This comprehensive service bulletin, designated sb4933, addresses issues related to DEF and Coolant line and fitting leaks. The bulletin is applicable to a wide range of Freightliner trucks, encompassing models like FLA COE, FLB COE, FLD Conventional, Business Class, FLC 112 Conventional, Century Class Conventional, Argosy COE, Cargo, Columbia, Coronado, Business Class M2, Cascadia, and 108SD/114SD. The bulletin provides technicians with detailed information on troubleshooting and resolving common leak issues associated with DEF and Coolant lines and fittings. The content includes diagnostic procedures, repair guidelines, and component replacement instructions, ensuring efficient and effective repair solutions for these critical systems.

The Service Bulletin sb4933, titled "DEF and Coolant Line and Fitting Leaks," addresses a potential issue affecting a wide range of Freightliner trucks, specifically those models manufactured between 2010 and 2014. This issue centers around leaks developing in the DEF (Diesel Exhaust Fluid) and coolant lines and fittings, which can lead to severe consequences if left unaddressed. These consequences include a loss of DEF, causing the engine to go into a reduced power mode, and a loss of coolant, potentially leading to engine overheating and severe damage. The affected models encompass a considerable portion of Freightliner's lineup, spanning their most popular cab configurations – COE (Cab Over Engine) like the FLA, FLB, and Argosy, as well as conventional models such as the FLD, Business Class, FLC 112, Century Class, and Cargo. The bulletin also includes popular models like the Columbia, Coronado, Business Class M2, Cascadia, and the 108SD/114SD. This service bulletin highlights the importance of regular inspections and maintenance in ensuring the longevity and safe operation of Freightliner trucks. The potential for leaks in DEF and coolant lines necessitates prompt attention from both fleet managers and individual truck owners. The bulletin provides detailed guidance on identifying potential leaks and emphasizes the importance of using genuine Freightliner parts for any repairs or replacements. It also serves as a reminder that neglecting these issues can lead to costly repairs and downtime, impacting both the efficiency of the truck and the safety of the driver and other road users. While this bulletin addresses a specific issue, it underscores the importance of proactive maintenance and preventative measures for all heavy-duty vehicles, ensuring they function reliably and safely throughout their lifespan.