Air Conditioning System: Overview Kia Optima II 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 ECM controls cooling fan by operating it high speed or low speed. Engine ECM stop the operation of compressor when the temperature of refrigerant line is so high or so low irregularly to optimize air conditioning system.

Scheme 1

1. Measure the pressure of high pressure line by measuring voltage output between NO. 1 and NO. 2 terminals.
2. Inspect 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 within specification, replace the A/C pressure transducer.

Scheme 2

1. Disconnect the negative (-) battery terminal.
2. Recover the refrigerant with a recovery/charging station.
3. Disconnect A/C pressure transducer connector (3P) (A). CAUTION: Take care that liquid & suction pipe are not bent.
4. Installation is the reverse order of removal.

TORQUE : 10~12N.m (1.0~1.2kgf.m, 7.4~8.8lb.ft)

Scheme 3

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.

1. In-car air temperature sensor is located at the center facia panel.
2. It senses the inside temperature, changes the resistance value, and enters the corresponding voltage into the automatic temperature control module.

Scheme 4

1. The photo sensor (A) is located at the center of defrost nozzle.
2. The photo sensor contains a photo voltaic (sensitive to sunlight) diode. The solar radiation received by its light receiving portion, generates an voltage signal 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.

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 5

1. Ignition "ON".
2. Using the multi-tester, Measure resistance between terminal "1" and "2" of water temperature sensor. Specification SPECIFICATION CHART Coolant temperature [°C(°F)] Resistance (kohms) Voltage (V) -10(14) 55.85 ± 3% 4.24 ± 3% 0(32) 32.91 ± 3% 3.83 ± 3% 10(50) 19.99 ± 3% 3.33 ± 3% 20(68) 12.51 ± 3% 2.78 ± 3% 30(86) 8.047 ± 3% 2.23 ± 3% 40(104) 5.311 ± 3% 1.73 ± 3% 50(122) 3.588 ± 3% 1.32 ± 3% 60(140) 2.476 ± 3% 0.99 ± 3% 70(158) 1.742 ± 3% 0.74 ± 3% 80(176) 1.246 ± 3% 0.55 ± 3%
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.

1. The ambient temperature sensor is located at the front side 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 is 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 6

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 SPECIFICATION CHART Ambient temperature [°C(°F)] Resistance between terminals 1 and 2 (kohms) -10 (14) 158.2 ± 3% 0 (32) 95.10 ± 3% 10 (50) 58.76 ± 3% 20 (68) 37.30 ± 3%
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 7

1. Disconnect the negative (-) battery terminal.
2. Remove the front bumper. (Refer to «FRONT BUMPER»(ref-357475-S10114743322010032300000) )
3. Remove the ambient temperature sensor (A).
4. Installation is the reverse order of removal.

Scheme 8

1. Humidity sensor is located at the lower crush 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.

Scheme 9