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I am trying to fix the air/ heat selector, it only blows out the defrost.

(1998 Mercury Mystique)
in Portland, MI on March 14, 2012
I unhooked the vacuume connector to the switch and traced the hoses. four of them go to two silver canisters under the dash another one goes into the dash and I lost it. I assume that one of these hoses has to go to the engine to provide the vacuume to the switch. I don't hear any air/ vacuume from the hoses at the connector with the engine running. How can I find out where the vacuume hose from the engine is located? Is there a diagram available to trace the hoses?
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