One problem related to windshield wiper/washer linkages has been reported for the 1998 GMC Sonoma. The most recently reported issues are listed below.
My 98 GMC Sonoma's windshield wiper module failed causing poor visibility during rain. Initially, I was able to tap the module to regain wiper use, but the problem has become unmanageable. I have taken my vehicle to be repaired at neil twinter motors costing $95. 81.