I replaced all the coolant hoses with silicone over this past Easter. It was a big job but well worth it. The peace of mind knowing the system is solid is greatly appreciated. It took three long days and left me with lots of cuts and bruises on my arms. IMPORTANT: Use the correct clamps—at a minimum, lined barrel clamps or T-clamps. I was able to purchase lengths of silicone hose through Green Line Hose (here in Canada), in sizes 1/2″, 5/8″, 3/4″, 7/8″, 1″, and 2″. The project included not just the engine but all coolant hoses in the Webasto system as well.
I’m getting there with my vintage of coach—last year it was all new air springs and most of the Norgren valves, and this year it was the coolant lines and all eight tires.