The blade on the flanger is controlled by the engineer of the locomotive ahead of it. There are a pair of air valves below the automatic brake valve. One controls the pilot truck flanger, the other valve sends air to an air hose on the back of the tender that operates the flanger blade. It is the engineers job to raise the blade to clear crossings, cattle guards, switches etc.
The Jordan Spreader uses air from the same hose on the back of the tender, but in this case the air fills a reservoir on the Jordan. The Jordan has a separate operator in the cab to control the operation of the spreader blades.
As I mentioned above, the auxiliary air line to run the snow equipment does not go through the flanger or the Jordan to the rear, so it is not possible the put the two together and operate them at the same time. Also remember there are no operating valves to operate the blades on the flanger. That is done from the locomotive ahead.