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AC and Heater Vacuum Line Layout


Note that the vacuum supply comes into the cabin via the purple hose #3.  If you do not have vacuum under the dash on the purple hose, then you need to go back under the hood and find out why.  You can also use a Mitey-Mite under the dash to supply vacuum to the vacuum control switch (#16 on the drawing) via the purple hose if you wish to confirm the operation of the control head and correct routing of the air flow versus selector position.