KIA Niro: A/C Pressure Transducer

A/C Pressure Transducer Components and components location

1. A/C Pressure Transducer

Description

A/C pressure transducer measures the pressure in high pressure line and converts it into voltage. Based on the converted voltage, engine ECU controls cooling fan by operating it at high or low speed. Engine ECU stops the operation of compressor when the temperature of refrigerant line is too high or low irregularly to optimize air conditioning system.

A/C Pressure Transducer Repair procedures

Inspection

1. Measure the pressure of high pressure line by measuring voltage output between terminals "1" and "2".

2. Check if the voltage is within specification.

Voltage = 0.00878835 * Pressure + 0.37081095

3. If the measured voltage is not wihtin specification, replace the A/C pressure transducer.

Replacement

1. Disconnect the negative (-) battery terminal.
2. Recover the refrigerant with a recovery/charging station.

Warning

If PAG oil mixes into the POE oil of the system, dielectric breakdown may occur due to decreased volumetric resistivity and the A/C compressor may not work.

3. Disconnect the A/C pressure transducer connector (A).
4. Remove the A/C pressure transducer (B).

Warning

Be careful not to bend the liquid & suction pipe.

5. Install in the reverse order of removal.

Warning

When installing, replace it with a new O-ring (A).

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