Air compressor coolant plumbing

[wayne]

  I have a Setra with a 1994 8V92TA. I just noticed that the coolant for air compressor comes from the rear of the left head, travels through the compressor, then returns to the rear of the same head. The fittings are approximately 3"  from each other on the same head surface. I just can't imagine the coolant is actually circulating. Does anyone have the same engine that can take a look to see where it is plumbed?

[luvrbus]

Wayne, I hook mine up to one side of the block below the head and the other to the plug at the water pump, hooking to each side of the block below the heads seems to be the norm never saw one plumbed like yours

good luck