Heating, Ventilation & Air Conditioning: Overview Hyundai Sonata V рестайлинг

OIL RETURN OPERATION

There is close affinity between the oil and the refrigerant. During normal operation, part of the oil recirculates with the refrigerant in the system. When checking the amount of oil in the system, or replacing any component of the system, the compressor must be run in advance for oil return operation. The procedure is as follows

1. Open all the doors and the engine hood.
2. Start the engine and air conditioning switch to "ON" and set the blower motor control knob at its highest position.
3. Run the compressor for more than 20 minutes between 800 and 1,000 RPM in order to operate the system.
4. Stop the engine.

DESCRIPTION

A/C pressure transducer convert the pressure value of high pressure line into voltage value after measure it. By converted voltage value, engine ECU controls cooling fan by operating it high speed or low speed. Engine ECU stop the operation of compressor when the temperature of refrigerant line is so high or so low irregularly to optimize air conditioning system.

Scheme 20

1. Measure the pressure of high pressure line by measuring voltage output between No.1 and No.2 terminals.
2. Inspection the voltage value whether it is sufficient to be regular value or not. Voltage = 0.00878835 * Pressure (psig) + 0.5
3. If the measured voltage value is not specification, replace the A/C pressure transducer.

Scheme 21

1. Disconnect negative (-) battery terminal.
2. Disconnect A/C pressure transducer connector (A) (3P) from wiring harness.
3. Remove the A/C pressure transducer. CAUTION: Take care that liquid suction pipe is not bent.
4. Installation is the reverse order of removal. TORQUE : 10~12 N.m (1.02~1.22 kgf.m, 7.4~8.8 lb-ft)

Scheme 22

The evaporator temperature sensor will detect the evaporator core temperature and interrupt compressor relay power in order to prevent evaporator freezing by excessive cooling.

It is a negative type thermistor whose resistance is inversely proportional to temperature.

Scheme 23

1. Ignition "ON".
2. Turn on the A/C switch.
3. Disconnect evaporator temperature sensor.
4. Using the multi-tester, Measure resistance between terminal "1" and "2" of evaporator temperature sensor. SPECIFICATION EVAPORATOR CORE TEMPERATURE SPECIFICATION Evaporator core temperature [°C(°F)] Resistance [Kohms] -10 (14) 18.31 0 (32) 11.60 10 (50) 7.55 15 (59) 5.04 30 (86) 3.44 40 (104) 2.40
5. If the measured resistance is not specification, substitute with a known-good evaporator temperature sensor and check for proper operation.
6. If the problem is corrected, replace the evaporator temperature sensor.

Scheme 24

Scheme 25

1. Pull out the passenger's crash pad center low cover (A).
2. Disconnect the connector pin (B).
3. Remove the evaporator temperature sensor (C) by pulling it after rotating 90° in a counterclockwise direction.
4. Installation is the reverse order of removal.

Scheme 26

Scheme 27

1. In-car air temperature sensor is located at the lower crash pad.
2. The sensor contains a thermistor which measures the temperature of the inside. The signal, decided by the resistance value which changes in accordance with perceived inside temperature, is delivered to heater control unit and according to this signal the control unit regulates incar temperature to intended value.

Scheme 28

1. Ignition "OFF".
2. Disconnect in-car sensor.
3. Using the multi-tester, Measure resistance between terminal "2" and "4" of in-car sensor. SPECIFICATION TEMPERATURE SPECIFICATION Temperature [°C(°F)] Resistance between terminals 2 and 4 (Kohms) -15 (5) 216.1 ± 3.2% 0 (32) 97.71 ± 2.4% 15 (59) 47.13 ± 1.7% 25 (77) 30.00 ± 1.2% 35 (95) 19.59 ± 1.6% 50 (122) 10.81 ± 2.2%

Scheme 29

1. Disconnect the negative (-) battery terminal.
2. Remove the lower crash panel (A). (Refer to «CRASH PAD»(ref-286589-S22159734202008060300000) ).
3. Disconnect the connector of in-car sensor.
4. Loosen the mounting screws (B) and then remove the in-car sensor (C).
5. Installation is the reverse order of removal.

Scheme 30

1. The photo sensor is located at the right part of defrost nozzle.
2. The photo sensor contains a photovoltaic (sensitive to sunlight) diode. The solar radiation received by its light receiving portion, generates an electromotive force in proportion to the amount of radiation received which is transferred to the automatic temperature control module so that the solar radiation compensation will be performed.

Scheme 31

1. Ignition "ON".
2. Using the scan tool.
3. Emit intensive light toward photo sensor using sunshine, and check the output absolute voltage change.
4. The absolute voltage will rise with higher intensive light and reduce with lower intensive light. NOTE: When checking photo sensor, select a place where is exposed to sunshine directly.

Scheme 32

1. Disconnect the negative (-) battery terminal.
2. Using the (-) driver, Remove the photo sensor (B) from the right part of defrost nozzle (A).
3. Disconnect the connector.
4. Installation is the reverse order of removal.

Scheme 33

Scheme 34

1. Water temperature sensor (A) is located at the heater unit.
2. It detects coolant temperature. Its signal is used for cold engine lockout control. When the driver operates the heater before the engine is warmed up, the signal from sensor causes the heater control unit to reduce blower motor speed until coolant temperature reaches the threshold value.

Scheme 35

1. Ignition "OFF".
2. Disconnect water temperature sensor connector.
3. Using the multi-tester, Measure resistance between terminal "1" and "2" of water temperature sensor. SPECIFICATION COOLANT TEMPERATURE SPECIFICATION Coolant temperature [°C(°F)1 Resistance between terminals 1 and 2 (Kohms) -10 (14) 55.27 0 (32) 32.61 20 (68) 12.48 40 (104) 5.33 60 (140) 2.50 80 (176) 1.27
4. If the measured resistance is not specification, substitute with a known-good water temperature sensor and check for proper operation.
5. If the problem is corrected, replace the water temperature sensor.

Scheme 36

1. Disconnect the negative (-) battery terminal.
2. Pull out the passenger's crash pad center low cover (A).
3. Remove the under cover after loosening 2 screws.
4. Disconnect the connector (A) of water temperature sensor.
5. Pull the water temperature sensor (B) out at the heater unit with the stopper (C).
6. Install in the reverse order of removal. NOTE: Take care that wire of water temperature sensor is not to be damaged.

Scheme 37

Scheme 38

1. The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperatures.
2. The sensor output will be used for discharge temperature control, temperature regulation door control, blower motor level control, mix mode control and in-car humidity control. NOTE: If the ambient temperature is below 2.0°C (35.6°F), the A/C compressor will be stopped. The compressor will be operated by manual operating.

Scheme 39

1. A.Q.S is located at center support in front of the engine radiator, and detects hazardous elements in ambient air providing output signal to control.
2. It will detect sulfurous acid gas, carbon dioxide, carbon monoxide, hydrocarbon and allergen.

1. Humidity sensor is located at the lower crash pad and detects in-car humidity for in-car humidity control.
2. If ambient air temperature or in-car humidity is outside certain range, it will turn on A/C to control in-car humidity preventing in car fogging. Air conditioner operation depends on ambient temperature and humidity.

1. Heater unit includes mode control actuator and temperature control actuator.
2. Temperature control actuator is located at the heater unit. Signal from control unit adjusts position of temperature door by operating temperature switch and then temperature will be regulated by the hot/cold air ratio determined by position of temperature door.

Scheme 40

1. Ignition "OFF".
2. Disconnect the connector of temperature control actuator.
3. Verify that the temperature control actuator operates to the hot position when connecting 12V to the terminal 3 and grounding terminal 4.
4. Verify that the temperature control actuator operates to the cool position when the connections are reversed.
5. Check the voltage between terminals 5 and 6. SPECIFICATION REFERENCE CHART Door position Voltage (5-6) Error detecting Max. cooling 0.3 ± 0.15V Low voltage: 0.1V or less Max. heating 4.7 + 0.15V High voltage: 4.9V or more It will feedback current position of actuator to controls.
6. If the measured voltage is not within specification, substitute with a known-good temperature control actuator and check for proper operation.
7. If the problem is corrected, replace the temperature control actuator.

Scheme 41

1. Disconnect the negative (-) battery terminal.
2. Pull out the passenger's crash pad center lower cover (A).
3. Disconnect the connector of temperature control actuator after removing the air duct.
4. Loosen the mounting screw and then remove the temperature control actuator (B).
5. Install in the reverse order of removal.

Scheme 42

The mode control actuator is located at the heater unit.

It adjusts position of mode door by operating mode control actuator based on signal of A/C control unit. Pressing mode select switch makes the mode control actuator shift in order of vent --> BI/LEVEL --> floor --> mix.

Scheme 43

1. Ignition "OFF".
2. Disconnect the connector of mode control actuator.
3. Verify that the mode control actuator operates to the defrost position when connecting 12V to the terminal 3 and grounding terminal 4.
4. Verify that the mode control actuator operates to the vent position when connecting in the reverse.
5. Check the voltage between terminals 5 and 6. REFERENCE CHART Door position Voltage (5-6) Error detecting Vent 0.3 ± 0.15V Low voltage: 0.1V or less Defrost 4.7 ± 0.15V High voltage: 4.9V or more It will feedback current position of actuator to controls.
6. If the measured voltage is not specification, substitute with a known-good mode control actuator and check for proper operation.
7. If the problem is corrected, replace the mode control actuator.

Scheme 44

Scheme 45

1. Disconnect the negative (-) battery terminal.
2. Pull out the driver's crush pad center lower cover (A).
3. Disconnect the connector of mode control actuator after removing the air duct.
4. Loosen the mounting screws and then remove the mode control actuator (B).
5. Install in the reverse order of removal.

Scheme 46

Scheme 47

This has particle filter which eliminates foreign materials and odor. The particle filter includes odor filter as well as conventional dust filter to ensure a comfortable interior environment.

Scheme 48

Scheme 49

Scheme 50

1. Remove the damper (A) from the glove box after removing side cover.
2. Open the glove box (A). Lower the glove box down completely by removing the glove box stopper (B) to the glove box.
3. Remove the filter cover (A) with pushing the knob.
4. Replace the air filter (B), install it after making sure of the direction of air filter. NOTE: In case of driving in an air-polluted area or rugged terrain, check and replace the air filter as frequently as possible. Replacement period: 15,000 km (9320 mile)

Scheme 51

1. The intake actuator is located at the blower unit.
2. It regulates the intake door by signal from control unit.
3. Pressing the intake selection switch will shift between recirculation and fresh air modes.

Scheme 52

1. Ignition "OFF".
2. Disconnect the connector of intake actuator.
3. Verify that the intake actuator operates to the recirculation position when connecting 12V to the terminal 3 and grounding terminal 4.
4. Verify that the intake actuator operates to the fresh position when the connections are reversed. VOLTAGE SPECIFICATION Door position Voltage (5-6) Error detecting Recirculation 0.3 ± 0.15V Low voltage: 0.1V or less Fresh 4.7 ± 0.15V High voltage: 4.9V or more
5. If the intake actuator does not operate properly, substitute with a known-good intake actuator and check for proper operation.
6. If the problem is corrected, replace the intake actuator.

Scheme 53

1. Disconnect the negative (-) battery terminal.
2. Remove the glove box (Refer to the «INTERIOR»(ref-286589-S35354041722008060300000) ).
3. Disconnect the intake actuator connector.
4. Loosen the mounting screw and then remove the intake actuator (B) from the blower unit (A).
5. Install in the reverse order of removal.

Scheme 54

CONNECTOR PIN FUNCTION

CONNECTOR PIN REFERENCE

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

1. Disconnect the negative (-) battery terminal.
2. Remove the center facia panel (A) after pulling it by using a regular screwdriver (-).
3. Disconnect the connectors (B) from the center facia.
4. Remove the heater & A/C controller (C).
5. Install in the reverse order of removal.

Scheme 60

CONNECTOR PIN FUNCTION

CONNECTOR PIN REFERENCE

Scheme 61

Scheme 62

Scheme 63

GENERAL DESCRIPTION

Humidity sensor located at crash pad, detects in-car humidity for in-car humidity control. If ambient air temperature or in-car humidity is outside certain range, it will turn on A/C to control in-car humidity for preventing in-car fogging. Air conditioner operation depends on ambient temperature and humidity.

DTC DESCRIPTION

The Heater & A/C controller sets DTC B1200 if there is an open circuit in humidity sensor signal harness or the measured frequency value of sensor is more than threshold value (about 7,100Hz)

Refer to DTC B1200 .

The Heater & A/C controller sets DTC B1201 if there is a short circuit in humidity sensor signal harness or the measured frequency value of sensor is less than threshold value (about 6,186Hz)

The Water Temp. Sensor located at heater unit, detects coolant temperature. Its signal is used for cold engine lockout control. When the driver operates the heater before the engine is warmed up, the signal from sensor causes the heater control unit to reduce blower motor speed until coolant temperature reaches the threshold value.

The Heater & A/C controller sets DTC B1202 if there is an open circuit in Water Temp. Sensor signal harness or the measured resistance value of the sensor is more than the threshold value (about 176.3kohms)

Refer to DTC B1202 .

The A/C controller sets DTC B1203 if there is a short circuit in Water Temp. Sensor signal harness or the measured resistance value of sensor is less than threshold value (about 1.2kohms)

Intake door located at heater unit controls the inlet of car. When driver operates the intake switch, Heater & A/C controller recirculationeives mode signal from intake switch and operates intake door actuator to turn intake door to intended position, (with fresh mode signal, intake door is closed and with fresh mode signal, intake door is opened).

The Heater & A/C controller sets DTC B1208 if there is an open circuit or poor connection in the Intake Potentiometer.

Refer to DTC B1208 .

The Heater & A/C controller sets DTC B1209 if there is a short to power in the Intake Potentiometer.

The Incar Temperature Sensor located at crush pad, control unit contains a thermistor which measures the temperature of the inside. The signal, decided by the resistance value which changes in accordance with perceived inside temperature, is delivered to heater control unit and according to this signal, the control unit regulates Incar Temperature to intended value.

The Heater & A/C controller sets DTC B1233 if there is a short circuit in Incar Temp. Sensor signal harness or the measured resistance value of sensor is less than threshold value (about 7.46kohms)

Refer to DTC B1233 .

The Heater & A/C controller sets DTC B1234 if there is an open circuit in Incar Temp. Sensor signal harness or the measured resistance value of sensor is more than threshold value (about 509.57kohms)

The Ambient Temperature Senor located at the center stay of the condenser, detects ambient air temperature. It is a negative type thermistor whose resistance is inversely proportional to temperature. Its output is used for discharge temperature sensor, sensor fail-safe, temperature regulation door lock, blower motor level control, mix mode control and in-car humidity control.

The Heater & A/C controller sets DTC B1237 if there is a short circuit in Ambient Temp. Sensor signal harness or the measured resistance value of sensor is less than threshold value (about 7.48kohms)

Refer to DTC B1237 .

The Heater & A/C controller sets DTC B1238 if there is an open circuit in Ambient Temp. Sensor signal harness or the measured resistance value of sensor is more than threshold value (about 527kohms)

The Evaporator Temperature Sensor located on heater unit, detects the core temperature and interrupts compressor relay power, in order to prevent evaporator freezing by excessive cooling. It is a negative type thermistor whose resistance is inversely proportional to temperature.

The Heater & A/C controller sets DTC B1241 if there is a short circuit in Evaporator Temp. Sensor signal harness or the measured resistance value of sensor is less than threshold value (about 0.9kohms)

Refer to DTC B1241 .

The Heater & A/C controller sets DTC B1242 if there is an open circuit in Evaporator Temp. Sensor signal harness or the measured resistance value of sensor is more than threshold value (about 13.6kohms)

Temperature Control Actuator located at heater unit, regulates the temperature by the procedure as follows. Signal from control unit adjusts position of temp, door by operating temp, motor and then temperature will be regulated by the hot/cold air ratio decided by position of temp. door.

The Heater & A/C controller sets DTC B1245 if there is an open circuit or poor connection in the Air Mix Potentiometer.

Refer to DTC B1245 .

The Heater & A/C controller sets DTC B1246 if there is a short to power in the Air Mix Potentiometer.

The Mode Control Actuator mounted on heater unit, adjusts position of mode door by operating Direction Motor based on signal of Heater & A/C controller. Pressing mode select switch makes the mode control actuator shift in order of vent--> B/L --> floor --> mix.

The Heater & A/C controller sets DTC B1249 if there is an open circuit or poor connection in the Direction Potentiometer.

Refer to DTC B1249 .

The Heater & A/C controller sets DTC B1250 if there is a short to power in the Direction Potentiometer.

AQS (Air Quality System) keeps air inside in the most suitable state for driver. In polluted area AQS detects hazardous gas and intercepts inflow automatically, Inversely, In fresh area it allows the inflow of air to prevent the shortage of air and the accumulation of carbon dioxide. AQS sensor is located at front side of condensor and once hazardous gas is detected, it delivers the voltage signal to A/C controller for closing intake door.

The A/C controller sets DTC B1257 if there is an open circuit in AQS sensor signal harness or the measured voltage value of sensor is more than threshold value.

Refer to DTC B1257 .

The A/C controller sets DTC B1258 if there is a short circuit in AQS sensor signal harness or the measured voltage value of the sensor is less than the threshold value.

Refer to DTC B1257 .

The A/C controller sets DTC B1259 if preheating time of AQS sensor is over 40sec or signal from AQS sensor is not within specifications.

Temperature Control Actuator located at heater unit, regulates the temperature by the procedure as follows. Signal from control unit adjusts position of temp, door by operating temp, motor and then temperature will be regulated by the hot/cold air ratio decided by position of temp. door.

The Heater & A/C controller sets DTC B2406 if the Air Mix Actuator doesn't move to intended position within 40sec (In this case, Heater & A/C controller try to move temp, door for 2sec. 3 times, every 20 sec. before setting DTC).

Refer to DTC B1208 .

The Heater & A/C controller sets DTC B2408 if the intake motor doesn't move to intended position within 40sec (The Heater & A/C controller attempts to move the intake door for a 2 second duration at a freshquency of 3 times every 20 seconds before storing a DTC.)

Refer to DTC B1249 .

The Heater & A/C controller sets DTC B2409 if the Direction Motor doesn't move to intended position within 40sec (In this case, Heater & A/C controller try to move mode door for 2sec. 3 times, every 20 sec. before setting DTC).