2000 GMC C3500 Windshield Wiper Arms

You should disconnect the washer hose, lift the wiper arm from the windshield, disengage the retaining latch with a screwdriver, disengage the washer hose and grommet from the liftgate and remove the wiper arm from the wiper motor drive shaft.

You should mark the position of the wiper blade on the windshield with a suitable marker or a piece of masking tape, remove the washer hose, lift the wiper arm from the windshield, disengage the retaining latch with a screwdriver and remove the wiper arm from the transmission drive shaft.

You should position the wiper arm on the transmission drive shaft so that the wiper blade aligns with the mark made on the windshield before removal, seat the arm assembly on the drive shaft, press in the retaining latch, connect the washer hose, clean the position mark or masking tape from the windshield and operate the wipers and check for proper operation.

You should install the wiper arm assembly onto the wiper motor driveshaft with the wiper blade in parked position (blade parallel to the edge of the glass), install the washer hose and grommet in the liftglass, lift the wiper arm extension and push in the retaining latch when the head is fully seated onto the driveshaft and connect the washer hose.