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The wiper arms are 'pressed' onto the wiper motor spindles, often at times when only one of them stops operating, it is because the splines on the wiper that is no longer operating has become stripped out. and may need to either be replaced or tightened. I would recommend tightening it first, then replacing it if that does not correct it. You can access the hold down bolt (if it is not exposed) by taking a small screw driver and prying up the bolt cap. The bolt is usually a 13mm, and is more easily tightened by a ratchet and socket of the same size.
Turn the ignition on, and turn the front windshield wipers on. When the wipers are facing straight up on the window, turn the ignition off so they remain in that position.
Disconnect the negative battery cable with an adjustable wrench. Remove the passenger side wiper blade assembly, by removing the pivot nut at the bottom with an adjustable wrench. Remove the wiper linkage access cover, and use a screwdriver to remove the wiper motor clip. Remove the wiper linkage from the wiper motor.
Disconnect the electrical connector on the wiper motor. Remove the bolts and nuts, securing the wiper motor with a socket wrench. Remove the wiper motor from the vehicle. Install the new wiper motor, and tighten mounting bolts and nuts with a socket wrench. Connect the electrical harness to the new wiper motor. Connect the wiper linkage, and insert the linkage clip. Install the wiper blade assembly, and tighten the nut with an adjustable wrench.
Connect the negative battery cable securely, using an adjustable wrench.
It's probably a loose nut where the blade attaches to the body!
You'll have to pry open the hinged cover with your hand or a screwdriver to expose the nut then just tighten it up.
I've had this problem.