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Home >> Lincoln >> 1979 >> Versailles >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Auto. A/C Systems >> Components >> Control Head >> All Models >> Mode Selector
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Mode Selector

This is a 9-port vacuum selector valve similar to that used on manual A/C systems. It directs vacuum to various vacuum motors and connects vacuum from the EVR to the outside air-recirc door in "HEAT" mode. Two electrical switches are also controlled by the vacuum selector (mode selector). The, combination of these cam-operated electrical switches controls the current to the A/C clutch and blower switch.