Mustang GT V8-4.6L SOHC VIN X (1998)
Air Door Actuator / Motor: Description and Operation
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
