Kia Carens: Air conditioning System / A/C Pressure Transducer Description and operation
The A/C Pressure Transducer (APT) converts the pressure value of high pressure
line into voltage value after measuring it. By converted voltage value, engine
ECU controls the cooling fan by operating it high speed or low speed. Engine
ECU stops the operation of the compressor when the temperature of refrigerant
line is very high or very low irregularly to optimize air conditioning system.

Replacement
1.
Remove the condenser.
2.
Remove the cap (B) on the bottom of the condenser with a L wrench (A).
...
Inspection
1.
Measure the pressure of high pressure line by measuring voltage output
between terminal “1” and “2”.
2.
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Other information:
With the immobilizer system, whenever you insert your ignition key into the ignition
switch and turn it to ON, it checks and determines and verifies if the ignition
key is valid or not.
If the key is valid, the engine will start.
If the key is invalid, the engine will not start.
To deactivate the ...
Components
1. Reservoir cap
2. Reservoir
3. Grommet
4. Master cylinder
...