I did take a quick look at the link you provide.
A lot of good info and helpful schematics.
I wonder if what they refer to as the Fan Motor Control Valve on Page 7, Figure 6, is the same thing as what you and others might call the Spool Valve?
I'm guessing it is. But I need to be sure and more so: when ordering parts that can be found on different coaches.
But then were does the Switching Valve come into play?
Where would I find it on your coach and is it part of the Spool Valve or if that is the same as the Fan Motor Control Valve where is the Switching valve?
Back to more reading... Grin