M/T Model
WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Normal pressure values on high side and low side in following table are measured when the ambient temperature is 30 °C. As normal pressure values on high side and low side vary depending on the ambient temperature, be sure to perform following steps first when diagnosing troubles.
- Measure the ambient temperature and using that value, read the normal value from the graph given in Step 10 of A/C SYSTEM PERFORMANCE INSPECTION: MANUAL A/C .
- Put that value in place of the normal pressure in following table.
SYMPTOM DIAGNOSIS DESCRIPTION CHART
| Condition | Possible cause | Correction | ||
|---|---|---|---|---|
| Manifold gauge | MPa (kgf/cm2 ) (psi) | Detail | ||
| Lo | Hi | |||
| 0.25 - 0.35 (2.5 - 3.6) (36.3 - 50.8) | 1.20 - 1.82 (12.2 - 18.6) (174.0 - 264.0) | Normal condition | - | - |
| Negative pressure | 0.5 - 0.6 (5 - 6) (71.2 - 85.3) | The low pressure side reads a negative pressure, and the high pressure side reads an extremely low pressure. Presence of frost around tubing to and from receiver/dryer and expansion valve. |
Dust particles or water droplets are either stuck or frozen inside expansion valve, preventing the refrigerant from flowing. | Replace expansion valve. Replace desiccant and cap with filter. Evacuate the A/C system and recharge with fresh refrigerant. |
| Normal: 0.25 - 0.35 (2.5 - 3.6) (36.3 - 50.8) ↑ ↓ Abnormal: Negative pressure |
Normal: 1.20 - 1.82 (12.2 - 18.6) (174.0 - 264.0) ↑ ↓ Abnormal: 0.7 - 1.0 (7 - 10) (100 - 142) |
During A/C operation, the low pressure side sometimes indicates negative pressure, and sometimes normal pressure. Also high pressure side reading fluctuates between the abnormal and normal pressure. | Expansion valve is frozen due to moisture in the system, and temporarily shuts off the refrigeration cycle. | Replace expansion valve. Replace desiccant and cap with filter. Evacuate A/C system and recharge with fresh refrigerant. |
| 0.05 - 0.15 (0.5 - 1.5) (4.2 - 21.3) | 0.7 - 1.0 (7 - 10) (100 - 142) | Both low and high pressure sides indicate low readings. Output air is slightly cold. |
Insufficient refrigerant in system (Refrigerant leaking). | Using leak detector, check for leaks and repair as necessary. Recharge refrigerant to a specified amount. If the pressure reading is almost 0 when the manifold gauges are attached, check for any leaks, repair them, and evacuate the system. |
| 0.4 - 0.6 (4 - 6) (56.9 - 85.3) | Pressure on low pressure side is high. Pressure on high pressure side is low. Both pressure becoming equal right after A/C is turned OFF. |
Internal leak in compressor. | Inspect compressor and repair or replace as necessary. | |
| 0.40 - 0.45 (4.0 - 4.5) (57 - 64) | 2.0 - 2.5 (20 - 25) (285 - 355) | High pressure reading on both low and high pressure sides. | Overcharged A/C system. Faulty condenser cooling operation. Faulty condenser cooling fan operation. |
Adjust refrigerant to specified amount. Clean condenser. Inspect and repair condenser cooling fan. |
| High pressure reading on both low and high pressure sides. Low pressure side tubing is not cold when touched. |
Presence of air in A/C system (Improperly evacuated). | Replace desiccant and cap with filter. Inspect quantity of compressor oil and presence of contaminants in oil. Evacuate system and recharge with fresh refrigerant. | ||
| 0.45 - 0.55 (4.5 - 5.5) (64 - 78) | High pressure reading on both low and high pressure sides. Large amount of frost or dew on the low pressure side tubing. |
Faulty expansion valve. Refrigerant flow is not regulated properly. |
Replace expansion valve. | |