Two problems related to windshield wiper/washer motor have been reported for the 2004 Chevrolet Silverado. The most recently reported issues are listed below.
While parked on the street, locked and not in use for 7 days, a fire apparently started in the windshield wiper motor. It was significantly damaged and spread to the right front wheel well and left front bumper cowling, before it was put out with a fire extinguisher. The gm investigator has indicated that it is their determination that the problem started external to the vehicle.
While driving in a very heavy rain storm windshield wipers completely broke. Consumer could not get them to work again. Consumer stated that windshield wipers just flopped to the left, hitting the side view mirror.