NHTSA Complaint #10245207 — 1998 CHEVROLET BLAZER

1998 CHEVY S-10 BLAZER WITH 97K MILES AND THE WINDSHIELD WIPERS WORKED INTERMITTENTLY. THIS WOULD UNFORTUNATELY OCCUR WHEN THE WINDSHIELD WASHER BUTTON WOULD BE PRESSED LEAVING THE WINDSHIELD COMPLETELY COVERED IN SOAPY SOLUTION AND MAKING IT DIFFICULT TO SEE. AFTER VISITING SEVERAL WEBSITES THE ANSWER TO OUR PROBLEM WAS ON THIS LINK HTTP://WWW.AUTOMOTIVEHELPER.COM/TOPIC130258.HTM. THE CONTROL CIRCUIT CARD ATTACHED TO THE WINDSHIELD WIPER MOTOR ASSEMBLY HAD CRACKED SOLDER JOINTS ON 7 PINS OF THE HARNESS CONNECTOR. I BELIEVE THIS TO BE A SOLDER FATIGUE PROBLEM DUE TO VIBRATION AND TEMPERATURE CYCLING AND THE FACT THAT THE HARNESS CONNECTOR BODY IS LONG AND MADE OF A DIFFERENT MATERIAL THAN THE CIRCUIT CARD LEAVING THE SOLDER JOINTS UNDER STRESS DUE TO MISMATCH OF THERMAL EXPANSION COEFFICIENTS. CONSEQUENTLY, AFTER TEN YEARS THE SOLDER JOINTS FINALLY GAVE UP. THE GOOD NEWS IS THAT THE CIRCUIT CARD IS EASY TO REMOVE (3 TORQUE SCREWS) AND THE SOLDER JOINTS CAN BE SIMPLY REFLOWED WITH A SOLDERING IRON AND FRESH SOLDER. THE SOLDER JOINT CRACKS ARE EASY TO SEE USING A MAGNIFYING GLASS. THE WIPERS ARE NOW WORKING PROPERLY AGAIN. *TR