Climate Control System: Overview Lincoln LS I рестайлинг

Principles of Operation

There are four main principles involved with the basic theory of operation

1. Heat transfer
2. Latent heat of vaporization
3. Relative humidity
4. Effect of pressure on boiling or condensation

Dual Automatic Temperature Control (DATC) Module Description

The DATC system automatically maintains a selected temperature for vehicle interior comfort and regulates the volume of airflow between the instrument panel registers, floor ducts, windshield defroster nozzle, and side window demisters. The system will automatically select between fresh and recirculated air with an optional manual override. The DATC system will also include a manual A/C override, blower speed override, and airflow direction overrides.

The dual temperature zone feature provides the driver and the front seat passenger with their own independent temperature set points. The DATC system provides both the driver and front seat passenger with their selected temperature for interior comfort. In situations where the difference between the driver and the front seat passenger set points are very large, the DATC will tend to favor the driver's setting and make the front seat passenger as comfortable as possible.

The driver and front seat passenger will not have independent air distribution mode or fan controls so the system is dual temperature only. In some cases the passenger temperature set point may influence the air distribution mode or blower speed in automatic mode.

Scheme 1

When AUTO is selected

1. The temperature control setting(s) are manually set to the desired setting(s).
2. The air inlet door actuator is automatically controlled by the DATC module, based on the temperature setting(s), but can be manually overridden by selecting the recirculation button.
3. The panel door, floor door, defrost door and cold air bypass door actuators (if equipped) are automatically controlled by the DATC module based on the temperature setting(s), but can be manually overridden by selecting any of the air distribution buttons.
4. The dual coolant control valve is automatically controlled by the DATC module based on the temperature setting(s).
5. The A/C compressor is automatically controlled by the DATC module based on the temperature setting(s), but can be manually overridden by selecting the A/C button. The A/C compressor will not operate if the outside temperature is lower than approximately 2°C (35°F).
6. The blower motor is on. The blower motor speed is automatically controlled by the DATC module based on the temperature setting(s), but can be manually overridden by adjusting the blower speed rocker button.

Scheme 2

When OFF is selected

1. The air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment.
2. The floor door actuator positions the floor door in the open position, and the panel door actuator, defrost door actuator, and cold air bypass door actuator (if equipped) position the panel door, defrost door, and cold air bypass door (if equipped) in the closed positions. This closes off airflow to the defrost duct, the side window demisters and the instrument panel A/C registers.
3. The dual coolant control valve is in the closed position, preventing the flow of hot coolant to the heater core.
4. The blower motor is off.

Scheme 3

When PANEL is selected

1. The Recirc request button is enabled. If the Recirc request button is selected (indicator on), the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator off), the air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
2. The panel door actuator positions the panel door in the open position and the floor door and defrost door actuators position the floor door and defrost door in the closed position, directing airflow to the instrument panel A/C registers. The cold air bypass door actuator (if equipped) is automatically controlled by the DATC module based on the temperature setting(s).
3. The dual coolant control valve is automatically controlled by the DATC module based on the temperature setting(s).
4. The A/C request button is enabled. When the A/C request button is selected (indicator on), the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F). When the A/C request button is not selected (indicator off), the A/C compressor will not operate and the air cannot be cooled below the outside temperature.
5. The blower motor is on.

Scheme 4

When PANEL/FLOOR is selected

1. The Recirc request button is enabled. If the Recirc request button is selected (indicator on), the air inlet door actuator positions the air inlet door as to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator off), the air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
2. The panel door and floor door actuators position the panel door and floor door in the open position and the defrost door actuator positions the defrost door in the closed position, directing airflow to the instrument panel A/C registers and the floor duct. The cold air bypass door actuator (if equipped) is automatically controlled by the DATC module based on the temperature setting(s).
3. The dual coolant control valve is automatically controlled by the DATC module based on the temperature setting(s).
4. The A/C request button is enabled. When the A/C request button is selected (indicator on), the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F). When the A/C request button is not selected (indicator off), the A/C compressor will not operate and the air cannot be cooled below the outside temperature.
5. The blower motor is on.

Scheme 5

When FLOOR is selected

1. The Recirc request button is enabled. If the Recirc request button is selected (indicator on), the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator off), the air inlet door actuator positions the air inlet door as to admit only outside air into the passenger compartment. The DATC will automatically revert to the outside air position after approximately 1 to 4 minutes to prevent window fogging.
2. The floor door actuator positions the floor door in the open position and the panel door and defrost door actuators position the panel door and defrost door in the closed position, directing airflow to the floor duct. A small amount of airflow from the outboard instrument panel A/C registers will be present. The cold air bypass door actuator (if equipped) is automatically controlled by the DATC module based on the temperature setting(s).
3. The dual coolant control valve is automatically controlled by the DATC module based on the temperature settings.
4. The A/C request button is enabled. When the A/C request button is selected (indicator on), the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F). When the A/C request button is not selected (indicator off), the A/C compressor will not operate and the air cannot be cooled below the outside temperature.
5. The blower motor is on.

Scheme 6

When FLOOR/DEFROST is selected

1. The Recirc request button is enabled. If the Recirc request button is selected (indicator on), the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator off), the air inlet door actuator positions the air inlet door as to admit only outside air into the passenger compartment. The DATC will automatically revert to the outside air position after approximately 1 to 4 minutes to prevent window fogging.
2. The floor door and defrost door actuators position the floor door and defrost door in the open position and the panel door actuator positions the panel door in the closed position, directing airflow to the floor duct, the windshield defroster ducts, and the side window demisters. A small amount of airflow from the outboard instrument panel A/C registers will be present. The cold air bypass door actuator (if equipped) is automatically controlled by the DATC module based on the temperature setting(s).
3. The dual coolant control valve is automatically controlled by the DATC module based on the temperature settings.
4. The A/C request button is enabled. When the A/C request button is selected (indicator on), the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F). When the A/C request button is not selected (indicator off), the A/C compressor will not operate and the air cannot be cooled below the outside temperature.
5. The blower motor is on.

Scheme 7

When DEFROST is selected

1. The Recirc request button is disabled. The air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
2. The defrost door actuator positions the defrost door in the open position and the panel door, floor door, and cold air bypass door actuators (if equipped) position the panel door, floor door, and cold air bypass door (if equipped) in the closed position, directing airflow to the windshield defroster ducts and the side window demisters. A small amount of airflow from the outboard instrument panel A/C registers will be present.
3. The dual coolant control valve is automatically controlled by the DATC module based on the temperature settings.
4. The A/C request button is disabled. To reduce fogging, the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F).
5. The blower motor is on.

Scheme 8

Scheme 9

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Scheme 10

Normal Operation

Under normal operation, the Dual Automatic Temperature Control (DATC) module receives battery voltage through circuit 29-FA10 (OG/GN) and ignition voltage through circuit 20-FA10 (PK/OG). A ground is provided for the DATC module through circuit 31-FA10 (BK).

Under normal operation, the Dual Automatic Temperature Control (DATC) module receives battery voltage through circuit 29-FA10 (OG/GN) and ignition voltage through circuit 20-FA10 (PK/OG). A ground is provided for the DATC module through circuit 31-FA10 (BK).

Under normal operation, to open the mode doors, the DATC module supplies the cold air bypass, air inlet, defrost, panel mode and floor mode door actuator motors voltage through the door actuator open circuits and ground through the door actuator close circuits. To close the mode doors, the DATC module reverses the voltage and ground circuits.

The mode door actuator feedback resistors are supplied a ground from the DATC module by the mode door actuator return circuits and a 5-volt reference voltage on the mode door actuator reference circuits. The DATC module reads the voltage on the mode door actuator feedback circuits to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.

Door Actuator Open Circuits

1. Cold air bypass - 32-FB2 (WH/RD)
2. Air inlet - 32-FB8 (WH/RD)
3. Defrost - 32-FB5 (WH/BK)
4. Panel mode - 32-FB7 (WH)
5. Floor mode - 32-FB6 (WH/VT)

Door Actuator Close Circuits

1. Cold air bypass - 33-FB2 (YE/RD)
2. Air inlet - 33-FB8 (YE/RD)
3. Defrost - 33-FB5 (YE/BK)
4. Panel mode - 33-FB7 (YE)
5. Floor mode - 33-FB6 (YE/VT)

Door Actuator Return Circuits

1. Cold air bypass - 9-FB2 (BN/RD)
2. Air inlet - 9-FB8 (BN/RD)
3. Defrost - 9-FB5 (BN/YE)
4. Panel mode - 9-FB7 (BN)
5. Floor mode - 9-FB6 (BN/WH)

Door Actuator Reference Circuits

1. Cold air bypass - 7-FB2 (YE/RD)
2. Air inlet - 7-FB8 (YE/RD)
3. Defrost - 7-FB5 (YE/BK)
4. Panel mode - 7-FB7 (YE)
5. Floor mode - 7-FB6 (YE/VT)

Door Actuator Feedback Circuits

1. Cold air bypass - 8-FB2 (WH/RD)
2. Air inlet - 8-FB8 (WH/RD)
3. Defrost - 8-FB5 (WH/BK)
4. Panel mode - 8-FB7 (WH)
5. Floor mode - 8-FB6 (WH/VT)

Under normal operation, the in-vehicle temperature sensor receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 9-FA48 (BN/GN). A 5-volt reference voltage is supplied to the in-vehicle temperature sensor from the DATC module through circuit 8-FA48 (WH/GN)

Under normal operation, the LH and RH discharge temperature sensors receive a ground from the Dual Automatic Temperature Control (DATC) module through circuit (LH) 9-FA47 (BN/GN)/9-FA3 (BN/BL) and (RH) 9-FA51 (BN/YE)/9-FA3 (BN/BL). The evaporator discharge temperature sensor receives a ground from the DATC module through circuit 9-FA44 (BN/RD).

A 5-volt reference voltage is supplied to the LH and RH discharge temperature sensors from the DATC module through circuits (LH) 8-FA47 (WH/GN) and (RH) 8-FA51 (WH/BK). A 5-volt reference voltage is supplied to the evaporator discharge temperature sensor from the DATC module through circuit 8-FA44 (WH/RD).

Under normal operation, the ambient air temperature sensor receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 9-FA49 (BN/WH). A 5-volt reference voltage is supplied to the ambient air temperature sensor from the DATC module through circuit 8-FA49 (WH/VT).

Under normal operation, the solar radiation sensor receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 9-FA53 (BN/BL)/9-FA3 (BN/BL). A 5-volt reference voltage is supplied to the solar radiation sensor from the DATC module through circuits 8-FA53 (WH/BL) and 10-FA53 (GY/VT).

Under normal operation, the coolant control valve receives battery voltage through circuit 30-FB3 (RD/OG). The coolant control valve is provided a ground through circuit 91S-FB3 (BN/BL) and/or 91S-FB4 (BN/GN) from the Dual Automatic Temperature Control (DATC) module, depending on which side of the heater core warm coolant is to flow through.

Under normal operation, the auxiliary coolant pump relay coil receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 91S-FA76 (BN/BL). The Coil receives battery voltage through circuit 30-FA74 (RD/GN). Battery voltage is supplied to the relay contacts from circuit 30-FA74 (RD/GN). When the relay coil is energized, voltage is delivered to the auxiliary coolant pump motor through circuit 30S-FB1 (RD/YE). Ground for the motor is provided through circuit 31-FB1 (BK/YE).

Under normal operation, the coolant control valve receives battery voltage through circuit 30-FB3 (RD/OG)/30-FA1 (RD). The coolant control valve is provided a ground through circuit 91S-FB3 (BN/BL) and/or 91S-FB4 (BN/GN) from the Dual Automatic Temperature Control (DATC) module, depending on which side of the heater core the warm coolant is to flow through.

Under normal operation, the auxiliary coolant pump relay coil receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 91S-FA76 (BN/BL). The Coil receives battery voltage through circuit 30-FA74 (RD/GN). Battery voltage is supplied to the relay contacts from circuit 30-FA74 (RD/GN). When the relay coil is energized, voltage is delivered to the auxiliary coolant pump motor through circuit 30S-FB1 (RD/YE). Ground for the motor is provided through circuit 31-FB1 (BK/YE).

Under normal operation, the LH and RH discharge temperature sensors receive a ground from the Dual Automatic Temperature Control (DATC) module through circuit (LH) 9-FA47 (BN/GN)/9-FA3 (BN/BL) and (RH) 9-FA51 (BN/YE)/9-FA3 (BN/BL). A 5-volt reference voltage is supplied to the LH and RH discharge temperature sensors from the DATC module through circuits (LH) 8-FA47 (WH/GN) and (RH) 8-FA51 (WH/BK).

Under normal operation, when the Powertrain Control Module (PCM) receives an A/C request signal from the DATC module, the PCM provides a ground for the A/C clutch relay coil through circuit 91S-FA79 (BN/BL). The A/C clutch relay coil receives ignition voltage through circuit 15S-FA79 (GN/RD). The relay switch receives battery voltage through circuit 30-FA79 (RD/OG). When the relay coil is grounded, voltage is delivered through circuit 15-FA6 (GN/YE) to the A/C compressor clutch field coil. Ground for the A/C compressor clutch field coil is provided through circuit 31-FA6 (BK/YE).

Under normal operation, when the Powertrain Control Module (PCM) receives an A/C request signal from the DATC module, the PCM provides a ground for the A/C clutch relay coil through circuit 91S-FA79 (BN/BL). The A/C clutch relay coil receives ignition voltage through circuit 15S-FA79 (GN/RD). The relay switch receives battery voltage through circuit 30-FA79 (RD/OG). When the relay coil is grounded, voltage is delivered through circuit 15-FA6 (GN/YE) to the A/C compressor clutch field coil. Ground for the A/C compressor clutch field coil is provided through circuit 31-FA6 (BK/YE).

Under normal operation, the blower motor relay coil receives a ground from the DATC module through circuit 31S-FA23 (BK/BU). The coil receives voltage through circuit 30-FA24 (RD/OG). Voltage is supplied to the relay contacts from circuit 30-FA24 (RD/OG). When the relay coil is energized, voltage is delivered to the blower motor through circuit 30S-FA18 (RD/BK). Ground for the motor is provided through circuit 31S-FA18 (BK/RD) from the blower control module. Ground for the blower control module is provided by circuit 31-FA45 (BK). The DATC module sends a 0-volt (LO) to 5-volt (HI) signal to the blower control module through circuit 8-FA45 (BN/BU) to control the blower speed.

Under normal operation, the blower motor relay coil receives a ground from the DATC module through circuit 31S-FA23 (BK/BU). The coil receives voltage through circuit 30-FA24 (RD/OG). Voltage is supplied to the relay contacts from circuit 30-FA24 (RD/OG). When the relay coil is energized, voltage is delivered to the blower motor through circuit 30S-FA18 (RD/BK). Ground for the motor is provided through circuit 31S-FA18 (BK/RD) from the blower control module. Ground for the blower control module is provided by circuit 31-FA45 (BK). The DATC module sends a 0-volt (LO) to 5-volt (HI) signal to the blower control module through circuit 8-FA45 (BN/BU) to control the blower speed.

Refrigerant Identification Testing Procedure

1. Follow the instructions included with the Deluxe Refrigerant Diagnostic Tool to obtain the sample for testing.
2. The diagnostic tool will display one of the following: If the purity level of R-134a or R-12 is 98% or greater by weight, the green "PASS" light emitting diode (LED) will light. The weight concentrations of R-134a, R-12, R-22, hydrocarbons, and air will be displayed on the digital display. If refrigerants R-134a or R-12 do not meet the 98% purity levels, the red "FAIL" LED will light and a horn will sound alerting the user of potential hazards. The weight concentrations of R-134a, R-12, R-22, and hydrocarbons will be displayed on the digital display. If hydrocarbon concentrations are 2% or greater by weight, the red "FAIL" LED will light, "Hydrocarbon High" will be displayed on the digital display, and a horn will sound alerting the user of potential hazards. The weight concentrations of R-134a, R-12, R-22, and hydrocarbons will also be displayed on the digital display.
3. The percentage of air contained in the sample will be displayed if the R-134a or R-12 content is 98% or greater. The diagnostic tool eliminates the effect of air when determining the refrigerant sample content because air is not considered a contaminant, although air can affect A/C system performance. When the diagnostic tool has determined that a refrigerant source is pure (R-134a or R-12 is 98% or greater by weight) and air concentration levels are 2% or greater by weight, the diagnostic tool will prompt the user if an air purge is desired.
4. If contaminated refrigerant is detected, repeat the refrigerant identification test to verify that the refrigerant is indeed contaminated.
5. Recover any contaminated refrigerant using suitable recovery-only equipment designed for capturing and storing contaminated refrigerant. For additional information, refer to «CONTAMINATED REFRIGERANT HANDLING»(ref-207561-S16445896382005113000000) .