one side a/c isnt cool on 2004 Jaguar XK8

When I turn on the a/c, the air on drivers side comes out cool but the air on passenger is warm! any clues?

Asked by for the 2004 Jaguar XK8
Thinking you have a dual zone automatic climate control? There are separate blend doors and valves that control the operation of that system, and there could be a problem there.l