OIL RETURN OPERATION
There is close affinity between the oil and the refrigerant. During normal operation, part of the oil recirculates with the refrigerant in the system.
When checking the amount of oil in the system, or replacing any component of the system, the compressor must be run in advance for oil return operation. The procedure is as follows
- Open all the doors and the engine hood.
- Start the engine and air conditioning switch to "ON" and set the blower motor control knob at its highest position.
- Run the compressor for more than 20 minutes between 800 and 1,000 RPM in order to operate the system.
- Stop the engine.
DESCRIPTION
A/C pressure transducer convert the pressure value of high pressure line into voltage value after measure it. By converting voltage value, engine ECU controls cooling fan by operating it high speed or low speed. Engine ECU stop the operation of compressor when the temperature of refrigerant line is so high or so low irregularly to optimize air conditioning system.
Scheme 1
- Measure the pressure of high pressure line by measuring voltage output between No. 1 and No. 2 terminals.
- Inspect the voltage value whether it is sufficient to be regular value or not. Voltage = 0.125 * Pressure + 0.5 [kgf/cm 2 ] Voltage = 0.00878835 * Pressure + 0.37081095 [PSIA]
- If the measured voltage value is not specification, replace the A/C pressure transducer.
Scheme 2
- Disconnect the negative (-) battery terminal.
- Recover the refrigerant with a recovery/charging station.
- Disconnect A/C pressure transducer connector (A) and then remove the A/C pressure transducer (B). WARNING: Take care that liquid and suction pipe are not bent.
- Installation is the reverse order of removal. TORQUE: 10~12 N.m (1.0~1.2 kgf.m, 7.4~8.8 lbf.ft)