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Replace a Spare part AC Compressor (Air Conditioner Compressor) – a defective one or if the limit of use has been already reached. Find out useful information about AC Compressor (Air Conditioner Compressor)

Compressor is one of the main system components. Its main function is to compress gaseous coolant or low pressure coolant, as well as ensuring the circulation of the coolant in the system. Today more then 40 compressor kinds are used. But widely used are two types - piston and rotary-vane. Conditioner of first type has one or more pistons that are connected according to different schemes. Also, it is necessary to mention that as a rule, modern car compressors have several pistons. When the shaft starts to rotate, the pistons are moved in the axial direction with the help of a swash plate, which causes the coolant compression.

Vane-type compressors have a rotor, which has multiple vanes and precision-shaped body. When the vanes start to rotate, cavities with a variable volume are formed, where the coolant gets through an inlet opening. Due to the rotation of the rotor cavity volume decreases. Moreover, inlet opening is situated where the vanes are the smallest, but the coolant has the highest pressure. When the air conditioner operates, the compressor takes the car engine capacity from 1.5 to 15 horsepower.

The main breakdowns of this component are wearing of the working surfaces of the compressor, failure of valves and failure of the matching device. Typically, the reasons for this are worn compressor, lack or excess of coolant in the system, the cooling fan failure, which leads to increased stress and wear of the compressor and coolant circulation loss.

If you need to change compressor, fan or air conditioner wiring, do not hurry to buy all these car parts in garages. If you really want to buy quality auto parts and thus significantly save, take a look at our catalogue of spare parts. Moreover, the speed of delivery and customer service will be a pleasant surprise for you.

AC Compressor (Air Conditioner Compressor) for MERCEDES-BENZ E-CLASS (W211), FORD MONDEO III Estate (BWY), VW POLO Saloon (9A4)

Faults of air conditioning compressor
  • worn or damaged drive belt;
  • cooling agent leakage;
  • fault of compressor clutch;
  • wear or melting of the electromagnetic coil;
  • mechanical damage to the body;
  • jamming of compressor valves;
  • closure or damage to the electrical circuit.
Symptoms of air conditioning compressor faults
  • noises at the air conditioner start and performance;
  • impossibility of controlling the air flow temperature;
  • strange smell in the cabin.
Causes of compressor faults
  • untimely preventive maintenance;
  • failure to comply with the air conditioner operation rules;
  • use of low-quality components;
  • depressurization of the circuit;
  • adverse climatic conditions of work (high humidity, large temperature fluctuations);
  • ignoring the system operation rules;
  • use of low-quality refrigerant;
  • insufficient or excessive amount of cooling agent in the system;
  • lack of or insufficient amount of lubricant in the compressor;
  • the air conditioner pipeline damage;
  • engine fan failure.

Operation of the air conditioning compressor is checked on a special stand or directly on the car. Operating pressure in the part is measured. At inlet normal Freon pressure should be in the range of 2-3 atmospheres. The gas is compressed to 15-25 atmospheres. If the compression degree is low, cooling will be too weak.

Further the compressor oil is analyzed. Presence of impurities, oxides or water indicates the system leakage. In addition, the oil dark color or the burning smell is a sign of the compressor overheating during operation. It should be noted that prolonged mechanism overheating leads to chemical decomposition of oil that will soon cause total failure of the compressor.

When measuring the pressure, the gauges readings must be flat and rise gradually. Sharp jumps of compression may be the cause of the fault drive, or clogging of the compressor.

Repair and replacement of the compressor parts

An experienced mechanic can carry out repair work for minor damage to the compressor. After the compressor diagnosis and troubleshooting it is necessary to disassemble and carry out a complete cleaning. Damage assessment of components determines minor faults. After their elimination control performance check of the compressor is done on the bench.

In case of more than half the compressor parts defects or failure of the electromagnetic clutch repairs are not carried out, it is necessary to do only a replacement.

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