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Welcome to iRV2. It depends on when the coolant change is required. To be efficient it would be best to do both at the same time. I check my hoses/clamps during annual maintenance. My next coolant change will be when the coach is 10-11 years old. I will change the rubber parts at that time.
I keep several spare hoses in case there is a problem. My Cummins setup has only the really short (8" hoses) connecting the solid piping.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours