Hyundai Equus: A/C Pressure Transducer Repair procedures
1. |
Measure the pressure of high pressure line by measuring voltage output between terminal “1” and “2”. 
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2. |
Inspect the voltage value whether it is sufficient to be regular value or not. 
Voltage = 0.00878835 * Pressure + 0.37081095
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3. |
If the measured voltage value is not wihtin specification, replace the A/C pressure transducer. |
1. |
Disconnect the negative (-) battery terminal. |
2. |
Recover the refrigerant with a recovery/charging station. |
3. |
Disconnect the A/C pressure transducer connector (A). 
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4. |
Remove the A/C pressure transducer (A).
Tightening torque :
10 ~ 12 N.m (1.02 ~ 1.22 kgf.m, 7.4 ~ 8.8 lb-ft)
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Be careful not to bend the liquid & suction pipe.
Support the hex portion of the pipe with a wrench while removing or installing the A/C pressure transducer. |
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5. |
Install in the reverse order of removal.
When installing, replace it with a new O-ring (A). |

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Description
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 coolin ...
Description
The evaporator temperature sensor will detect the evaporator
core temperature and interrupt compressor relay power in order to
prevent evaporator from freezing by excessive cooling. ...