As your bus nears the 10-year mark, it’s a good idea to start replacing your hoses if you haven’t already.
The picture shows a hose that Liberty Coach typically installs to supply engine coolant to the hot water heater jacket. This hose is about 10 feet long, starting from a quarter-turn ball valve on the engine (left side), running over the drive axle, and ending at a copper pipe above the right rear tag axle.
If this hose fails, it’s not an easy fix. As seen, the dry rot cracking becomes evident with even slight pressure. It’s likely that all original hoses (except for the silicone ones) are in similar condition. This particular hose is in a spot that is prone to excessive heat.