2008 Cadillac STS Headlight Washer Pump

You should discard the old Washer Pump grommet from the washer container.

The procedure is to insert the hook of the wiper arm through the opening in the Wiper Blade, position the wiper blade pivot in the inside radius of the wiper arm hook, pull the wiper blade pivot into the wiper arm hook until the pivot locks into the hook, ensure the blade is locked onto the wiper arm, return the wiper blades to the park position, operate the wipers and check for proper operation.

The procedure is to remove the windshield washer container from the vehicle.