One problem related to engine belts and pulleys has been reported for the 1998 GMC Sonoma. The most recently reported issues are listed below.
Consumer states during the last sixth months on several occasions the windshield wipers, when activated, work for a few seconds and then stop, causing a visibility problem, consumer has roated the wiper knob to high, turned it off, and slowed it down, neither of which relieve the problem, dealer stated motor needed replaced, however consumer feels that the motor was not the problem, so he is continuing to drive the vehicle as is. Serpentine belt failed and was replaced.