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Well, the only way this would work is if you add the part you have on order with the additional butterfly valve (the one that goes in place of the 'T" shown as number 20 in your original post and that has the additional valve as shown in my picture of the white ROW car) and remove the butterfly valve from the right hand side of the blower assembly, if one is present there.
If you have two butterfly valves in the blower assembly, and one of the simple "T" fittings (part number 20 in your original post) in place of that additional valve assembly, there is no way you can use the control settings as they show them.
I think you understand the flow of the system; who knows what Porsche was thinking?
JR
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