Daewoo Mega 500-V - Page 240

S0605050K
Page 15
Air Conditioner
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3
High Pressure: Approximately 20 - 25 kg/cm
2
(284 - 356 psi)
Low Pressure: Approximately 2.5 - 3.5 kg/cm
2
(36 - 50 psi)
Possible Cause: Air in system.
1. Recover any remaining refrigerant.
2. Vacuum out system.
3. Recharge system.
NOTE: If the system has been exposed to the air for a long period of time, replace the receiver
dryer.
4
High Pressure: Over 6 kg/cm
2
(85 psi)
Low Pressure: Approximately 760 mmHg (Negative Pressure)
Possible Cause: Refrigerant does not circulate
Step Inspection Item Remedy
1
1. Connect manifold gauge and start engine.
2. Turn on air conditioner.
3. Set blower switch to HIGH position.
4. Turn air conditioner OFF and wait 10
minutes.
5. Recheck high / low pressure readings.
High Pressure: 13 - 19 kg/cm
2
(185 - 270 psi)
Low Pressure: 1.5 - 3.3 kg/cm
2
(21 - 47 psi)
Ye s
Moisture in system, replace
receiver dryer.
No
Contaminated system, replace
expansion valve.
(Replace evaporator core
assembly.)
5
High Pressure: Over 6 - 18 kg/cm
2
(85 - 256 psi)
Low Pressure: 500 mmHg (Negative Pressure) - Dial indicator needle unstable.
Possible Cause: Moisture in system has iced up the expansion valve.
NOTE: When the absorbed moisture freezes the pressure readings may look normal. Careful
readings should be made to determine whether pressure is in normal range.
1. Recover any remaining refrigerant.
2. Vacuum out system.
3. Recharge system.
NOTE: If the system has been exposed to the air for a long period of time, replace the receiver
dryer.
6
High Pressure: Over 22 - 23 kg/cm
2
(313 - 327 psi)
Low Pressure: 2.5 kg/cm
2
(36 psi)
Possible Cause: Refrigerant pressure problem due to defective expansion valve or temperature sensor.
Step Inspection Item Remedy
1
Inspect whether the temperature sensor is
installed properly.
Yes Replace expansion valve.
No Exchange duct sensor.