Fusion FWD L4-2.3L VIN Z (2007)
Control Assembly: Description and Operation
Control Components
CONTROL COMPONENTS
ELECTRONIC MANUAL TEMPERATURE CONTROL
The electronic manual temperature control (EMTC) components are used to select:
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air inlet source (outside or recirculated).
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blower motor speed.
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discharge air temperature (temperature blend).
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discharge air location (defrost, panel, floor).
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A/C compressor operation.
Control System Inputs
The EMTC system has 2 system control inputs.
Climate Control Assembly (EMTC Module)
The climate control assembly integrates the temperature control, airflow mode selection, A/C request button, recirculated air request button and rear
defog switch into a single unit.
The temperature control switch setting determines air temperature. Movement of the temperature display from COOL (blue) to WARM (red) causes a
corresponding movement of the temperature blend door and determines the air discharge temperature that the air distribution system will maintain.
The temperature control switch is an integral part of the climate control assembly and cannot be installed separately.
The A/C request button determines A/C compressor operation, except when the function selected is in the OFF, MAX or DEFROST mode. The A/C
request button is an integral part of the climate control assembly and cannot be installed separately.
The recirculated air request button can select recirculated air in any mode except DEFROST, and fresh air in any mode except MAX A/C or OFF.
The rear defog button signals activation of the heated backlight. The rear defog button is an integral part of the climate control assembly and cannot be
installed separately.
The EMTC module is not equipped with self-test capabilities.
Control System Outputs
The EMTC system has 3 system outputs.
Temperature Blend Door Actuator
The temperature blend door actuator:
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is located on the heater core and evaporator core housing.
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moves the temperature blend door on command from the EMTC module.
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contains a reversible electric motor and a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the
output shaft to indicate the position of the temperature blend door.
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applies a 5-volt signal to one end of the potentiometer and ground to the other. The voltage available at the wiper indicates the position of the
potentiometer. The expressed value of the actuator wiper voltage is sent to the EMTC module and is matched with an expected wiper voltage
value. The EMTC module then drives the actuator motor in whichever direction is necessary to make the actuator wiper voltage agree with the
expected EMTC module wiper voltage value.
Mode Door Actuator
The mode door actuator:
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uses a cam setup to direct system airflow to the vehicle interior as determined by the climate control assembly.
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contains a reversible electric motor.
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contains a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the output shaft to indicate the position
of the mode door.
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applies a 5-volt signal to one end of the potentiometer and ground to the other. The voltage available at the wiper indicates the position of the
potentiometer. The expressed value of the actuator wiper voltage is sent to the EMTC module and is matched with an expected wiper voltage
value. The EMTC module then drives the actuator motor in whichever direction is necessary to make the actuator wiper voltage agree with the
expected EMTC module wiper voltage value.
Air Inlet Mode Door Actuator
The air inlet mode door actuator:
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moves the air inlet door between the FRESH and RECIRC positions on command from the EMTC module.
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contains a reversible electric motor.
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automatically stops when it reaches the full FRESH or full RECIRC position and does not report its position back to the EMTC module.