my 04 expedition rear wiper hung up and was not in the complete park position. this would drain the battery . pull the fuse until you can repair the "wiper shaft". it's real easy.
•Flip open the wiper arm lid over the shaft nut
•remove the shaft nut
•remove the rubber type grommet
•clean and remove the "C" type clip ring on the shaft
•remove the large nut that was under the grommet
•open the rear window
•make note where inside nuts are prior to removing for correct installation later
•remove the two nuts that hold assembly to rear glass
•remove the assembly
--you will notice the assemble arm is hard to move or doesn't seem to move
•oil up where the wiper arm nut was, to help with freeing the shaft
--you will see a washer on the shaft and under that an "O-ring" remove them
•put the nut back on the shaft so you don't ruin the threads
•start tapping the nut with a hammer
--the shaft is going to slide out the assembly, but may need to be tapped a number of times
•once out oil the shaft and the brass sleeve where the shaft was in
•clean the gunk off the shaft
•clean the gunk out of the sleeve
•grease up the shaft and reinstall into sleeve
--put assemble back together and notice how easy it moves now.
--put assembly back on the rear glass where original markings were
•wiper arm needs to be in the "park" position, down
•install fuse and test!
•Flip open the wiper arm lid over the shaft nut
•remove the shaft nut
•remove the rubber type grommet
•clean and remove the "C" type clip ring on the shaft
•remove the large nut that was under the grommet
•open the rear window
•make note where inside nuts are prior to removing for correct installation later
•remove the two nuts that hold assembly to rear glass
•remove the assembly
--you will notice the assemble arm is hard to move or doesn't seem to move
•oil up where the wiper arm nut was, to help with freeing the shaft
--you will see a washer on the shaft and under that an "O-ring" remove them
•put the nut back on the shaft so you don't ruin the threads
•start tapping the nut with a hammer
--the shaft is going to slide out the assembly, but may need to be tapped a number of times
•once out oil the shaft and the brass sleeve where the shaft was in
•clean the gunk off the shaft
•clean the gunk out of the sleeve
•grease up the shaft and reinstall into sleeve
--put assemble back together and notice how easy it moves now.
--put assembly back on the rear glass where original markings were
•wiper arm needs to be in the "park" position, down
•install fuse and test!