With the hood raised and looking at the driver's side of the engine compartment, the top pulley closest to the fender is the A/C compressor (if you have A/C). The PS pump is below it and the hose leads out from that. To see it clearly, you may need to remove the skid plate underneath/ Remember, safety first. Park brake and wheel chocks. You don't want that run down feeling.
Power steering pressure switch.Power steering pressure switch.
Have you checked the power steering pressure line?
It does not have one.
On the 4.0 L OHV engine, the oil pressure sending unit is on the driver's side of the engine, located below the power steering pump.
The power steering pump is located on the driver side lower part of the engine. It's a triangle shape. http://cgi.ebay.com/ebaymotors/2001-FORD-EXPEDITION-POWER-STEERING-PUMP_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem260344402595QQitemZ260344402595QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
The power steering pump provides the pressure for the steering and brakes. Check the p.s. fluid.
It is in the pressure line just behind the pump.
next to the power steering tank.
It located on the steering pump.Check link below: http://www.youtube.com/watch?v=eVNkBejm_Go
With the engine off, remove the power steering reservoir cap, and read the fluid level.
passenger side under the alternator
its located behind the power steering pump...you would have to remove the power steering pump to access it