How to Fix the Air Conditioning in a Car

Published: 13th May 2009
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Copyright (c) 2009 Rod Hoss

Air conditioner in car has become a necessity these days. It is very difficult to travel in a car without an AC in scorching heat. The car AC is very small and the designing and the functioning is completely different from that of the air conditioners used in offices and homes. There are two sides of an air conditioning system of a car, viz high side and low side. The compressor of the AC begins at the high side, and performs the functioning of the pump. The refrigerant is moved through the system with the help of the compressor. The expansion valve is there at the low side, which restricts the flow of refrigerant. This helps in reducing the temperature and the pressure of the refrigerant.

The car air conditioner works almost like a refrigerator and has a multi-component piece of machinery. The warm air is removed from the car and the cool air is pushed inside the car. This helps in maintaining the temperature of the small space in the car, and moderates the area.

There may be times when the AC in the car stops working or does not give effective cooling. A repair is required at this stage. Each and every car is made of different design and model. But, the basic functioning of the AC in most of the cars is the same. The basic problems with the car air conditioner and the basic ways to fix the problems of car air conditioner have been listed below:

Absence of cool air and improper cooling are the signs of problems with respect to the car air conditioner.

In order to diagnose the problem with your car air conditioner, it is very important to have proper information and knowledge of the different parts of the car air conditioner. There are five components of the car AC viz the compressor, the condenser, the expansion valve, the refrigerant, and the dryer or evaporator.

It is very important to understand the functioning of all the parts so that the right action can be taken in case of any problem.

The refrigerant is pumped out through the compressor. The compressor acts as a power unit of the car air conditioner.

The condenser performs the function of changing the refrigerant to the liquid form.

The liquid formed through the condenser is converted into cold air with the help of the evaporator or the dryer.

There may be some pressure on the condensed refrigerant. This pressure is removed with the help of the expansion valve and moved into the evaporator.

In case of ineffective cooling, check the refrigerant for any kind of leakage. A fluorescent dye that is readily available at any auto part shop can be used to check the refrigerant. Autozone or NAPA can be used as the fluorescent dye.

The instructions given on the pack of the dye that you purchase should be followed completely and carefully. In most of the cases, the dye is added through the low pressure A/C recharge port that is found on the canister of the air conditioner of the car.

Use the U/V light to check for the leakage. In case of leakage of the refrigerant, the refilled kits can be bought from any auto supply store. These refilled kits are sealed and the replacement can be done by anyone at home.

In case this is not the problem, check for any kind of problem with the fuses, wires, and fan belts. The fuse may have turned bad. The wires might have broken, and the belts of the fan may have got damaged. All these problems may be creating trouble with the functioning of the pump. In case of any problem with any of these parts, get the parts replaced to ensure proper functioning of the car air conditioner.

The air conditioner should be tested after making any kind of repair done by you.

In case one has tried all the above methods to make the AC function properly, and even after replacing all the parts, the AC does not function properly, then there is a need to call a professional.


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