A/c Compressor Controls (Full Auto): Overview Kia Optima II

Scheme 3

Scheme 4

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

DESCRIPTION

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 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.

Scheme 5

1. Ignition "ON".
2. Using the scan tool.
3. Emit intensive light toward photo sensor using a lamp, and check the output voltage change.
4. The voltage will rise with higher intensive light and reduce with lower intensive light.

Scheme 6

1. Disconnect the negative (-) battery terminal.
2. Using a suitable tool that will not damage the sensor, crash pad, or windshield remove the photo sensor (B) from the center of defrost nozzle (A).
3. Install in the reverse order of removal.

Scheme 7

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 8

1. Ignition "ON".
2. Using the multi-tester, Measure resistance between terminal "1" and "2" of water temperature sensor. SPECIFICATION TEMPERATURE RESISTANCE SPECIFICATION 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.

Scheme 9

1. Disconnect the negative (-) battery terminal.
2. Remove the grove box. (Refer to «CRASH PAD»(ref-266048-S40843902972007092700000) )
3. Pull the water temperature sensor(B) out at the heater unit with the clamp (A).
4. Installation is the reverse order of removal. NOTE: Do not damage the sensor wiring during installation.

Scheme 10

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 11

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 TEMPERATURE RESISTANCE SPECIFICATION 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 12

1. Disconnect the negative (-) battery terminal.
2. Remove the front bumper. (Refer to «FRONT BUMPER»(ref-266056-S09773572352007092700000) )
3. Remove the ambient temperature sensor (A).
4. Installation is the reverse order of removal.

Scheme 13

Scheme 14

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.