Recall 81V-157: 1979–1981 Mack MS200P, 1979–1981 Mack MS300P
MACK TRUCKS, INCORPORATED recall for visibility, reported to NHTSA on Dec 29, 1981, covering about 4,920 vehicles.
The problem
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 fix
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.
Recall details
| Manufacturer | MACK TRUCKS, INCORPORATED |
|---|---|
| Component | Visibility › Defroster/Defogger/Hvac System › Fan/Motor |
| Recall started by | the manufacturer |
| NHTSA campaign number | 81V157000 |
Vehicles in this recall
Not every vehicle of these model years is included. Enter your VIN at nhtsa.gov/recalls ↗ or ask a dealer.
Frequently asked questions
What is recall 81V-157?
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.
How is recall 81V-157 fixed?
A speed variation resistance unit and an electric motor moisture protection cap will be installed without charge.
Is the recall repair free?
Yes. Safety recall repairs are free at authorized dealers. Check whether your vehicle is included with its VIN at nhtsa.gov/recalls.