Cooling system: fanRecall 77V-173 · Mack vehicles

MACK TRUCKS, INCORPORATED recall 77V-173 covers 48,000 Mack vehicles for a cooling system: fan problem, reported to NHTSA on October 12, 1977.

Vehicles repairedNo manufacturer report yet

Vehicles affected48,00014 models

ReportedOct 12, 1977Owners notified Mar 23, 1978

Complaints since0Same system, after the recall

Source: NHTSA recall 77V173000 and manufacturer quarterly reports. Started by an NHTSA defect investigation.

What's wrong

The problem

THE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.

What to do

The fix

DEALER WILL REPLACE THE ORIGINAL FAN WITH A STEEL FIXED BLADE FAN, FREE OF CHARGE.

VEHICLE DESCRIPTION: TRUCKS EQUIPPED WITH SIX-CYLINDER ENGINES.SYSTEM: ENGINE COOLING; FAN.CONSEQUENCES OF DEFECT: BROKEN PIECES CAN BE PROPELLED OUTSIDE OF THE FANSHROUD AND WILL PRESENT AN IMMEDIATE DANGER AND POSSIBLE INJURY TO PERSONSSTANDING NEARBY.NOTE: PRIOR TO CORRECTION, VEHICLE SHOULD NOT BE SERVICED WITH THE HOOD RAISEDAND THE ENGINE RUNNING.

Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.

14 models