1. The outside faucet in the utility bay, make sure both cold and hot are off.
2. There are winterizing valves. There should be a diagram to show the position of the valves when using the coach.
3. Behind the water heater there is a bypass valve. Make sure the valve is closed.
There is a Newmar owner's forum on iRV2. On the main iRV2 page, scroll down to the Owner's cornet. There you will find the Newmar Owner's forum.
Nobody knows your coach like someone who owns one just like yours.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours