Automatic A/c-Heater Systems: Diagnosis Kia Sorento I

TROUBLESHOOTING

Before replacing or repairing air conditioning components, first determine if the malfunction is due to the refrigerant charge, air flow or compressor. The following diagnostic charts have been developed as a quick reference for determining the cause of the malfunction. If these charts do not satisfactorily describe the problem, refer to the appropriate section for a more detailed explanation. After correcting the malfunction, check the complete system to ensure that performance is satisfactory.

REFRIGERANT LEAK TEST

Use only service equipment that is U.L. listed and is certified to meet the requirements of SAE J2210 to remove HFC-134a (R-134a) from the air conditioning system.

If accidental system discharge occurs, ventilate work area before resuming service.

R-134a service equipment or vehicle air conditioning systems should not be pressure tested or leak tested with compressed air.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. Connect a R-134a refrigerant Recovery/Recycling/Charging System to the high-pressure service port and the low-pressure service port as shown in the previous illustration, following the equipment manufacturer's instructions.
2. Open the high-pressure valve to charge the system to the specified capacity, then close the supply valve, and remove the charging system couplers. Refrigerant capacity : 600 +/- 25 g (21.16 +/- 0.88 oz.)
3. Check the system for leaks using a R-134a refrigerant leak detector with an accuracy of 14 g (0.5 oz.) per year or better.
4. If you find leaks that require the system to be opened (to repair or replace hoses, fittings, etc.) recover the system according to the «REFRIGERANT RECOVERY»(ref-168977-S06703693662004122000000) procedure.
5. After checking and repairing leaks, the system must be evacuated.

Scheme 26

Scheme 27

1. Install the manifold gauge set.
2. Run the engine at 2,000 RPM and set the controls for maximum cooling and high blower speed.
3. Keep all windows and doors open.
4. Place a dry-bulb thermometer in the cool air outlet.
5. Place a wet-dry thermometer close to the inlet of the cooling unit.
6. Check that the reading on the high pressure gauge is 1,373-1,575 kPa (14-16 kg/cm 2 , 199-228 psi). If the reading is too high, pour water on the condenser. If the reading to too low, cover the front of the condenser.
7. Check that the reading on the dry-bulb thermometer at the air inlet at 25-35°C (77-95°F).
8. Calculate the relative humidity from the psychrometric graph by comparing the wet-and dry-bulb reading at the air inlet.
9. Measure the dry-bulb temperature at the cool air outlet, and calculate the difference between the inlet dry-bulb and outlet dry-bulb temperatures.
10. Check that the intersection of the relative humidity and temperature difference shown in following illustration, falls within specifications. If the intersection is within specifications, cooling performance is satisfactory.

Scheme 28

INSPECTION

In-car air temperature sensor is located at crash pad. It is installed with humidity sensor.

Scheme 29

It will detect interior temperature, which will be used for discharge temperature control, sensor fail-safe, temperature door control, blower motor level control and A/C auto control.

Scheme 30

1. Apply 12V to mode actuator terminal 2 and ground terminal 1.
2. Verify that the mode actuator operates as shown in illustration below when grounding terminals 7, 6, 5, 4 and 3 in sequence. VENT --> BI/LEVEL --> HEAT --> D/F DEF

Scheme 31

HOW TO READ SELF-DIAGNOSTIC CODE

1. After the display panel flickers three times every 0.5 second, the corresponding error code flickers on the setup temperature display panel every 0.5 second and will show two figures.
2. If error code is more than two, each code flickers 2 times in sequence.

Scheme 32

Scheme 33

1. See following illustration if DTC code is one.
2. See following illustration if DTC code is more than one.

Scheme 34

1. Set the temperature door at the center position and turn off the A/C system during the DTC check.
2. If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the DTC chart shown below.

Scheme 35

Scheme 36