Engine and engine cooling: cooling system: fan (Mack)
Vehicle recall 77V-173. NHTSA received MACK TRUCKS, INCORPORATED’s report on Oct 12, 1977.
Watch and the shortlist are kept with a free account, on every device. Your watch list. NHTSA’s own record is on nhtsa.gov.
The short answer
NHTSA received MACK TRUCKS, INCORPORATED’s report on Oct 12, 1977. Copied from NHTSA on Oct 28, 2026.
Every line below is in NHTSA’s own words, with its source beside it.
What’s wrong with it?
The notice gives no hazard in a field of its own.
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.
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
- NHTSA’s part: Engine and engine cooling: cooling system: fan.
What should you do?
DEALER WILL REPLACE THE ORIGINAL FAN WITH A STEEL FIXED BLADE FAN, FREE OF CHARGE.
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
- How to reach the firm: 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.
- Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.
Which ones are recalled?
NHTSA counts 48,000 vehicles potentially involved, across everything this recall names.
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
- Mack FLand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack Rand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack Uand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack RDand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack HMMand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack Fand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack DMMand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack CFand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack FSand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack RLand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack RMand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack WLand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack WSand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
- Mack DMand 1972, 1973, 1974, 1975, 1976 and 1977, before the model years listed here
Who is recalling it?
- Made by MACK TRUCKS, INCORPORATED.
NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.
What the record doesn’t say
- NHTSA’s recall file doesn’t say whether anyone was hurt.
- Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
- This recall names only model years before 2015, which have no pages here. Your VIN, at NHTSA, says which recalls are open on a vehicle.
- How many have been returned or fixed isn’t in the notice.
Hearth Record wrote these lines.
Sources
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National Highway Traffic Safety Administration, Recalls flat file before 2010 (FLAT_RCL_PRE_2010).
Released Oct 28, 2026 and checked Oct 28, 2026. Updated daily. Public domain (U.S. Government work).
Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 28, 2026.