[encantotom]

at least on the series 60 coaches, newell put 4 old fashioned valves in a manifold to isolate the coolant lines going to the dash and the aquahot. they are on the framerail on the drivers side just inside the back of the coach. on mine there is a plastic plaqueard that labels which is which. one valve is going and one is coming back.

a word of caution is that they are not ball valves so exercising them may make them leak. at least it did on mine.

tom