When I turn the knob all the way to high they just go at a regular speed
My car has 50000 miles.
My car has an automatic transmission.
Wiper speed not changing with settings can be caused by a couple of different things. The wiper switch may have broken mechanical contacts or broken electrical circuits internally. Also, the wiper motor may have electrical issues. AN internal resistor may not be allowing any variation in voltage, which controls the wiper speed. Have a certified technician inspect the wiper system to isolate the exact cause.
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