting winning four things are happening. 1. not having Power steering fluid enough in the fluid can, Check it. 2. The Pressure and one way valve either is seized, blocked from any dirt, 3. The Power steering pump itself worn inside ( blades worn) or 4.any Dirt ( mud ) built up inside if the fluid never changed and makes narrow flow of fluid and dropped the flow pressure.

POWER STEERING PUMP IS BELT DRIVEN PUMP LOCATED NEAR TOP ENGINE.LOOK FOR PUMP THAT HAS A RESERVOIR AND A CAP THAT READS POWER STEERING FLUID ONLY ALSO POWER STEERING PUMP HAS TWO POWER STEERING HOSE CONNECT TO RACK AND PINION.

Section 11-02A: Steering Pump, Power, C-II 1996 Aerostar, Ranger and Explorer Vehicles Workshop Manual REMOVAL AND INSTALLATION Pump and Pulley SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number Steering Pump Pulley Remover T69L-10300-B Steering Pump Pulley Replacer T65P-3A733-C
Removal

1. Disconnect the power steering return hose (3A713) at the pump and drain fluid.
   

1. Remove the power steering pressure hose (3A719) by unscrewing connector from the pump.
   

1. On the Aerostar 3.0L V-6 engine (6007), loosen the drive belt tensioner (6B209) and adjustment bolts.
   
   
   
   
   
   Item Part Number Description 1 10346 Generator 2 8501 Water Pump 3 8678 Belt Idler Pulley 4 3A733 Power Steering Pump Pulley 5 6303 Crankshaft 6 2884 A/C Clutch 7 — Without A/C On the 2.3L I-4 and 4.0L V-6 engines, slacken belt tension by lifting drive belt tensioner in a counterclockwise direction. On Ranger 3.0L V-6 engines, slacken belt tension by lifting drive belt tensioner in a clockwise direction. Remove drive belt (8620) from under drive belt tensioner and slowly lower pulley to stop. Remove the drive belt from the power steering pump pulley (3A733).
   
   
   
   
   
   Item Part Number Description 1 10346 Generator 2 2884 A/C Clutch 3 3A733 Power Steering Pump Pulley 4 8501 Water Pump 5 6303 Crankshaft 6 8678 Belt Idler Pulley 7 6B209 Drive Belt Tensioner

1. NOTE: If the drive belt requires servicing, refer to Section 03-05 .
   
   Remove the drive belt from the power steering pump pulley.
   

1. Remove the oil dipstick tube.
   

1. Remove the power steering pump support (3C511).
   

1. Install Steering Pump Pulley Remover T69L-10300-B on the pulley.
   

1. NOTE: Do not apply pressure on the power steering pump rotor shaft (3B559). Pressure will damage internal thrust areas of the power steering pump (3A674).
   
   While holding the remover tool nut stationary with a wrench, rotate the inner spindle of the remover tool clockwise until the pulley is pulled off the power steering pump rotor shaft.
   

1. Remove the bolts attaching the power steering pump to the A/C compressor mounting bracket (2882).
   

Installation

1. Install the power steering pump on the A/C compressor mounting bracket. Install and tighten attaching bolts to 41-61 Nm (30-45 lb-ft). On 4.0L engine, tighten to 47-64 Nm (35-47 lb-ft).
   

1. Position the support on the A/C compressor mounting bracket. Install mounting bolts and tighten to 47-64 Nm (35-47 lb-ft).
   

1. NOTE: Fore/aft location of power steering pump pulley on power steering pump rotor shaft is critical. Incorrect belt alignment may cause drive belt squeal or chirp. Make sure pull-off groove on power steering pump pulley is facing front and flush with end of shaft ± 0.254mm (± 0.010 inch).
   
   Install the Steering Pump Pulley Replacer T65P-3A733-C and install the power steering pump pulley.
   

1. Install the drive belt on the power steering pump pulley.
   

1. On the 2.3L I-4, Ranger 3.0L V-6, and 4.0L V-6 engines, position and rotate drive belt on engine. While lifting drive belt tensioner in a counterclockwise direction (clockwise on Ranger 3.0L V-6), slide drive belt under drive belt tensioner and lower drive belt tensioner to drive belt.
   On Aerostar 3.0L V-6 engine, position the belt idler pulley (8678) assembly to give the drive belt the tension specified. Refer to belt tension check in Section 03-05 . Tighten the drive belt tensioner and adjustment bolts to 47-64 Nm (35-47 lb-ft).
   

1. Install the power steering pump support, if removed.
   

1. Install the oil dipstick tube.
   

1. Install the pressure hose tube nut and new Teflon® wagner into power steering pump valve outlet fitting (3D654) and tighten to 41-54 Nm (30-40 lb-ft).
   

1. Connect the power steering return hose to the power steering pump, and reposition the clamp.
   

1. Fill the power steering oil reservoir (3A697) with Premium Power Steering Fluid E6AZ-19582-AA or equivalent fluid meeting specification ESW-M2C33-F. Start the engine and turn the steering wheel (3600) from left to right without hitting stops to remove air from the system.
   

1. Check for leaks and recheck the fluid level. Add fluid if necessary to proper level as specified in Section 11-00 .
   
   
   Power Steering Pump and Power Steering Pulley, 2.3L TPH Engine, Ranger Only
   
   
   
   
   
   Item Part Number Description 1 2882 A/C Compressor Mounting Bracket 2 N606543-S2 Bolt (2 Req'd) 3 N606069-S2 Bolt (2 Req'd) 4 N605803-S2 Bolt 5 N800199-S8M Screw 6 3D673 Power Steering Pump Pulley 7 3F671 Power Steering Belt Idler Support 8 N806020-S2 Bolt 9 3A674 Power Steering Pump 10 19703 A/C Compressor A — Tighten to 21.2-29 Nm (16-21 Lb-Ft) B — Tighten to 40.3-55 Nm (30-41 Lb-Ft) C — Tighten to 44-51 Nm
   (32-38 Lb-Ft)
   
   Power Steering Pump and Power Steering Pulley, 3.0L Engine, Aerostar
   
   
   
   
   
   Item Part Number Description 1 3A674 Power Steering Pump 2 3C511 Power Steering Pump Support 3 6007 Engine 4 N803564 Stud 5 N802827-S2 Nut 6 N800199-S8M Screw (3 Req'd) 7 N8011179-S2 Screw (3 Req'd) 8

Depending on your engine will make a difference
Just follow the power steering lines that come from the steering rack & pinion to the pump

Power steering pump special tools


Power Steering Pump Removal & Installation Power Steering Pump (2V) To Remove:

1. Before servicing the vehicle refer to the precautions at the beginning of this section.
2. Disconnect the battery ground cable.
3. Remove the accessory drive belt.
4. Remove the alternator.
5. Drain and remove the radiator coolant recovery reservoir.
6. Position a drain pan under the power steering pump underneath the vehicle. Disconnect the hydraulic pressure and return lines and allow to drain.
7. Remove the idler pulley from the power steering pump support.
8. Remove the belt tensioner.
9. Remove the bracket mounting bolt located under the belt tensioner mounting.
10. Remove two retaining nuts from the bracket mounting studs. Remove both mounting studs, and pull off the power steering pump support with the pump attached.
11. Clamp the pump support bracket in a suitable vise.
12. Remove the power steering pump pulley from the pump shaft using Pump Pulley Remover T69L-10300-B, or equivalent. Remove the three bolts retaining the power steering pump to the power steering pump support and remove the power steering pump.

To Install:
NOTE: The pulley must be installed within 0.010 in (0.25 mm) flush with the power steering pump shaft.

1. Install the power steering pump to the power steering pump support. Tighten the mounting bolts to 18 ft-lb. (25 Nm).
2. Install the power steering pump pulley using Steering Pump Pulley Replacer T65P-3A733-C, or equivalent; the pulley face must be flush within 0.010 inch (0.25mm) of the pump shaft.
3. Install the power steering pump/pump support and torque nuts/bolt to 24 ft. lbs. (33 Nm).
4. Install the bracket mounting bolt located under the belt tensioner mounting.
5. Install the belt tensioner.
6. Install the idler pulley to the power steering pump support.
7. Connect the hydraulic pressure and return lines.
8. Install the radiator coolant recovery reservoir.
9. Install the alternator.
10. Install the accessory drive belt.
11. Fill the power steering reservoir with power steering fluid.
12. Connect the battery ground cable.
13. Run the engine and check for leaks and proper operation. Bleed the power steering system if needed.

check the fluid level is the power steering reservoir.

Usually they are located near or part of the power steering reservoir. Look for the cap to fill the power steering with fluid the pump should be underneath.

You should add it to the power steering pump reservoir, which if you have the 3800 series II its behind the engine on the passenger side.