Six reasons for non cooling of car air conditioning

Reason 1: Lack of refrigerant for car air conditioning not cooling

Car air conditioners usually add refrigerant once every 2-3 years, and some cars even have a very large number of car owners who add refrigerant once a year. Has the refrigerant in the car flown away? Why do we need to add it frequently? Isn't the air conditioner equipped with a sealing device? Moreover, according to the physical reaction of air conditioning refrigeration, there is no need to consume too much refrigerant. Why is it gone. In fact, even if the air conditioning seal is very tight, it cannot withstand the refrigerant flying away, coupled with slight leaks in the air conditioning pipeline or condenser.

The loss of refrigerant is mainly caused by leakage. If your car experiences poor air conditioning and starts to malfunction after adding refrigerant for a period of time, then you should pay attention. Usually, this situation occurs with a rhythm of bleeding. If the condenser leaks, it needs to be replaced, and the method of checking for leaks is also quite laborious. Generally, adding fluorescent agents to the fluorine oil and using special glasses to check can reveal where the dew point is! There is also a relatively simple method suitable for severe leakage, where the surface of the condenser can be seen to be wet and oily through the middle screen. In this case, it is generally due to the presence of leakage in the condenser.

Reason 2 for non cooling of car air conditioning: Damaged air conditioning flap

Damage to the air conditioning flap motor is a rare and not uncommon fault. If there is a problem with the flap motor, it will be troublesome. The flap motor is usually located in the middle and lower part of the dashboard, which is the main switch of the air conditioning air outlet. If it is broken, it means that the switch is broken. Even if the air conditioning can cool down, cold air can only come out from the crack, which has the meaning of drinking poison to quench thirst. When you find that all the air out does not come out after turning on the air conditioner, you need to be careful. Replacing the flap motor requires dismantling the dashboard, which would be a huge project.

Reason 3 for non cooling of car air conditioning: The condenser is too dirty

In summer, poor air conditioning is often found. When checking the air conditioning system, there are no issues, and the high and low pressures are basically normal. When repairing a car at a 4S store, car owners are often recommended to do a water tank cleaning activity. The main purpose of cleaning the water tank and condenser is to dissipate heat. In spring, the willow catkins and willow catkins all stick to the condenser, which can cause the engine temperature to be too high or the air conditioning to be poor. Therefore, every spring, car owners must check whether there are many hairs on the water tank. When cleaning, be sure to use a blowing gun to blow it clean first. Otherwise, it will backfire and not only cause poor air conditioning but also increase fuel consumption.

Reason 4 for non cooling of car air conditioning: Damaged air conditioning compressor, throttle valve, or expansion valve

There is a saying in the air conditioning compressor industry that says "low pressure high, high pressure low, compressor replacement is necessary", and I don't know if it is so insightful that the senior can summarize it. The probability of damage to the air conditioning compressor is not high, so we don't need to be too concerned. As for the failure of the expansion valve and throttle valve, it directly leads to poor air conditioning. These inspections are quite cumbersome and require finding a professional repair shop for repairs.

Reason 5 for non cooling of car air conditioning: Belt aging and looseness

After checking all the equipment related to the air conditioning, it was found that there were no problems. So what exactly is the problem. In fact, the belt is also a relatively neglected component. Generally, the 4S store reminds you to replace the belt during maintenance. If it is not replaced during use, it may slip and cause belt breakage, abnormal noise, lack of power assistance, and poor air conditioning. So it is also very necessary to check the engine belt.

Reason for non cooling of car air conditioning 6: Water in the pipeline

There is a drying tank in the refrigeration system of car air conditioning, whose main task is to absorb moisture from the refrigerant and prevent excessive refrigerant moisture from causing a decrease in cooling capacity. When the desiccant in the drying tank is in a saturated state, the moisture cannot be filtered out again. When the refrigerant passes through the expansion valve orifice, due to factors such as pressure and temperature, the water in the coolant will freeze in the small hole, resulting in poor refrigerant flow, increased resistance, or complete inability to flow, resulting in the air conditioning not being able to cool.

There are many reasons for poor air conditioning, such as malfunctions in car temperature sensors and outdoor temperature sensors, and there are many very small reasons that cannot be checked. Don't worry if there is a poor air conditioning, eliminate these six points, and there will be basically no problems.