Controls - Front: Other Dodge Durango II

A/C COMPRESSOR CLUTCH COIL

The A/C compressor clutch coil electrical circuit is controlled by the powertrain control module (PCM) through the A/C compressor clutch relay, which is located in the power distribution center (PDC) in the engine compartment. Begin testing of a suspected compressor clutch coil problem by performing the preliminary checks.

PRELIMINARY CHECKS

1. If the compressor clutch will not engage, refer to «HVAC - ELECTRICAL DIAGNOSTICS»(ref-212849) to perform the A/C System Performance Test, which is found within the HVAC System Test. If no diagnostic trouble codes (DTCs) are found in the A/C-heater control or the powertrain control module (PCM), go to Step 2. If any DTCs are found, repair as required.
2. If the compressor clutch still will not engage, verify the refrigerant charge level (Refer to «REFRIGERANT SYSTEM LEAKS»(ref-212855-S41902800042005122700000) ). If the refrigerant charge level is OK, go to «TESTS»(ref-212851-S40326956362005122700000) . If the refrigerant charge level is not OK, adjust the refrigerant charge as required.

TESTS

1. Verify the battery state of charge (Refer to «BATTERY SYSTEM»(ref-212766) ).
2. Connect an ammeter (0 to 10 ampere scale selected) in series with the clutch coil feed terminal. Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the clutch coil.
3. With the heater-A/C control in the A/C mode and the blower at low speed, start the engine and allow it to run at a normal idle speed.
4. The compressor clutch should engage immediately, and the clutch coil supply voltage should be within two volts of the battery voltage. If the coil supply voltage is OK, go to Step 5. If the coil supply voltage is not within two volts of battery voltage, test the clutch coil feed circuit for excessive voltage drop and repair as necessary.
5. Refer to the «A/C CLUTCH COIL CURRENT DRAW CHART»(ref-212851-S34189162602005122700000) for the acceptable A/C clutch coil current draw specifications. Specifications apply for a work area temperature of 21°C (70°F). If voltage is more than 12.5 volts, add electrical loads by turning on electrical accessories until voltage reads below 12.5 volts. If the compressor clutch coil current reading is zero, the coil is open and must be replaced. If the compressor clutch coil current reading is above specifications, the coil is shorted and must be replaced.

A/C CLUTCH COIL CURRENT DRAW

A/C CLUTCH COIL CURRENT DRAW CHART

A/C CLUTCH BREAK-IN

After a new A/C compressor clutch has been installed, cycle the compressor clutch approximately twenty times (five seconds on, then five seconds off). During this procedure, set the A/C-heater controls to the A/C Recirculation Mode, the blower motor in the highest speed position, and the engine speed at 1500 to 2000 rpm. This procedure (burnishing) will seat the opposing friction surfaces and provide a higher compressor clutch torque capability.

MANUAL SINGLE ZONE

The A/C-heater control (1) for the manual temperature control (MTC) single zone heating-A/C system allows one temperature setting for the entire vehicle. All controls are identified by ISO graphic symbols.

The A/C-heater control and integral computer is located in the instrument panel and contains

Scheme 332

1. a rotary control knob for rear window washer operation and rear window wiper speed selection (2).
2. a slider control knob for temperature control of the discharged air (3).
3. a rotary control knob for fan speed selection and turning the heater-A/C system off (4).
4. a rotary control knob for mode control of the discharged air (5).
5. a push button A/C on/off control (6). The Snowflake button contains an LED that illuminates when the A/C system is in operation.
6. a push button rear window defogger on/off control (7). The button contains an LED that illuminates when the rear window defogger system is in operation.

The A/C-heater control cannot be repaired and, if faulty or damaged, it must be replaced. The illumination lamps (8) and control knobs are available for service replacement.

The A/C-heater control for the manual single zone heating and A/C system is diagnosed using a scan tool. Refer to HVAC - ELECTRICAL DIAGNOSTICS for more information.

The A/C-heater control utilizes integrated circuitry and information carried on the controller area network (CAN) B bus to monitor many sensors and switch inputs throughout the vehicle. In response to those inputs, the internal circuitry and programming of the A/C-heater control allows it to control electronic functions and features of the MTC heating-A/C system.

The inputs received by the A/C-heater control of the MTC heating-A/C system on the CAN B bus are as follows

1. Dimming
2. Refrigerant Pressure
3. Vehicle Identification Number
4. Vehicle Odometer
5. Engine Coolant Temperature
6. Ambient Air Temperature
7. Vehicle Speed

The messages broadcasted by the A/C-heater control of the MTC heating-A/C system on the CAN B bus are as follows

1. A/C Request
2. A/C Select
3. Rear Window Defogger (EBL) Request
4. Rear Washer Request
5. Rear Wiper Request

MANUAL SINGLE ZONE WITH REAR HEAT AND A/C

The A/C-heater control (1) for the manual temperature control (MTC) single zone front and rear heating-A/C system allows both the front and intermediate seat passengers the ability to regulate air temperature as well as fan speed and provides floor outlets near the right rear door and overhead outlets at each intermediate outboard seating position. Primary control for the rear blower motor is on the front A/C-heater control. All controls are identified by ISO graphic symbols.

FRONT CONTROL PANEL

The front A/C-heater control and integral computer is located in the instrument panel and contains

Scheme 333

1. a rotary control knob for rear window washer operation and rear window wiper speed selection (2).
2. a slider control knob for temperature control of the discharged air (3).
3. a rotary control knob for fan speed selection and turning the heater-A/C system off (4).
4. a rotary control knob for rear fan speed selection and turning the rear heater-A/C system off (5).
5. a rotary control knob for mode control of the discharged air (6).
6. a push button A/C on/off control (7). The Snowflake button contains an LED that illuminates when the A/C system is in operation.
7. a push button rear window defogger on/off control (8). The button contains an LED that illuminates when the rear window defogger system is in operation.

The front A/C-heater control cannot be repaired and, if faulty or damaged, it must be replaced. The illumination lamps (9) and control knobs are available for service replacement.

The A/C-heater control for the MTC single zone heating-A/C system is diagnosed using a scan tool. Refer to HVAC - ELECTRICAL DIAGNOSTICS for more information.

The A/C-heater control utilizes integrated circuitry and information carried on the controller area network (CAN) B bus to monitor many sensors and switch inputs throughout the vehicle. In response to those inputs, the internal circuitry and programming of the A/C-heater-control allows it to control electronic functions and features of the MTC heating-A/C system.

The inputs received by the A/C-heater control of the MTC heating-A/C system on the CAN B bus are as follows

1. Dimming
2. Refrigerant Pressure
3. Vehicle Identification Number
4. Vehicle Odometer
5. Engine Coolant Temperature
6. Ambient Air Temperature
7. Vehicle Speed

The messages broadcasted by the A/C-heater control of the MTC heating-A/C system on the CAN B bus are as follows

1. A/C Request
2. A/C Select
3. Rear Window Defogger (EBL) Request
4. Rear Washer Request
5. Rear Wiper Request

REAR CONTROL PANEL

The rear A/C-heater control (1) is located at the rear of the center floor console (2) and allows intermediate seat passengers to adjust rear air distribution, temperature and blower motor speed when the center control knob on the front A/C-heater control (3) is set to the Rear position (Refer to CONTROL-A/C-HEATER ).

Scheme 334

AUTOMATIC SINGLE ZONE WITH REAR HEAT AND A/C

The A/C-heater control (1) for the automatic temperature control (ATC) single zone front and rear heating-A/C system allows both the front and intermediate seat passengers the ability to automatically or manually regulate air temperature as well as fan speed and provides floor outlets near the right rear door and overhead outlets at each rear intermediate outboard seating position. Primary control for the rear blower motor is on the front A/C-heater control. All controls are identified by ISO graphic symbols.

The front A/C-heater control and integral computer is located in the instrument panel and contains

Scheme 335

1. a push button Auto mode control (2).
2. a rocker switch control that selects comfort temperatures from 15° to 29°C (60° to 85°F) (3). Comfort temperatures are shown in the vacuum-flourescent (VF) digital display (4). If the set temperature is 15°C (60°F) and down (-) is pressed, the A/C-heater control will attempt to achieve the lowest temperature possible, but the display will show LO. If the set temperature is 29°C (85°F) and up (+) is pressed, the A/C-heater control will attempt to achieve the highest temperature possible, but the display will show HIGH. Temperatures can be displayed in either Metric or Fahrenheit, which is selected from the overhead console.
3. a push button on/off control which allows the system to be completely turned off (5). The display is blank when the heater-A/C system is off, except for the electric backlight (EBL) symbol, if EBL is on.
4. a push button A/C on/off control (6). An ISO Snowflake symbol appears in the display when the A/C system is in operation, whether under manual or automatic control.
5. a push button air recirculation control (7). An ISO Recirculation symbol appears in the display when the button is pressed, or when the system exceeds 80 percent circulated air under automatic control due to high A/C demand.
6. five push button mode controls (8). An ISO mode symbol appears in the display to show the current mode setting when each button is manually pressed or selected by Auto mode.
7. a push button rear window defogger on/off control (9). An ISO symbol appears in the display when the rear window defogger system is in operation. The ISO symbol will appear on the display even with the heating-A/C system turned off.
8. a rotary control knob for rear window washer operation and rear window wiper speed selection (10).
9. a rocker switch control for front fan speed selection that can override the automatic controls (11).
10. a push button control for the rear heating-A/C system (12).
11. computer logic that remembers the settings of the controls when the ignition is turned off and retains those settings after a restart. If the system is off when the ignition is turned off it will be off when the engine is restarted, etc.
12. computer logic that provides variable air recirculation under high temperature and humidity conditions. Because recirculation is generally accompanied by increased fan noise, the proportion of recirculated to outside air gradually approaches full recirculation over a broad temperature range.

The front A/C-heater control cannot be repaired and, if faulty or damaged, it must be replaced. The illumination lamps (13) and the wiper/wash control knob are available for service replacement.

The A/C-heater control for the ATC single zone front and rear heating-A/C system is diagnosed using a scan tool. Refer to HVAC - ELECTRICAL DIAGNOSTICS for more information.

The A/C-heater control utilizes integrated circuitry and information carried on the controller area network (CAN) B bus to monitor many sensors and switch inputs throughout the vehicle. In response to those inputs, the internal circuitry and programming of the A/C-heater control allows it to control electronic functions and features of the ATC heating-A/C system.

The inputs received by the A/C-heater control of the ATC heating-A/C system on the CAN B bus are as follows

1. Dimming
2. Refrigerant Pressure
3. Vehicle Identification Number
4. Vehicle Odometer
5. Engine Coolant Temperature
6. Ambient Air Temperature
7. Infrared Temperature Sensor
8. Ignition Voltage
9. Vehicle Speed

The messages broadcasted by the A/C-heater control of the ATC heating-A/C system on the CAN B bus are as follows

1. A/C Request
2. A/C Select
3. Rear Window Defogger (EBL) Request
4. Rear Washer Request
5. Rear Wiper Request

The rear A/C-heater control (1) is located at the rear of the center floor console (2) and allows intermediate seat passengers to adjust rear temperature and blower motor speed when the center control knob on the front A/C-heater control (3) is set to the Rear position (Refer to CONTROL-A/C-HEATER ).

Scheme 336

RESISTOR BLOCK-BLOWER MOTOR - FRONT

For circuit descriptions and diagrams, refer to SYSTEM WIRING DIAGRAMS . The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

1. Disconnect and isolate the negative battery cable.
2. Disconnect the wire harness connector from the blower motor resistor block (Refer to «REMOVAL»(ref-212851-S26949813122005122700000) ).
3. Check for continuity between each of the blower motor switch input terminals of the blower motor resistor block and the resistor output terminal. In each case there should be continuity. If OK, repair the wire harness circuits between the blower motor switch and the blower motor resistor block or blower motor as required. If not OK, replace the faulty blower motor resistor block.

ELECTRIC A/C CONDENSER COOLING FAN SWITCH POINT

ELECTRIC A/C CONDENSER COOLING FAN SWITCH POINT