MACK MR 1978: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:HEATER CORE

General Information

NHTSA Campaign ID Number: 79V014000

Make Model Year
MACK MR 1978
Date Owners Notified Date Received by ODI Date Added to Database
1979-02-02 1979-01-09 1979-10-12

Production Dates: 1978-03-01 - 1978-11-17

Manufacturers Involved: Mack Trucks, Inc.

Component: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:HEATER CORE

Potential Number Of Units Affected: 358

Report Initiator: MFR MFR Report

Summary

A DEFICIENCY IN THE ROUTING OF THE HEATER DUCT HOSE COULD ALLOW THE HOSE TO REST AGAINST A TERMINAL POST OF THE ACCESSORY RELAY. VIBRATION WILL EVENTUALLY CAUSE THE TERMINAL POST TO PENETRATE THE HOSE FABRIC AND SHORT CIRCUIT THE WIRE REINFORCEMENT AND OVERLOAD THE CIRCUIT.

Remedy

DEALER WILL REPLACE THE PORTION OF THE EXISTING HOSE THAT IS CLOSEST TO THE ACCESSORY RELAY WITH AN ALL-RUBBER HOSE.

Notes

VEHICLE DESCRIPTION: TRUCKS.SYSTEM: ELECTRICAL; HEAT DUCT HOSE.CONSEQUENCES OF DEFECT: DUE TO A LACK OF CIRCUIT BREAKER PROTECTION, FIRE ANDLOSS OF ALL ELECTRICAL CIRCUITS, INCLUDING HEADLIGHTS, CAN OCCUR AND POSSIBLYLEAD TO A VEHICLE ACCIDENT.