The first thing you need to do is to clean the
outside of the wiper motor the best you can. This
motor works based on the ability to form good
vacuum seals, and that just can't happen if you
have dirty seals.
Next, take a look at the air intake port on the bottom of the motor. If its plugged with dirt, then you'd found the problem. (Don't confuse the air filter just inside the intake for blockage--I'm taking about debris in the intake hole itself.)
If the intake port is clear, then you need to take the motor completely apart for cleaning, polishing and relubricating. Begin by removing all of the funny little screws from the outside of the motor.
Next, take a look at the air intake port on the bottom of the motor. If its plugged with dirt, then you'd found the problem. (Don't confuse the air filter just inside the intake for blockage--I'm taking about debris in the intake hole itself.)
If the intake port is clear, then you need to take the motor completely apart for cleaning, polishing and relubricating. Begin by removing all of the funny little screws from the outside of the motor.
