2. It is recommended to periodically check the tightness and efficiency of the air conditioning system.
3. Exercise caution when working on the air conditioning system. Before working on the air conditioning system, read the section "Refrigerant Safety Precautions".
4. When removing and installing some elements, it is necessary to add a certain amount of compressor oil to the air conditioning system. The need to add oil is indicated by the text in the installation procedures for such elements.
5. After performing work that requires disconnecting the pipes or hoses of the system, you must perform:
- filling the air conditioning system;
- evacuation of the system;
- tightness test.
Charging the air conditioning system is the procedure for filling the system with refrigerant. When charging the system, it is necessary to strictly follow the recommendations for the amount of refrigerant. Lack of refrigerant reduces the efficiency of the air conditioning system and can lead to compressor failure. Overcharging the system leads to insufficient cooling, excessive fuel consumption, engine overheating, etc.
Vacuuming is a procedure for removing air from the air conditioning system. The presence of air in the air conditioning system can lead to reduced efficiency or damage to the air conditioner.
A leak test is a procedure designed to detect leaks in an air conditioning system. Leaks in the system will lead to a lack of refrigerant in the system, which in turn can cause a decrease in the efficiency of the air conditioning system or lead to compressor failure.
If special equipment is available, refuel (evacuation, leak test) air conditioning systems. When performing the procedure, follow the instructions for the devices and the data in the table "Specifications". In the absence of special equipment, contact a specialized service for refueling procedures (evacuation, leak test) air conditioning systems.
Specifications
6. Location of fittings for connecting a block of pressure gauges and / or equipment for filling the system.
Note:
- The fittings of the air conditioning system are located in the engine compartment and are closed with caps.
- High and low pressure fittings differ in diameter.
The high pressure fitting is usually located on the high pressure line between the compressor and the condenser, or between the condenser and the air conditioning unit in the cabin.
The low pressure fitting is usually located on the low pressure line between the air conditioner unit (in the cabin) and air conditioning compressor.
Note: the location of the fittings can be determined from the drawing "Cooling lines" of this chapter.
Refrigerant pressure test
1. Install gauge block
2. Set the idle speed to 1500 rpm.
3. Set the maximum fan speed for the heater.
4. Turn on the air conditioner.
5. Set mode "RECIRCULATE".
6. Switch the temperature control lever to the position "MAX COLD".
7. Set mode "VENT".
8. Close all doors and windows.
9. Measure the outside temperature and the pressure gauges connected to the low pressure circuit and the high pressure circuit.
10. Verify that the outdoor temperature and gauge readings are in the shaded area of the graphs.
Checking the efficiency of the refrigerant circulation system
1. Follow the steps described in subsection - "Refrigerant pressure test".
If the pressure does not match, troubleshoot the air conditioning system.
If the pressure is correct, proceed to the next step
2. Install the thermometer in the central deflector on the driver's side.
3. Set the idle speed to 1500 rpm.
4. Set the heater fan speed switch to position "MAX HI".
5. Turn on the air conditioner.
6. Set mode "RECIRCULATE".
7. Switch the temperature control lever to the position "MAX COLD".
8. Set mode "VENT".
9. Close all doors and windows.
10. Wait until the temperature of the air outlet from the deflector stabilizes. The outlet air temperature must be constant and the compressor must be switched on and off at regular intervals.
11. Measure the temperature of the air leaving the deflector.
12. Measure the outside air temperature.
13. Verify that the temperature of the air leaving the deflector falls within the center zone of the chart according to the outside air temperature.