Checking the Air Conditioning (A/C) System Function And For Noise: General

When fault-tracing, the ambient temperature must be at least 18°C or higher.

There is always noise when the air conditioning (A/C) system is running. The reason for this is that the refrigerant changes phase between gas and liquid at different pressures.

The air conditioning (A/C) system pump (compressor) produces a soft buzzing noise.

The A/C compressor will start when the engine is started, even if the air conditioning A/C button is in the OFF position. After a few seconds the air conditioning (A/C) compressor will stop.

The above noises are normal  operational noises from the air conditioning (A/C) system.

This fault-tracing describes partially how to locate and correct abnormal  noise from the air conditioning (A/C) system, such as low frequency rumble or metallic knocking, and partly how to fault trace and correct function problems.

• Continue 

  Refer to Checking the Drive Belt 

When fault-tracing, the ambient temperature must be at least 18°C or higher.

There is always noise when the air conditioning (A/C) system is running. The reason for this is that the refrigerant changes phase between gas and liquid at different pressures.

The air conditioning (A/C) system pump (compressor) produces a soft buzzing noise.

The A/C compressor will start when the engine is started, even if the air conditioning A/C button is in the OFF position. After a few seconds the air conditioning (A/C) compressor will stop.

The above noises are normal  operational noises from the air conditioning (A/C) system.

This fault-tracing describes partially how to locate and correct abnormal  noise from the air conditioning (A/C) system, such as low frequency rumble or metallic knocking, and partly how to fault trace and correct function problems.

• Continue 

  Refer to Checking the Drive Belt