Explorer Sport Trac 4WD V6-4.0L VIN E (2007)
The blower speed control converts low power signals from the dual-zone EATC module to a high current, variable ground feed for the blower motor.
A delay function is used to provide a gradual increase or decrease in blower motor speed under all conditions.
Temperature Blend Door Actuators
The dual-zone EATC system uses 2 temperature blend door actuators to control 2 separate temperature blend doors. The temperature blend doors
independently vary the LH side and RH side temperature settings, as desired. The temperature blend door actuators each contain a reversible electric
motor and a potentiometer. The dual-zone EATC module applies a 5-volt signal to one end of the potentiometer and ground to the other. The
potentiometer wiper is connected to the actuator output shaft and moves with the output shaft. The voltage available at the wiper indicates the position
of the temperature blend door. The actuator wiper voltage is sent to the dual-zone EATC module which drives the actuator motor in whichever
direction is necessary to make the actuator wiper voltage agree with the expected dual-zone EATC module wiper voltage value.
Vacuum Control Motors
The 4 vacuum control motors move the airflow mode doors to direct system airflow to the vehicle interior as determined by the function selector
switch. Vacuum control motors are used to control the
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air inlet door.
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defrost mode door.
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panel mode door.
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floor mode door.
