Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
If rocking the arm back and forth with the nut off doesn't release it from the shaft use a battery terminal puller to get under the arm and pop it off.
Windshield Wiper Arm Replacement Removal Procedure
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the nut to 23 N·m (17 lb ft)