High pressure gauge
A/C SYSTEM INSPECTION CHART - HIGH PRESSURE GAUGE
| Condition | Possible Cause | Correction |
|---|---|---|
| Pressure is higher than acceptable range ("A" area) | Refrigerant overcharged | Recharge. |
| Expansion valve frozen or clogged | Check expansion valve. | |
| Clogged refrigerant passage of high side | Clean or replace. | |
| Radiator cooling fan malfunction (Insufficient cooling of condenser) | Check radiator cooling fan. | |
| Dirty or bent condenser fins (Insufficient cooling of condenser) | Clean or repair. | |
| Compressor malfunction (Insufficient oil etc.) | Check compressor. | |
| Engine overheat | Check engine cooling system referring to ENGINE COOLING SYMPTOM DIAGNOSIS . | |
| Pressure is lower than acceptable range ("B" area) | Insufficient refrigerant (Insufficient charge or leakage) | Check for leakage, repair if necessary and recharge. |
| Expansion valve malfunction (valve opens too wide) | Check expansion valve. | |
| Compressor malfunction (Insufficient compression) | Check compressor. |