Caution: The air conditioning system is under high pressure. Do not attempt to loosen any connections or remove parts of the system without first discharging the system. The refrigerant must be removed from the system in a specialist workshop (the type of refrigerant used is given in Specifications). Even after the system has been discharged, wear protective goggles when performing any operations on the system.
1. In order for the air conditioning system to function properly, the following operations must be carried out regularly:
- Check the condition of the drive belt. If excessive wear or damage is found, the belt must be replaced (refer to Section Checking the condition of the ribbed belts of the serpentine drive of auxiliary units and Head Engine).
- Check the condition of the system piping. Inspect them for cracks, blisters and seals. Also inspect the fittings for signs of leaks. If signs of wear, damage or leaks are found, replace the damaged piping.
- Inspect the surface of the heat exchanger located in front of the radiator of the cooling system. When fins, insects, etc. are found to be dirty. clean the surface of the heat exchanger with a special brush or compressed air.
- Make sure the evaporator drain tube is not clogged. When the air conditioner is on, clean water should ooze out of this tube. To check the cleanliness of the tube, place a sheet of paper under the evaporator and turn on the air conditioner. After a certain period of time, traces of water should appear on the sheet.
Caution: Wear safety goggles when using compressed air.
2. Turn on the air conditioner at least once a month (even in winter). If the air conditioner is not used for a long time, the seals may fail.
3. Due to the complexity of the system, diagnostics and repairs must be carried out at a workshop.
4. The most likely cause of system performance degradation is insufficient refrigerant. If you notice a drastic reduction in system performance, check the amount of refrigerant in the system as follows.
5. Warm up the engine to operating temperature.
6. Use the switch to select the lowest supply air temperature. Turn on the highest fan speed. open the doors (so that the system does not turn off after reaching the required temperature in the cabin).
7. When the compressor is turned on, the clutch should make an audible click and the center of the clutch should rotate. Feel the inlet and outlet pipe of the compressor. One of them should be cold, the other hot. If you don't feel a difference, the system is faulty. This can be caused by a lack of refrigerant or something else. To troubleshoot, contact the service station.
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