NHTSA Recall 81V157000
Filed by Mack Trucks, Inc.. Component: Visibility. Reported 1981-12-29. An estimated 4,920 vehicles are affected. Recall repairs are free at any authorized dealer.
Defect
WHEN THE IGNITION KEY IS IN THE "ON" POSITION AND THE HEATER IS OPERATING AT THE "LOW" OR "MEDIUM" SETTING, THE HEATER SWITCH WIRING WILL OVERLOAD IN THE EVENT THE HEATER MOTOR SEIZES.
What the manufacturer will do
A SPEED VARIATION RESISTANCE UNIT AND AN ELECTRIC MOTOR MOISTURE PROTECTION CAP WILL BE INSTALLED WITHOUT CHARGE.
Notes
VEHICLE DESCRIPTION: TRUCKS.SYSTEM: HEATING; CAB HEATER MOTOR, ELECTRICAL SWITCH.CONSEQUENCES OF DEFECT: IF THE VEHICLE IS STANDING STILL (PARKED OR STOPPED INTRAFFIC) HEAT GENERATED BY THE OVERLOAD MAY MELT AND IGNITE THE SURROUNDINGPLASTIC HOUSING AND WIRE COVERING. A FIRE COULD SPREAD QUICKLY THROUGHOUT THECAB, CAUSING SERIOUS INJURY TO VEHICLE OCCUPANTS.NOTE: OWNER IS ADVISED TO MAKE SURE HEATER/DEFROSTER FAN MOTOR IS FUNCTIONALBEFORE USING CAB HEATER PRIOR TO REPAIR. HEATER/DEFROSTER BLOWER SHOULD NOT BEUSED IN "LOW" OR "MEDIUM" SPEEDS WHILE THE VEHICLE IS STOPPED OR ENGINE ISIDLING.