Alfa Romeo GT 1.8 T.SPARK – AIR CONDITIONING – – Two-zone climate control system – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

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Wiring diagram - AIR CONDITIONING - Alfa Romeo GT 1.8 T.SPARK

AIR CONDITIONING - WIRING DIAGRAM Alfa Romeo GT 1.8 T.SPARK

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Components - AIR CONDITIONING - Alfa Romeo GT 1.8 T.SPARK

Component code	Name	Assembly reference
B1	JUNCTION UNIT	-
B1	JUNCTION UNIT
B1	JUNCTION UNIT
B2	JUNCTION UNIT UNDER DASHBOARD
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C10	FRONT LEFT EARTH ( FRONT )	-
C15	FACIA EARTH, DRIVER''S SIDE	-
C16	AIR CONDITIONING EARTH ( CONNECTORS )	-
C38	EARTH ON TUNNEL	-
D6	REAR / ENGINE COMPARTMENT JUNCTION	-
D8	FRONT/AIR CONDITIONING - HEATER COUPLING	-
D30	REAR COUPLING FOR /FRONT DOOR. DRIVER''S SIDE	-
D97	SHORT CIRCUITING COUPLING	-
H44	ELECTRIC WINDOWS CONTROLS ASSEMBLY ON DRIVER''S DOOR
K3	MISTING SENSOR ( REAR )	-
K64	EXHAUST GAS SENSOR ( FRONT )
K87	TREATED AIR SENSOR
K88	UPPER TREATED AIR SENSOR
K89	PASSENGER COMPARTMENT AIR TEMPERATURE SENSOR ( CONNECTORS )
K90	SOLAR SENSOR
M1	BODY COMPUTER
M70	CLIMATE CONTROL SYSTEM CONTROL UNIT
M72	FAN SPEED'' VARIATOR
N78	LEFT AIR MIXTURE FLAP ACTUATOR ( CONNECTORS )
N79	RIGHT AIR MIXTURE FLAP ACTUATOR
N80	AIR DISTRIBUTION FLAP ACTUATOR (MOTOR)
N82	OUTSIDE / RECIRCULATION AIR INTAKE FLAP ACTUATOR
N85	PASSENGER COMPARTMENT VENTILATION FAN ( CONNECTORS )
P60	LEFT DOOR MIRROR

Location of components - AIR CONDITIONING - Alfa Romeo GT 1.8 T.SPARK

AIR CONDITIONING - LOCATION OF COMPONENTS Alfa Romeo GT 1.8 T.SPARK

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Components - AIR CONDITIONING - Alfa Romeo GT 1.8 T.SPARK

Component code	Name	Assembly reference
B1	JUNCTION UNIT	-
B1	JUNCTION UNIT
B1	JUNCTION UNIT
B2	JUNCTION UNIT UNDER DASHBOARD
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C10	FRONT LEFT EARTH ( FRONT )	-
C15	FACIA EARTH, DRIVER''S SIDE	-
C16	AIR CONDITIONING EARTH ( CONNECTORS )	-
C38	EARTH ON TUNNEL	-
D6	REAR / ENGINE COMPARTMENT JUNCTION	-
D8	FRONT/AIR CONDITIONING - HEATER COUPLING	-
D30	REAR COUPLING FOR /FRONT DOOR. DRIVER''S SIDE	-
D97	SHORT CIRCUITING COUPLING	-
H44	ELECTRIC WINDOWS CONTROLS ASSEMBLY ON DRIVER''S DOOR
K3	MISTING SENSOR ( REAR )	-
K64	EXHAUST GAS SENSOR ( FRONT )
K87	TREATED AIR SENSOR
K88	UPPER TREATED AIR SENSOR
K89	PASSENGER COMPARTMENT AIR TEMPERATURE SENSOR ( CONNECTORS )
K90	SOLAR SENSOR
M1	BODY COMPUTER
M70	CLIMATE CONTROL SYSTEM CONTROL UNIT
M72	FAN SPEED'' VARIATOR
N78	LEFT AIR MIXTURE FLAP ACTUATOR ( CONNECTORS )
N79	RIGHT AIR MIXTURE FLAP ACTUATOR
N80	AIR DISTRIBUTION FLAP ACTUATOR (MOTOR)
N82	OUTSIDE / RECIRCULATION AIR INTAKE FLAP ACTUATOR
N85	PASSENGER COMPARTMENT VENTILATION FAN ( CONNECTORS )
P60	LEFT DOOR MIRROR

Description - AIR CONDITIONING - Alfa Romeo GT 1.8 T.SPARK

An automatic system manages the passenger compartment climate control, i.e. temperature and ventilation with recirculation and air flow orientation, with separate management of the temperature for the left and right hand sides of the passenger compartment.A dedicated control unit manages system operation by controlling:air temperature at the driver/passenger vents;air distribution to the vents;fan speed (varies continuously);activation of the compressor (air cooling circuit);activation of air recirculation;the MAX-DEF fast defrost function (i.e. a set of actions which allow both the windscreen and the rearscreen to be demisted quickly);The control unit sets the above parameters in order to adjust passenger compartment temperature to the required level. The system controls are located outside the control unit housing.The following parameters/functions can be modified manually:fan speed;distribution direction;compressor disablement;defrosting/demisting:recirculation.Manual selections always take precedence over automatic selections and are stored until the user deliberately cancels the command, allowing the automatic device to take control over the relevant function.The control unit downloads information on interior and exterior temperature and climatic conditions via special sensors.exterior temperature sensor, locate on the driver''s side door mirror. The sensor reading is downloaded by a control unit on the door and filtered as necessary; it is then sent via the CAN network to the climate control system ECU (to instrument panel and other appliances).lower mixed air temperature sensor (right and left);upper mixed air sensors (right and left);passenger compartment temperature sensor;sunlight sensor, which measures the sun''s rays on the windscreen;exhaust gas presence sensor (A.Q.S.: Air Quality Sensor):supplies a signal when the air pollution index exceeds a preset level of harmfulness. This signal turns on the recirculation to prevent polluted air entering the passenger compartment;demisting sensor, which detects the presence of water droplets (mist) on the inner surface of the windscreen; this information turns on the relevant demisting strategy., which alters the air and ventilation distribution pattern.After processing the information, it adjusts passenger compartment air intake speed by means of the fan motor and air temperature by means of two mixer actuators (one for the right side and one for the left). It also controls flow distribution via another actuator and - lastly - the interior/exterior air recirculation function via a final actuator.When required, the ECU automatically activates the cooling circuit and dehumidifies the air by operating the air conditioner compressor.For more details.The vehicle speed signal - received by the CAN network - is used to filter outdoor temperature and adjust ventilation and the dynamic air intake according to car speed.The body computer continually downloads a battery voltage signal for comparison with its limit value. If the recorded battery voltage is lower than the threshold, the computer cuts in via the CAN network to send a signal to disable a series of appliances: this includes the fan control.The climate control system ECU is supplied by an ignition-operated line protected by a fuse in the underfacia control unit; the fan is supplied by a line protected by a specific engine bay control unit fuse.

Functional description - AIR CONDITIONING - Alfa Romeo GT 1.8 T.SPARK

Climate control control unitM70 is supplied when the ignition is turned on (INT/A) at pin 25 of a line protected by fuse F31 from underfacia junction unit B2. ; it is supplied directly at pin 31 from a line protected by fuse F39 of underfacia control unitB2. The supply for lighting the controls with the side lights on reaches pin 24 from the line protected by fuse F35 of underfacia control unitB2. Pin 21 ofM70 is earthed.Control unitM70 is also connected to sensors K87 (right lower treated air - connector B - and left - connector A), K88 (right upper treated air - connector B - and left - connector A); these sensors receive a reference earth from pin 32 and send signals to pins 19, 20, 29 and 30 of M70. Passenger comparment air sensor K89 also receives a reference earth from pin 32 and sends a signal to pin 37 of M70. SensorK89 is fitted with a fan motor controlled by the ignition so that the temperature reading is not affected by the motionless and thus warmer air inside the dashboard. The solar ray sensorK90 informs the control unit of the heat coming from rays: it receives a 5V supply from pin 38 control unit M70 and gives out two signals: to pin 39 for the right area and to pin 40 for the left area. The exhaust gas presence sensor (A.Q.S.)K64 supplies a recirculation control signal when the air pollution exceeds pre-set levels: it is supplied at pin 1 from the line controlled by the ignition (INT/A) protected by fuse F31 of underfacia control unit B2; pin 2 is earthed and pin 3 sends a signal to pin 27 ofM70.Demisting sensorK03 is supplied at pin 2 of ignition-operated line (INT) protected by fuse F49 of underfacia control unit B2; pin 1 is earthed and pin 3 sends a signal to pin 28 ofM70.The air conditioning system is equipped with one recirculation actuator (N82), two air blending actuators (N78 and N79) and two air distribution actuators (N81 and N83). Recirculation actuatorN82 is controlled by control unit M70, via pins 1, 2, 3 and 4.Mixing actuatorsN78 and N79 are controlled from control unit M70 via pins 5, 6, 7, 8 and 11, 12, 13 14 respectively. Distribution actuatorN80 is controlled from control unit M70 from pins 15, 16, 17 and 18. An electronic governerM72 controls fan N85 at different speeds via an earth command: this is ignition-operated (INT/A) from a line protected by fuse F31 of underfacia control unit B2. It receives a control signal from pin 33 of the control unit and returns a feedback signal to pin 9 of M70. FanN85 is supplied directly from a line protected by fuse F5 of engine bay control unit B1. Pin 36 ofM70 controls activation of the compressor.The outdoor temperature sensor is located on door mirrorP60: the sensor is connected to the control unit on door H44 and thence, via the CAN network, to M70. Pins 34 and 35 of control unit M70 connect to Body Computer M1 and node H44 via the CAN line: speedometer signal, windscreen washer on signal for recirculation activation, window and sunroof shut command, battery voltage signal, rear window on signal.