Are you loosing antifreeze from the radiator and have to keep adding AF? Could be a leak from your dash heater core outside the firewall. There are often heater cores inside plastic boxes which leak out at strange places remote from the heater. Easily bypassed.
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'02 Winnebago Journey DL, DSDP, 36' of fun.
No, that isn’t it. But thanks for taking time to think about it and help me. It may have something to do with my fresh water tank and pump. I may have resolved it.