Climate Control System: Overview Lincoln Aviator I

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

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. effects of pressure

Normal Operation

Under normal operation, the driver side (LH) and passenger side (RH) temperature blend door actuator motors are supplied voltage or ground on circuit 291 (BK) (LH) or circuit 299 (DG) (RH), depending on desired actuator rotation, by the Dual Automatic Temperature Control (DATC) module. The DATC module then supplies the appropriate voltage or ground to the other side of the actuator motor on circuit 290 (GY) (LH) or circuit 300 (OG) (RH).

The driver side (LH) and passenger side (RH) temperature blend door actuator feedback resistors are supplied a ground from the DATC module by circuit 780 (DB) and a 5 volt reference voltage on circuit 292 (BN). The DATC module reads the voltage on circuit 114 (LB/YE) (LH) or circuit 115 (LG/BK) (RH) to determine the actuator position by the position of the actuator feedback resistor wiper arm.

Under normal operation, the in-vehicle air temperature sensor receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 470 (PK/BK)/3051 (BK/YE). A 5 volt reference voltage is supplied to the in-vehicle air temperature sensor from the DATC module through circuit 3050 (WH/OG).

Under normal operation, the ambient air temperature sensor receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 470 (PK/BK)/233 (DB/YE). A 5 volt reference voltage is supplied to the ambient air temperature sensor from the DATC module through circuit 234 (DB/WH).

Under normal operation, the solar radiation sensor receives a ground through circuit 1205 (BK). A 5 volt reference voltage is supplied to the solar radiation sensor from the DATC module through circuit 468 (BN).

Under normal operation, the steering wheel control switch receives a ground from the PCM through circuit 848 (DG/OG). The DATC module senses the resistance (depending on what button is pressed) from the steering wheel control switch through circuit 3056 (TN/LG).

Under normal operation, the DATC module receives a ground through circuit 1203 (BK/LB). The DATC module is supplied constant battery voltage through circuit 729 (RD/WH) and ignition switched voltage through circuit 1003 (GY/YE).

Note. For a complete explanation of the DATC system functions, REFER to DESCRIPTION AND OPERATION .

Under normal operation, the DATC module receives a ground through circuit 1203 (BK/LB). The DATC module is supplied constant battery voltage through circuit 729 (RD/WH) and ignition switched voltage through circuit 1003 (GY/YE).

Under normal operation, the Automatic Temperature Control (ATC) solenoid and manifold receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 1070 (BN/LB). Depending on which solenoid is to be energized, the ATC solenoid and manifold receives power from the DATC module through circuits

1. 1501 (BK) for the air inlet door vacuum control motor.
2. 1502 (BK/YE) for the defrost door vacuum control motor.
3. 1503 (BK/LB) for the floor door vacuum control motor.
4. 1504 (RD/WH) for the panel door vacuum control motor.
5. 1069 (OG/LB) for the heater control valve.

Engine vacuum is supplied to the ATC solenoid and manifold. When one of the solenoids is energized, vacuum is applied to the control motor or valve and the desired door or valve is either opened or closed.

Under normal operation, the Automatic Temperature Control (ATC) solenoid and manifold receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 1070 (BN/LB). When the heater control valve vacuum solenoid is to be energized, the ATC solenoid and manifold receives power from the DATC module through circuit 1069 (OG/LB).

Under normal operation, the Dual Automatic Temperature Control (DATC) module sends a A/C request signal over the communication bus to the PCM. The thermostatic switch and low charge protection switch receive a ground through circuit 570 (BK/WH). The thermostatic switch receives ignition voltage through circuit 1139 (VT/YE). When the thermostatic switch closes, a signal is sent to the PCM through circuit 347 (BK/YE). When the low charge protection switch closes, ground is provided to the high pressure cutoff switch through circuit 439 (TN/LG). When the high pressure cutoff switch closes, a ground signal is received by the PCM through circuit 441 (RD/YE).

The PCM provides a ground for the A/C clutch relay coil through circuit 331 (PK/YE). The A/C clutch relay coil receives ignition voltage through circuit 1139 (VT/YE). Ignition voltage for the A/C clutch relay switch is provided through circuit 1003 (GY/WH). When the relay is activated, ignition voltage is supplied to the A/C clutch solenoid through circuit 321 (GY/WH). Ground is supplied for the A/C clutch through circuit 1205 (BK).

Under normal operation, the Dual Automatic Temperature Control (DATC) module sends a A/C request signal over the communication bus to the PCM. The thermostatic switch and low charge protection switch receive a ground through circuit 570 (BK/WH). The thermostatic switch receives ignition voltage through circuit 1139 (VT/YE). When the thermostatic switch closes, a signal is sent to the PCM through circuit 347 (BK/YE). When the low charge protection switch closes, ground is provided to the high pressure cutoff switch through circuit 439 (TN/LG). When the high pressure cutoff switch closes, a ground signal is received by the PCM through circuit 441 (RD/YE).

The PCM provides a ground for the A/C clutch relay coil through circuit 331 (PK/YE). The A/C clutch relay coil receives ignition voltage through circuit 1139 (VT/YE). Ignition voltage for the A/C clutch relay switch is provided through circuit 1003 (GY/WH). When the relay is activated, ignition voltage is supplied to the A/C clutch solenoid through circuit 321 (GY/WH). Ground is supplied for the A/C clutch through circuit 1205 (BK).

Under normal operation, the blower motor relay coil receives a ground through circuit 1205 (BK). The coil receives voltage from the DATC module through circuit 575 (YE/BK) when the DATC is ON. Voltage is supplied to the relay contacts from circuit 538 (GY/RD). When the relay coil is energized, voltage is delivered to the blower motor through circuit 371 (PK/WH). Ground for the motor is provided through circuit 536 (BK/LG) from the blower control module. Ground for the blower control module is provided by circuit 1205 (BK).

Under normal operation, the blower motor control module receives a 1-2 volt signal from the DATC module through circuit 776 (OG/BK) to determine the desired blower motor speed. The DATC module receives a feedback voltage from the blower motor control module through circuit 937 (RD/WH) to determine actual blower motor speed. When the highest blower motor setting is selected, the DATC module sends 12 volts to the blower control module through circuit 755 (BN/WH).

Under normal operation, the auxiliary blower motor relay coil receives a ground through circuit 1205 (BK). The coil receives voltage from circuit 575 (YE/BK) when the DATC is ON. Voltage is supplied to the relay contacts from circuit 181 (BR/OG). When the relay coil is energized, voltage is delivered to the blower motor through circuit 371 (PK/WH). Ground for the motor is provided through circuit 515 (OG/RD) from the resistor and switches. Ground for the resistor and switches are provided by circuit 1205 (BK).

Under normal operation, the blower motor is provided a ground from the resistor through circuit 515 (OG/RD). The resistor gets a ground from the front auxiliary blower switch, depending on selected speed, through circuit 261 (OG/BK), 269 (LB/OG) or circuit 260 (RD/OG).

Under normal operation, the blower motor is provided a ground from the resistor through circuit 515 (OG/RD). The resistor gets a ground from the rear auxiliary blower switch, depending on selected speed, through circuit 261 (OG/BK), 269 (LB/OG) or circuit 260 (RD/OG). In the HI blower selection, the switch provides ground directly to the motor through circuit 515 (OG/RD). The rear auxiliary blower switch is provided ground from the front auxiliary blower switch, through circuit 1121 (DG/YE), when the REAR position is selected.

Under normal operation, the auxiliary mode door actuator motor is driven to the floor position by supplying voltage to the motor on circuit 1128 (GY/LB) and ground to circuit 1129 (BN/WH).

The auxiliary mode door actuator motor is driven to the panel position by supplying voltage to the motor on circuit 1129 (BN/WH) and ground to circuit 1128 (GY/LB).

Under normal operation, the auxiliary mode door actuator motor is driven to the floor position by supplying voltage to the front auxiliary mode control switch on circuit 1131 (LG) and ground to circuit 1124(WH).

The auxiliary mode door actuator motor is driven to the panel position by supplying voltage to the front auxiliary mode control switch on circuit 1124(WH) and ground to circuit 1131 (LG).

Under normal operation, the auxiliary temperature blend door actuator motor is supplied voltage by circuit 1003 (GY/YE) and ground by circuit 1205 (BK). A signal voltage is received by the auxiliary temperature blend door actuator motor from the front auxiliary temperature control through circuit 1125 (BN).

Under normal operation, a signal voltage is received by front auxiliary temperature control from the rear auxiliary temperature control through circuit 1127 (YE).

Under normal operation, the front auxiliary climate control assembly receives voltage from circuit 1003 (GY/YE) and ground from 1205 (BK).

Under normal operation, the rear auxiliary climate control assembly receives voltage from the front auxiliary climate control assembly, when the REAR blower position is selected, through circuit 276 (BN) and ground from 1203 (BK/LB).

Under normal operation, the Automatic Temperature Control (ATC) solenoid and manifold receives a ground from the Dual Automatic Temperature Control (DATC) module through circuit 1070 (BN/LB). When the heater control valve vacuum solenoid is to be energized, the ATC solenoid and manifold receives power from the DATC module through circuit 1069 (OG/LB).