The lack of air conditioning in automotive air conditioners or the lack of air-conditioning is a common failure of air conditioners. It is more common in refrigeration system sealing problems because of the strong permeability of the refrigerant R134a used in automotive air conditioners. To sum up, there are three main aspects:
First, the air conditioning system mechanical failure
1, compressor failure
(1) Whether the drive belt is aging, cracked, loose or too tight, affecting power transmission.
(3) Compressor head gasket helium, intake and exhaust valve damage, affect compression performance.
2, condenser and fan failure
(1) Whether the heat sink is covered with oil or dust and affects heat dissipation.
(2) Whether the fan is working well.
3, liquid storage dryer
Contains filter and desiccant. If the filter is clogged, it may affect the flow of refrigerant; if the desiccant fails, it will affect the ability to absorb water and may cause ice blocking. The normal desiccant is blue and the saturated desiccant is red.
4, expansion valve failure
The opening and closing of the valve opening of the expansion valve control the flow of liquid refrigerant into the evaporator, and plays a role in adjusting the cooling capacity. If the valve port is always opened too large, the amount of refrigerant inflow is large, and the evaporator surface is too cold and frosted, resulting in long-term cooling stop; if the valve port is always opened too small, the amount of refrigerant inflow is small, resulting in insufficient cooling.
5, evaporator
Whether the heat sink is covered with oil and dust, affects the heat exchange; whether it is deformed or not.
Second, air conditioning system electrical circuit failure
Pressure sensors, temperature sensors, thermostats, electromagnetic clutches for compressors, high and low voltage protection switches, and temperature sensing packages for expansion valves.
Third, the failure caused by refrigerant and refrigeration oil
1, too much refrigerant caused by insufficient cooling.
Too much refrigerant, heat slowly distributed. If too much refrigeration oil is added during maintenance, the cooling capacity of the cooling system will also be reduced.
Maintenance method: Observe from the sight glass above the drying tank. If the car air conditioner is not seeing any bubbles from the sight glass while the air conditioner is running, there will be no bubbles after the compressor is stopped. That is, there must be too much refrigerant. If the added amount of refrigerating machine oil is too much and the air conditioning system is operating normally, more turbid bubbles can be seen from the sight glass. If it is too much refrigerant, you can slowly release some of the air conditioning system on the low-pressure side of the repair port.
2. Insufficient cooling due to too little refrigerant
The cause of the shortage of refrigerant is mostly due to the slight leakage of refrigerant in the system.
Inspection method: Insufficient refrigerant can also be observed from the sight glass above the drying tank. When the air conditioner operates normally, if there are continuous and slow bubbles in the liquid lens, the refrigerant is insufficient. If there is a noticeable bubble reversal, this indicates a serious shortage of refrigerant.
3, the air in the system leads to insufficient cooling
Air is difficult to compress into liquefied gas, so the air entering the refrigeration system will increase the compressor discharge pressure and exhaust temperature, resulting in a decrease in the output cooling capacity.
Cause: The sealing of the refrigeration system has deteriorated, or vacuum has not been thoroughly applied during maintenance.
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