Visibility › Defroster/defogger/hvac system › Fan/motor
Mack MS200P and 1 more
Reported Dec 29, 19814,920 vehicles affectedMACK TRUCKS, INCORPORATEDBuilt Sep 1, 1979 – Aug 1, 1981
The 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.
The remedy
A speed variation resistance unit and an electric motor moisture protection cap will be installed without charge.
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.