Your Car Air Conditioner is not working properly? Check out

Car air conditioner is designed to move heat from inside of your car to outdoors.

Become familiar with the major components to auto air conditioning:

The Compressor: which compresses and circulates the refrigerant in the system. The refrigerant, which carries the heat and the condenser, which changes the phase of the refrigerant from gas to liquid and expels heat removed from the car.

The Expansion Valve: which is somewhat of a nozzle and functions to simultaneously drop the pressure of the refrigerant liquid, meter its flow, and atomize it

The Evaporator: which transfers heat to the refrigerant from the air blown across it, cooling your car

The Receiver/Dryer: which functions as a filter for the refrigerant/oil, removing moisture and other contaminants

Following are some of the possible reasons of your Car a/c is not functioning properly:

1. Check to see if there is gas leakage:
Leaks are easy to mark. Most auto-supply stores carry a fluorescent coloring that can be added to the system to check for leaks.

2. Make sure the compressor is turning:
Start the car, turn on the AC and look under the top. The AC compressor is generally a pump-like thing off to one side with large rubber and steel hoses going to it.

3. Look for other things:
Bad switches, bad fuses, broken wires, broken fan belt or seal failure inside the compressor.

4. Feel for any cooling:
If the system cools, but not much, it could just be low pressure. You can top up the refrigerant. Most auto-supply stores will have a kit to refill a system. Do not overfill!

Talk intelligently to car mechanic of your nearest car service station for your car a/c problems.

Source: http://www.wikihow.com/Fix-Your-Car’s-Air-Conditioner