You would have been sweltering in your room because of a repaired air cooling system. You could have called for the technician. But he would not have turned up on time and hence the suffering. Here is a short guide on how an air conditioner works, why it did not work and few simple steps on how you can do it. Basic principle of an Air Conditioner working The centralized air conditioner is a complex system with two separate setups. One is for interior and the other for exterior. The main components of the air conditioning system are condenser and evaporator. Coolant line tubes run throughout the house in every room of the house so as to wave cool breeze and absorb the heat from the house and blow it outside. Take the instructions manual given along with your air conditioner at the time of its purchase. Make a detailed study on the various parts of the air conditioner and learn how to reassemble and assemble it. Now let's see the most commonly faced problems. Please be prepared with the basic tools such as screw drivers, testers and wrenches etc. I. Air conditioner not cooling the room Cleaning the Filter and compressor unit This is the most routine problem. The thing here is the system needs a thorough clean up. Lots of dust particles would have accumulated in the compressor filter preventing the spread cool waves into the room from the air conditioner. Switch off the power and open the compressor unit. Carefully take the grilled unit off the compressor and clean the dust and dirt particles. Now take out the filter and make a thorough cleaning with a soft brush. The oiling the motor With the help of the user manual, reassemble the unit to reach the motor. Once the motor is opened, lubricate it finely with oil and then assemble the unit properly. Now turn on your air conditioner and check if it is working fine. II. Frequent switching off of the compressor The electric fuse and the circuit have to be tested. Please make complete check up of the electric socket and connections. Ensure there is no loose connection in the cables. III. Frozen Coils There are chances of ice getting blocked in the coils and hence preventing the free circulation of air. Hence remove the top grill and carefully clean the inner coils. IV. Deafening noise from Air conditioner Sometimes long wailing deafening noises are heard from the air conditioner. These noises occur because of the displacement of the fan belt. Restoring the fan belt to its original place as mentioned in the instructions manual will set right the things. V. Bad foul odor Everything will be working fine but we may realize a bad odor being released from the cooler system. This is because of the moisture being deposited in to the system and it results in the formations fungi, molds and other organisms. Cleaning the equipment and setting right the evaporation system would set right this. Having gone through the basic repairing procedures you can save your money in hiring the technicians to fix small faults such as these.