Engine and engine cooling: engine: diesel (Thomas Built and Thomas Built Buses)
Vehicle recall 12V-570. NHTSA received Daimler Trucks North America’s report on Dec 11, 2012.
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The short answer
NHTSA received Daimler Trucks North America’s report on Dec 11, 2012. Copied from NHTSA on Oct 20, 2026.
Every line below is in NHTSA’s own words, with its source beside it.
What’s wrong with it?
If this occurs, the fan belt may lose engagement of the water pump, allowing the cooling system to overheat. This may result in exceeding temperature limits, potentially disabling the school bus. If the school bus is occupied when it becomes disabled, the occupants would need to exit the vehicle and be transferred to another vehicle, putting them at risk of injury.
Daimler Trucks North America (DTNA) is recalling certain model year 2011 through 2013 Thomas Built school buses manufactured from March 2010 through July 2012, equipped with Cummins ISB6.7 diesel engines manufactured from February 16, 2010, through May 4, 2012, containing a fan pulley, part number 3914462.
The subject fan pulley is part of the accessory drive system on the front of the engine.
This system is used to drive such components as the refrigerant compressors, the radiator fan, and the engine water pump.
The web of the pulley can fatigue over time, causing the pulley to fail.
NHTSA, Recalls flat file. Released Oct 20, 2026. Updated daily.
- NHTSA’s part: Engine and engine cooling: engine: diesel.
What should you do?
Cummins will notify owners of the recall. Repairs will be performed by Cummins authorized service facilities. A new fan drive pulley will be installed free of charge. The safety recall began on January 4, 2013. Owners may contact Cummins at 1-812-377-5000 or DTNA at 1-800-547-0712.
NHTSA, Recalls flat file. Released Oct 20, 2026. Updated daily.
- How to reach the firm: DTNA’s recall campaign number is FL-635.Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
- Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.
Which ones are recalled?
NHTSA counts 6,296 vehicles potentially involved, across everything this recall names.
NHTSA, Recalls flat file. Released Oct 20, 2026. Updated daily.
- Thomas Built SAF-T-Liner C2and 2011, before the model years listed here
- Thomas Built Buses SAF-T-Liner C2and 2012 and 2013, before the model years listed here
Who is recalling it?
- Made by Daimler Trucks North America.
NHTSA, Recalls flat file. Released Oct 20, 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 (FLAT_RCL_POST_2010).
Released Oct 20, 2026 and checked Oct 20, 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 20, 2026.