Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam

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Which of the following is a cause for a clicking or buzzing noise heard from the compressor?

Overcharging the system

A clicking or buzzing noise from the compressor can occur due to overcharging the system with refrigerant. When there is too much refrigerant, it can lead to increased pressure within the compressor. This elevated pressure can cause the compressor to work harder than it is designed to, leading to potential mechanical failures, such as struggling to cycle on and off, which may produce clicking or buzzing sounds.

While lack of refrigerant typically results in other symptoms such as inadequate cooling, and internal compressor damage may exhibit more severe symptoms depending on the extent of the damage, a malfunctioning expansion valve primarily affects refrigerant flow rather than directly causing clicking or buzzing noises. The noise from an overcharged system can often be mistaken for issues from other components, but it is crucial to diagnose it correctly to prevent further damage to the air conditioning system.

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Lack of refrigerant

Internal compressor damage

A malfunctioning expansion valve

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