Electronic Manual Temperature Control (EMTC) System

The EMTC  system heats or cools the vehicle depending on the HVAC module - EMTC  control panel selection.

• The EMTC  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 EMTC  system operation is determined by the settings on the HVAC module - EMTC  . The EMTC  system is composed of the HVAC module - EMTC  , blower motor resistor, mode door actuator, air inlet door actuator and temperature blend door actuator to control the various functions.

The blower motor switch:

• sets the blower motor speed.
• directs the blower motor path to ground through the blower motor resistor to allow blower motor operation in LO, MED-LO and MED-HI.
• directs the blower motor path directly to ground, bypassing the blower motor resistor, to allow blower motor operation in HI.

The A/C request button:

• can request the A/C compressor ON when the function selector switch is in PANEL, FLOOR/PANEL and FLOOR and when the A/C request switch is pressed. Indicator illuminates when A/C request switch is toggled ON.
• 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 can be toggled ON or OFF in FLOOR/DEFROST and DEFROST. 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 HVAC module - EMTC  .

The function selector switch:

• selects airflow direction.
• is serviced only with the HVAC module - EMTC  .

The temperature selector:

• selects fill WARM and full COOL as well as blended outlet temperatures.
• is serviced only with the HVAC module - EMTC  .

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 HVAC module - EMTC  .
• my be a timed function in FLOOR/DEFROST and DEFROST.

The auxiliary climate controls:

• select the auxiliary blower motor speed.
• select the auxiliary airflow mode/temperature.

The HVAC module - EMTC  also includes:

• a rear window defrost button, refer to WINDOWS & GLASS - GLASS, FRAMES & MECHANISMS .
• heated/cooled seat controls, refer to SEAT SYSTEM .