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WIPER ARM LINKAGE COULD BE BINDING.REMOVE WIPER ARM TO SEE IF WIPER MOTOR OPERATE SLOWLY.IF YES CHECK TO MAKE SURE WIPER MOTOR GETTING GOOD GROUND CONNECTIONS BY CHECKING MOVING WIRES .IF WIPER MOTOR SPEEDS UP YOU HAVE GROUND WIRE PROBLEM. IF WIPER MOTOR REMAIN SLOW GROUND WIRES CHECK OUT OKAY.REPLACE WIPER MOTOR.IF WIPER MOTOR RUN FAST NORMAL SPEED AFTER DISCONNECTING WIPER ARM.WIPER ARM LINKAGES IS BINDING OR NEED SOME LUBRICATION TRY WD40 SEE WHAT HAPPENS.LUBRICATION DONT HELP WIPER LINKAGE COULD BE DAMAGED.
remove wipers. remove plastic covering by loosening plastic screws first. unplug wiper motor wires. there are about three 10mm nuts at the motor location and you also have to unscrew the big nuts that were below the wipers when you unscrewed them. replacement is reversal.
The common way of controlling wiper speed is to use a 'tapped' resistor that supplies reduced voltage to the wiper motor on all but the fast setting.
They have to dissipate a good bit of heat and are subject to failure; I think yours has done that.