No worries; it was not mine anyway.
Stolen from some one else.
OK, lets assume for a minute Willy is correct and there is only one valve (somewhere). That would have to mean his camper DOES NOT have a winterizing bypass kit installed. Other wise there would be either two valves and a check valve or three valves depending on manufacturer.
So, one valve.
Why warm and not cold?
If the heater is inop, there would be cold water only.
We keep coming back to the bypass being installed and it is open allowing cold water to mix with the hot water coming out of the hot water heater.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW