Sable V6-3.0L VIN U (1999)
Blend Door Actuator: Description and Operation
Air Door Actuator
General Information
The vacuum control motors direct system airflow to the different outlets. There are two types of vacuum control motors used in the system:
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single-diaphragm for air inlet and windshield defroster door operation
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double-diaphragm for air damper door operation
Single-diaphragm motors have two positions:
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shaft extended with no vacuum applied
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shaft retracted with vacuum applied
Double-diaphragm motors have three positions:
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shaft fully extended with no vacuum applied to either port
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shaft halfway extended with vacuum applied to only one port
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shaft fully retracted with vacuum applied to both ports
The vacuum control motors are located on the A/C evaporator housing and the heater air plenum chamber.
With Electronic Automatic Temperature Control
