This Service Bulletin addresses an issue with the Cascadia radiator strut rod potentially rubbing against the upper radiator hose. It covers a range of Freightliner models, including Cascadia, COE models (FLA, FLB, FLB), Conventional models (FLD, FLC 112, Century Class), Argosy COE, Cargo, Columbia, 122SD and Coronado, Business Class M2, and 108SD/114SD. The manual provides detailed information about the problem, including potential causes and recommended solutions. It offers step-by-step instructions and diagrams for technicians to diagnose and repair the issue effectively. You will find valuable insights on proper inspection procedures, replacement part information, and preventative measures to avoid future occurrences of this problem. This comprehensive guide helps ensure safe and efficient operation of your Freightliner vehicle.

The Cascadia Radiator Strut Rod Rubbing on Upper Radiator Hose (SB2078) issue is a known problem affecting a wide range of Freightliner trucks, specifically those manufactured between 2011 and 2017. This issue stems from a design flaw where the radiator strut rod, a crucial component of the truck's suspension system, can rub against the upper radiator hose. The contact point is typically located near the hose's clamp, where the rod passes close to the radiator and its associated components. This rubbing action can cause significant damage to the radiator hose, potentially leading to leaks and overheating issues. The symptoms of this issue are quite evident. Drivers may notice a hissing sound emanating from the engine compartment, particularly when the truck is under load. In severe cases, the radiator hose may develop cracks or even rupture entirely, resulting in a loss of coolant and a significant risk of engine damage. The problem affects a wide range of Freightliner models, including the FLA, FLB, FLD, FLT, FLC, Century Class, Argosy, Cargo, Columbia, 122SD, Coronado, Business Class M2, Cascadia, 108SD, and 114SD. This issue has been a source of concern for Freightliner truck owners and operators due to the potential safety implications and costly repairs involved.