"Diagnosing" car air conditioner suddenly not cool

According to the experience of experienced mechanics, when the car's air conditioner is not working properly, not cool or not cool enough, the driver can think of some of the following reasons:

1. The condenser is covered with too much dust and cannot dissipate heat.If you notice,car air conditioner condenserplaced right in frontmotor fanandwater tank. In this case, you can handle it simply as follows. If you have a water sprayer available or when washing your car, you can use the water sprayer to wash the condenser.

Be careful not to use a water jet that is too strong as it may dent or bend the aluminum radiator fins; because the aluminum fins are quite thin and conduct air through them to dissipate heat, they cannot withstand strong force.

2. Dusty condenserdense arrayso the evaporator fan cannot blow air through; this case can easily lead to the evaporator freezing. Initially, your air conditioner cools deeply, after a while it seems to weaken and then stop completely, you can hear the fan still running inside but there is no wind blowing out.

In some cases, if not cleaned and maintained regularly, the condenser will accumulate a lot of trash, dirt, bacteria, and mold, causing bad odors. Especially after a long period of not using the air conditioner.

3. The thermostatic switch is damaged or incorrectly adjusted.In some cases, the temperature in the air vent has not reached about 15 - 20 degrees, the circuit is cut off. Normally, for cars, it is usually 6 - 9 degrees and for trucks, it is 8 - 12 degrees.

4.Charge out of gaswill cool poorly, in case of severe gas leakage, the pressure drops below normal, the low pressure switch will cut off the circuit, preventing the compressor from operating to protect the car's refrigeration system.

Without this protection part, if there is a lack of gas or no gas, the compressor will still run, causing scratches on the piston, cylinder, or even bending and breaking the compressor. This should be especially noted on truck air conditioners, as some repairmen may forget to install a gas pressure sensor and will not detect this problem.

5. Overcharge gas(symptoms such as the compressor constantly turning on and off, the machine running harder than usual) the cold temperature not only does not increase but also decreases. When the pressure is higher than normal, the parts in the car's air conditioning system will have a reduced lifespan, and the gas pipe is likely to explode.

Overcharging makes the machine heavier, reduces engine power, and consumes more fuel.