I have a 2005 ford expidition. The rear wiper arm

Open the rear window and push the arm past its usual position against the window. It may restore the the tension. However, You likely need a new wiper arm, you could also try lubricating the pivot point.

check your fuses

The wiper arm is spring loaded to hold tension against the glass. If the spring is bad you'll need to replace the wiper arm.

the ball joint may have snapped inside so the motor is no longer attached to the arm, has it been used in freezing conditions? often they snap this way, also the ball joint may have just popped off, you will ned to open it up, they are fairly straight forward so the problem would be obvious once open.

Regards
Dan

Front Wiper Motor Removal & Installation

NOTE A new wiper motor assembly comes with the linkage arm installed.

1. Before servicing the vehicle, refer to the Precautions Section.
2. Remove the windshield wiper mounting arm and pivot shaft
   WARNING Do not remove the wiper motor linkage arm from the wiper motor assembly. If the arm is removed, the wiper arms may not park in the correct location.
   NOTE Use a suitable tool to separate the wiper linkage arm from the wiper mounting arm and pivot shaft assembly.
   
3. Remove the 3 bolts and the wiper motor.
   
   
   
   Fig. Wiper motor and linkage
   

To install:

1. Install wiper motor and bolts.
2. Tighten wiper motor bolts to 10 ft. lbs. (13 Nm).
3. Install windshield wiper mounting arm and pivot shaft.
4. Check wiper operation.

Rear Wiper Motor - Removal & Installation

1. Remove the rear pivot arm.
2. Remove the rear wiper motor shaft nut cover
3. Remove the rear wiper motor shaft nut.
4. Open the lift gate window.
5. Remove the rear wiper motor cover trim panel.
6. Disconnect the electrical connector.
7. Remove the 2 rear window wiper motor nuts
8. Remove the rear window wiper motor.
   
   
   Fig. Rear wiper motor view-2008 model shown, other years similar
   

To install:

1. Install rear wiper motor and tighten mounting nuts to 62 inch lbs. (7 Nm).
2. Reconnect the electrical connector.
3. Install wiper motor cover trim panel.
4. Install rear wiper pivot arm tighten nut to 53 inch lbs. (6 Nm).
5. Install shaft nut cover.
   
6. Check wiper operation.

Good luck (remember rated this post).

I have a 2002. I thought this problem got fixed before 2005. I couldn't get my arm off because of internal corrosion. I took the wiper blade off to get a little more swing with the arm. I oiled and swung the arm to get it loosened up. Then I bent the arm towards the glass to get more spring pressure and reattached the blade. That will work for a little while. You can get a new arm from Autozone #42536 for $28 plus shipping.

no problem,
you need to find the base of the wiper arm where it connects to your window.lift up a plastic flip piece that covers a 13mm nut,loosen the nut just a little bit them move arm where the it should be"in the stop position".
and re-tighten nut tight.

Wiper Pivot Arm Removal and Installation

1. Lift the windshield wiper pivot arm to the full upright position.

1. Remove the windshield wiper pivot arm.
   1. Release the locking tab.
   1. Remove the windshield wiper pivot arm.

1. NOTE: During installation, it is necessary to pull the locking tab out to its full open (unlatched) position and hold while assembling the pivot arm onto the mounting arm and pivot shaft. Align the key on the pivot arm head with the keyway on the shafts. This will make sure the pivot arm is correctly aligned. If necessary, the key can be removed. To adjust wiper pivot arms, refer to Wiper Blade and Pivot Arm Adjustment in this section.
   To install, reverse the removal procedure.

rear wipers are horrid for that... i just bent the wiper arm a little toward the window... works fine

Robert

Please take a moment to rate this solution thanks

Remove the rear pivot arm.
Lift the pivot arm to the upright position.
Slide the locking tab out.
Pull up and remove the pivot arm.
Remove the rear wiper motor shaft nut cover.
Remove the rear wiper motor shaft nut.
Remove the rear wiper motor cover.
Remove the rear wiper motor bracket nut.
Remove the bolt and the rear wiper motor.