Because there is too mutch friction between it and the windsheild.
The wiper arm is attached to the pivot which is part of the wiper transmission, which in turn is attached to the wiper motor.
turn it off The rear wiper switch is on the end of the turn signal arm. Look at the picture on the arm to see where off is.
The wiper arm (not the wiper blade) has a u shape bend on the end of the arm. So you have to pull the arm away from the Jeep, then turn the blade a half turn, pivoting it around the end of the arm, then pushing down towards the bottom of the arm.
The wiper motor doesn't turn off until the wiper arm gets to the "park" location. If the wiper motor never detects park, the wipers will stay running.
Take it to autozone, they change it for free. If not you turn the wiper so its perpendicular to the wiper arm and push down.
To remove the wiper arm on 94 Chevy SUV's, first raise the wiper arm so that it is turned to a 90 degree angle from the windshield. The wiper arm should stay there once it is raised. At the base of the wiper arm, note a small piece of metal sticking out. Using a screwdriver, gently pry the piece of metal OUTWARD, from the center of the wiper arm shaft. Once the "keeper" has been removed the wiper arm should lift straight off the shaft.
This is pretty simple. Just turn on the wipers and stop them while the arm is in the middle of the windshield or there about. Then just change as any other wiper.
MOST GM wiper arms remove the same way; lift the wiper arm so that it is at a 90 degree angle to the window, it should stay there. At the base of the arm there should be a little piece of metal that sticks out just enough to get a screwdriver between it and the rest of the arm. Pry the metal away and it should pivot out of the slot that holds the wiper arm in place. Once the retainer is moved, the wiper arm should pull straight off of the shaft.
# Raise the rear wiper arm finish cap to expose the wiper arm nut. # Remove the rear wiper arm nut (1). # Lift the rear wiper arm assembly (2) away from the rear window and remove the wiper arm from the pivot shaft. The cap tilts up toward the arm
If only one arm is moving then you have a linkage problem. If your not a mechanic its best to take it to one to fix this problem.
Wiper travel is non-adjustable on Subarus-- but wiper position is indeed adjustable. Flip up the cover (or pry out the rubber insert) to gain access to the wiper arm bolt. This holds the wiper arm to the pivot shaft. The wiper arm and the pivot shaft have tiny grooves in them-- once in the groove and the bolt tightened, the arm is locked to the shaft. Recheck bolt tightness after a day or so of wiper operation in case it works loose-- if still tight, it will stay that way for years unless heavy snow mashes the arm down. Then you have to loosen the bolt, reposition the wiper arm, and tighten the bolt again.
Answer: Copied from another site: You have a mechanical park switch which is part of the wiper crank arm.it acts as a clutch plate ,more than likely the mechinisim will have to be replaced .or Either the crank arm is bad, out of adjustment, or the crank arm tab is bent. Install the crank arm on the wiper motor. Turn the ignition switch to the ACCY position. Set the wiper switch to PULSE position. The wiper motor should be operating. Turn the ignition switch to OFF when the wiper motor is in the innerwipe position. Important Do not rotate the wiper motor shaft during the installation of the crank arm. Install the crank arm on the wiper motor while maintaining a 4-8 mm (0.157- 0.315 in) gap between the V-grove in the wiper motor crank arm and the tab. Install the screw. Tighten Tighten the screw to 14-17 N