Electronic Manual Temperature Control (EMTC) System
The HVAC system heats or cools the vehicle depending on the control panel selection.
- The control panel selections determine heating or cooling, air distribution and enables blower motor operation.
- The temperature control setting determines the air temperature.
- The blower motor switch varies the blower motor speed.
- During A/C operation the system also reduces the relative humidity of the air.
The HVAC system operation is determined by the settings on the climate controls. To control the various functions, the HVAC system is composed of the following:
- HVAC module
- Front Controls Interface Module (FCIM)
- Audio Control Module (ACM) or Front Display Interface Module (FDIM)
- Blower motor speed control
- Mode door actuator
- Air inlet door actuator
- Temperature blend door actuator
The blower motor switch:
- sets the blower motor speed.
- is serviced only with the FCIM .
The A/C request button:
- can command the A/C compressor ON when the function selector switch is in PANEL, FLOOR/PANEL, FLOOR/DEFROST and FLOOR when the A/C request switch is pressed. Indicator illuminates when A/C request switch is toggled ON.
- is inoperative in MAX A/C, OFF and DEFROST.
- indicator illuminates when the function selector switch is in MAX A/C and cannot be toggled.
- indicator does not illuminate in OFF and cannot be toggled.
- indicator does not illuminate in DEFROST but can be toggled ON or OFF. The A/C compressor will operate regardless of indicator status if the outside air temperature is above 6°C (43°F).
- is serviced only with the FCIM .
The function selector:
- selects airflow direction.
- is serviced only with the FCIM .
The temperature selector:
- selects full warm and full cool as well as blended outlet temperatures.
- is serviced only with the FCIM .
The air recirculation button:
- selects either recirculated or outside air source.
- recirculates air in any mode except DEFROST, if requested.
- is disabled in MAX A/C or OFF mode where recirculated air only is used.
- is disabled in DEFROST mode where outside air only is used.
- is serviced only with the FCIM .