Heating, Ventilation and Air Conditioning: Overview Kia Sorento I рестайлинг

Scheme 18

1. R-134a liquid refrigerant is highly volatile. A drop on the skin of your hand could result in localized frostbite. When handling the refrigerant, be sure to wear gloves.
2. It is standard practice to wear goggles or glasses to protect your eyes, and gloves to protect your hands. If the refrigerant splashes into your eyes, wash them with clean water immediately.
3. The R-134a container is highly pressurized. Never leave it in a hot place, and check that the storage temperature is below 52°C (126°F)
4. An electronic leak detector should be used to check the system for refrigerant leakage. Bear in mind that the R-134a, upon coming into contact with flame, produces phosgene, a highly toxic gas.
5. Use only recommended the lubricant for R-134a systems. If lubricants other than the recommended one used, system failure may occur.
6. PAG lubricant absorbs moisture from the atmosphere at a rapid rate, therefore the following precautions must be observed: When removing refrigerant components from a vehicle, cap immediately the components to prevent from the entry of moisture. When installing refrigerant components to a vehicle, do not remove the cap until just before connecting the components. Complete the connection of all refrigerant tubes and hoses without delay to prevent the A/C system from taking on moisture. Use the recommended lubricant from a sealed container only.
7. If an accidental discharge in the system occurs, ventilate the work area before resuming service. (Scheme 18): Precaution When Handling Refrigerant

Scheme 19

1. Never open or loosen a connection before discharging the system.
2. Seal the open fittings of components with a cap or plug immediately to prevent intrusion of moisture or dust.
3. Do not remove the sealing caps from a replacement component until it is ready to be installed.
4. Before connecting an open fitting, always install a new sealing ring. Coat the fitting and seal with refrigerant oil before making the connection. (Scheme 19): Precaution When Replacing Parts On A/C System

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. (Scheme 20): Identifying Connector Terminals
2. Inspect the voltage value whether it is sufficient to be regular value or not. Voltage = Vdd*(0.025*P+0.1) [Kgf/cm 2 ] Voltage = Vdd*(0.254929*P+0.1) [Mpa] Voltage = Vdd*(0.001758*P+0.074162 [PSIA]
3. If the measured voltage value is not specification, replace the A/C pressure transducer.

Scheme 21

1. Disconnect the negative (-) battery terminal.
2. Recover the refrigerant with a recovery/charging station.
3. Remove the front bumper. Refer to «BODY (INTERIOR AND EXTERIOR)»(ref-278816) - front bumper.
4. Disconnect A/C pressure transducer connector (3P) (A). (Scheme 21): Identifying A/C Pressure Transducer Connector
5. Remove the A/C pressure transducer. CAUTION: Take care that liquid & suction pipe are not bent.
6. Installation is the reverse order of removal. TORQUE: 10-12 N.m (1.0-1.2 kgf.m, 7.4-8.8 lbf. ft)

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 22

1. Engine "ON", Aircon s/w "ON"
2. Using the multi-tester, Measure resistance between terminal "1" and "2" of evaporator temperature sensor. (Scheme 22): Measuring Resistance Between Evaporator Temperature Sensor Terminals [SPECIFICATION] EVAPORATOR CORE TEMPERATURE SPECIFICATIONS Evaporator core temperature [°C (°F)] Resistance [kohms] -10 (14) 18.01 -5 (23) 14.25 0 (32) 11.36 5 (41) 9.12 10 (50) 7.37 15 (59) 5.99 20 (68) 4.9 25 (77) 4.03 30 (86) 3.33 35 (95) 2.77 40 (104) 2.31
3. If the measured resistance is not specification, substitute with a known-good evaporator temperature sensor and check for proper operation.
4. If the problem is corrected, replace the evaporator temperature sensor.

Scheme 23

Scheme 24

1. Remove crash pad. Refer to «CRASH PAD»(ref-278816-S11302877372008020400000).
2. Remove the cowl cross bar. Refer to «CRASH PAD»(ref-278816-S11302877372008020400000).
3. Remove the blower unit.
4. Disconnect the evaporator connector (A). (Scheme 23): Identifying Evaporator Connector
5. Remove the blower unit case. Refer to «BLOWER UNIT»(ref-278806-S39495410612008020400000).
6. Remove the evaporator sensor (A). (Scheme 24): Identifying Evaporator Sensor
7. Installation is the reverse order of removal.

Scheme 25

1. In-car air temperature sensor is located at the center fascia lower panel.
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 in-car temperature to intended value. (Scheme 25): Identifying Center Fascia Lower Panel

Scheme 26

1. Ignition "ON"
2. Blow air with changing temperature to the in car sensor air inlet. Measure sensor resistance between 2 and 4 terminals. (Scheme 26): Identifying In-Car Air Temperature Sensor Terminals [SPECIFICATION] RESISTANCE SPECIFICATIONS Temperature [°C (°F)] Resistance between terminals 2 and 4 (kohms) -35 (-31) 687.46 -30 (-22) 509.57 -15 (5) 216.07 0 (32) 97.71 15 (59) 47.13 25 (77) 30 35 (95) 19.59 45 (113) 13.10 55 (131) 8.96 NOTE: In-car sensor is negative type thermistor that resistance will rise with lower temperature, and reduce with higher temperature.

Scheme 27

1. Disconnect the negative (-) battery terminal.
2. Remove the crash pad. Refer to «CRASH PAD»(ref-278816-S11302877372008020400000).
3. Disconnect the connector of in-car sensor. Loosen the mounting 2 screws and then remove the in-car sensor (A). (Scheme 27): Identifying In-Car Sensor
4. Installation is the reverse order of removal.

1. The photo sensor (A) is located at the center 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 28

1. Ignition "ON"
2. Emit intensive light toward photo sensor using a lamp, and check the output voltage change between terminal 2 and 1.
3. Check the output voltage change between terminal 3 and GND.
4. The voltage will rise with higher intensive light and reduce with lower intensive light. (Scheme 28): Checking Output Voltage Change Between Terminal 3 And GND

Scheme 29

1. Disconnect the negative (-) battery terminal.
2. With the (-) driver, remove the photo sensor (B) from the left of defrost nozzle (A). (Scheme 29): Identifying Photo Sensor And Defrost Nozzle
3. Install in the reverse order of removal.

1. Water temperature sensor 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 30

1. Ignition "ON"
2. Using the multi-tester, measure resistance between terminal "1" and "2" of water temperature sensor. (Scheme 30): Measuring Resistance Between Water Temperature Sensor Terminals [SPECIFICATION] COOLANT TEMPERATURE SPECIFICATIONS Coolant temperature [°C (F°)] Resistance (kohms) -30 (-22) 176.3 -20 (-4) 96.44 -10 (14) 54.99 0 (32) 32.51 10 (50) 19.85 20 (68) 12.48 30 (86) 8.061 40 (104) 5.334
3. If the measured resistance is not specification, substitute with a known-good water temperature sensor and check for proper operation.
4. If the problem is corrected, replace the water temperature sensor. NOTE: Negative type thermistor that resistance will rise with lower temperature, and reduce with higher temperature.

Scheme 31

1. Disconnect the negative (-) battery terminal.
2. Remove the glove box. Refer to «CRASH PAD»(ref-278816-S11302877372008020400000).
3. Disconnect the connector (A) of water temperature sensor (B) and then remove the water temperature sensor by pulling out. (Scheme 31): Identifying Water Temperature Sensor Connector
4. Installation is the reverse order of removal. NOTE: Take care that wire of water temperature sensor is not to be damaged

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 32

1. Ignition "OFF"
2. Disconnect ambient temperature sensor.
3. Check the resistance of ambient temperature sensor between terminals 1 and 2 whether it is changed by changing of the ambient temperature. [SPECIFICATION] AMBIENT TEMPERATURE SPECIFICATIONS Ambient temperature [°C (°F)] Resistance between terminals 1 and 2 (kohms) -30 (-22) 508.04 -20 (-4) 271.45 -10 (14) 158.32 0 (32) 95.096 10 (50) 58.764 20 (68) 37.30 30 (86) 24.274 40 (104) 16.165 50 (122) 10.995 60 (140) 7.625 (Scheme 32): Checking Resistance Of Ambient Temperature Sensor
4. If the measured resistance is not specification, substitute with a known-good ambient temperature sensor and check for proper operation.
5. If the problem is corrected, replace the ambient temperature sensor.

Scheme 33

1. Disconnect the negative (-) battery terminal.
2. Remove the front bumper. Refer to «BODY (INTERIOR AND EXTERIOR)»(ref-278816) - Front bumper.
3. Remove the ambient temperature sensor (A). (Scheme 33): Identifying Ambient Temperature Sensor
4. Installation is the reverse order of removal.

1. Humidity sensor is located at the lower crash pad and detected 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. see scheme 25: Identifying Humidity Sensor

Scheme 34

1. Ignition "ON"
2. Using the scan tool.
3. Check the frequency of humidity sensor between terminals 2 and 3. (Scheme 34): Identifying Humidity Sensor Connector Terminals FREQUENCY SPECIFICATIONS Humidity (%) Frequency between terminals 2 and 3 (Hz) 30 6976 ± 5% 50 6728 ± 5% 60 6600 ± 5% 70 6468 ± 5% 80 6330 ± 5% 90 6186 ± 10%
4. If the measured resistance is not specification, substitute with a known-good humidity sensor and check for proper operation.
5. If the problem is corrected, replace the Humidity sensor.

1. Heater unit includes mode control actuator and temperature control actuator.
2. Temperature control actuator is located at the heater unit. It regulates the temperature by the procedure as follows. 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 decided by position of temperature door.

Scheme 35

Scheme 36

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. Verify that the temperature control actuator operates to the cool position when connecting in the reverse. [DRIVER] (Scheme 35): Inspecting Temperature Control Actuator For Driver [PASSENGER] (Scheme 36): Inspecting Temperature Control Actuator For Passenger
4. Check the voltage between terminals 5 and 6. [SPECIFICATION] VOLTAGE SPECIFICATIONS 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.
5. If the measured voltage is not specification, substitute with a known-good temperature control actuator and check for proper operation.
6. If the problem is corrected, replace the temperature control actuator.

Scheme 37

Scheme 38

1. Disconnect the negative (-) battery terminal.
2. Remove the driver's crash pad lower panel. Refer to «BODY (INTERIOR AND EXTERIOR)»(ref-278816).
3. Disconnect the temperature control actuator connector (A) after removing the air duct.
4. Loosen the mounting screw and then remove the temperature control actuator (B). [DRIVER] (Scheme 37): Identifying Temperature Control Actuator For Driver [PASSENGER] (Scheme 38): Identifying Temperature Control Actuator For Passenger
5. Installation is the reverse order of removal.

Identifying Mode Control Actuator. Scheme 39

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 --> B/L --> floor --> mix.

Scheme 40

1. Ignition "OFF"
2. Disconnect the connector of mode control actuator.
3. Verify that the mode control actuator operates to the defrost mode when connecting 12V to the terminal 3 and grounding terminal 4.
4. Verify that the mode control actuator operates to the vent mode when connecting in the reverse. (Scheme 40): Inspecting Mode Control Actuator
5. Check the voltage between terminals 5 and 6. VOLTAGE SPECIFICATIONS 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.

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

Scheme 41

Scheme 42

Scheme 43

1. Open the glove box (B). Lower the glove box down completely by removing the glove box stopper (A) to the glove box. (Scheme 42): Identifying Glove Box Stopper
2. Remove the glove box (A) from the lift (B). (Scheme 43): Identifying Glove Box
3. Remove the filter cover (A) with pushing the knob. see scheme 53: Identifying Filter Cover With Pushing Knob
4. Replace the air filter (B), install it after making sure of the direction of air filter. (Scheme 45): Identifying 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)

Identifying Intake Actuator. Scheme 44

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 45

1. Ignition "OFF"
2. Disconnect the intake actuator connector.
3. Verify that the 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 connecting in the reverse. see scheme 56: Inspecting Intake Actuator
5. If the intake actuator is not operated well, substitute with a known-good intake actuator and check for proper operation.
6. If the problem is corrected, replace the intake actuator.

1. Disconnect the negative (-) battery terminal.
2. Remove the crash pad. Refer to «CRASH PAD»(ref-278816-S11302877372008020400000).
3. Disconnect the intake actuator connector.
4. Loosen the mounting screw and then remove the intake actuator (A) from the blower unit. (Scheme 47): Identifying Intake Actuator
5. Installation is the reverse order of removal.

Identifying Control Panel. Scheme 46

[CONNECTOR PIN FUNCTION]

CONTROL PANEL SPECIFICATIONS

Scheme 47

Scheme 48

1. Disconnect the negative (-) battery terminal.
2. Remove the side garnish (A). (Scheme 48): Identifying Side Garnish
3. After loosening the heater control mounting screw, remove the heater control unit (A). see scheme 60: Identifying Heater Control Unit
4. After disconnect the connector (A), remove the heater control unit (B). (Scheme 50): Identifying Heater Control Unit
5. Installation is the reverse order of removal.

Identifying Blower And A/C Controls (Automatic). Scheme 49

[CONNECTOR PIN FUNCTION]

CONTROL PANEL SPECIFICATIONS

Scheme 50

1. Self-diagnosis process The F.A.T.C. module self test feature will detect electrical malfunction and provide error codes for system components with suspected failures. see scheme 63: Diagnosis Flow Chart NOTE: DTC data can be retrieved from the control panel directly or from the DLC using the Hi-Scan Pro.
2. How to read self-diagnostic code After the display panel flickers three times every 0.5 second, the corresponding fault code flickers on the setup temperature display panel every 0.5 second and will show two figures. Codes are displayed in numerical format FAULT CODE DTC DATA Fault code Fail description Control unit 0 Normal 11 IN-CAR TEMPERATURE SENSOR OPEN (High) 12 IN-CAR TEMPERATURE SENSOR SHORT (Low) 13 AMBIENT TEMPERATURE SENSOR OPEN (High) 14 AMBIENT TEMPERATURE SENSOR SHORT (Low) 15 WATER TEMPERATURE SENSOR OPEN (High) 16 WATER TEMPERATURE SENSOR SHORT (Low) 17 EVAPORATOR TEMPERATURE SENSOR OPEN (High) 18 EVAPORATOR TEMPERATURE SENSOR SHORT (Low) 19 TEMP POTENTIOMETER OPEN or SHORT (Drive) 20 TEMP POTENTIOMETER FAULT (Drive) 21 MODE POTENTIOMETER OPEN or SHORT 22 MODE POTENTIOMETER FAULT 23 HUMIDITY SENSOR OPEN (Open) 24 HUMIDITY SENSOR SHORT (Short) 25 INTAKE POTENTIOMETER OPEN or SHORT 26 INTAKE POTENTIOMETER FAULT 32 TEMP POTENTIOMETER OPEN or SHORT (Passenger) 33 TEMP POTENTIOMETER FAULT (Passenger)
3. Fault code display. see scheme 64: Identifying Fault Code Display
4. If fault codes are displayed during the check, Inspect malfunction causes by referring to fault codes.
5. Fail safe In-car temperature sensor: Control with the value of 25°C (77°F) Ambient temperature sensor: Control with the value of 20°C (67°F) Evaporator temperature sensor: Control with the value of -2°C (28.4°F) Humidity sensor: Doesn't control. Photo sensor: None correction Temperature control actuator (Air mix potentiometer); If temperature set 17-24.5°C, fix at maximum cooling position. If temperature set 25-32°C, fix at maximum heating position. Mode control actuator (Direction potentiometer): Fix vent position, while selecting vent mode. Fix defrost position, while selecting all except vent mode.

GENERAL DESCRIPTION

Humidity sensor located at crush 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 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 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)

A 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 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)

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 A/C controller sets DTC B1204 if there is an open circuit or poor connection in the air mix potentiometer.

Refer to DTC B1204 .

The A/C controller sets DTC B1205 if there is a short to power in the air mix potentiometer.

Intake door located at heater unit controls the inlet of car. When driver operates the intake switch, A/C controller recirculation receives 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 A/C controller sets DTC B1208 if there is an open circuit or poor connection in the intake potentiometer.

Refer to DTC B1208 .

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

The in-car 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 in-car temperature to intended value.

The A/C controller sets DTC B1233 if there is a short circuit in in-car temp, sensor signal harness or the measured resistance value of sensor is less than threshold value (about 7.46kohms ).

Refer to DTC B1233 .

The A/C controller sets DTC B1234 if there is an open circuit in in-car 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 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 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 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 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 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 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 A/C control unit. Pressing mode select switch makes the mode control actuator shift in order of vent --> B/L --> floor --> mix.

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

Refer to DTC B1249 .

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

Refer to DTC B1245 .

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

Refer to DTC B1208 .

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

Refer to DTC B1249 .

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

Refer to DTC B1204 .

The A/C controller sets DTC B2415 if the air mix actuator doesn't move to intended position within 40sec (in this case, A/C controller try to move temp, door for 2 sec. 3 times, every 20 sec. before setting DTC).