Contour L4-122 2.0L CNG DOHC VIN Z SFI (1996)
Air Door Actuator / Motor: Description and Operation
The vacuum control motors direct system air flow 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 door operation
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double-diaphragm for air damper and windshield defroster 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 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.