When the cooling cycle is operating normally, the pressure indicated by the gauge manifold should be 21-28 psi on the low pressure and 206-213 psi high pressure side.
The inlet temperature should be between 30-35 ?� C with the engine running at a speed of the crankshaft 2000 -1 at high fan speed.
Symptom | Probable Cause | Remedy | The manometers |
The pressure values at high and low pressure side is too low.
Air outlet slightly cooled. | Leaking refrigerant. | Check and perform repairs.
Add the coolant. | 8 |
| The pressure values at high and low pressure sides is too high. | Defects in the cooling or freezing of the capacitor.
Slippage of the belt. | Maintain required level of coolant. Clean the condenser.
Adjust the belt tension. | 9 |
The pressure values at high and low pressure sides.
The tube of low pressure is not cold. | Air in the system. | Clean or repair the receiver / dryer.
Check oil for contamination. | 10 |
On the low pressure side - negative pressure, but on the side with a high pressure - low pressure.
Drizzle or frost on the tube is connected to the expansion valve and receiver / dryer. | Dust and moisture frozen in expansion valve.
Leaking refrigerant. | Repair the receiver / drier and replace the expansion valve. | eleven |
| On the low pressure side is sometimes normal pressure becomes negative pressure. | Moisture frozen in expansion valve. | Repair the receiver / dryer. | 12 |
The pressure values at high and low pressure sides is too high.
Drizzle or frost on the tubes of the low pressure side. | Faulty expansion valve.
Faulty receiver / dryer. | Repair the receiver / dryer.
Check oil for contamination. | 13 |
| On the side of the low pressure - high pressure, but on the side with a high pressure - low pressure. | A leak in the air conditioning compressor. | Replace the air conditioning compressor. | 14 |
