Electronic Manual Temperature Control (EMTC) System

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

• The HVAC module - 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 climate control module. To control the various functions, the EMTC system is composed of the following:

• HVAC module - EMTC
• Blower motor resistor
• Mode door actuator
• Air inlet door actuator
• Temperature blend door actuator

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 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 HVAC module - EMTC.

The function selector:

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

The temperature selector:

• selects full warm and full cool as well as blended outlet temperatures.

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.

The EMTC module also includes:

• a rear window defrost button. Refer to GLASS, FRAMES AND MECHANISMS article.