Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam 2025 – Your All-in-One Guide to Exam Success!

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What condition can moisture in an A/C system cause regarding the expansion valve?

It can enhance performance.

It can cause freezing and block refrigerant flow.

Moisture in an A/C system is problematic because it can lead to the formation of ice at the expansion valve, particularly when the refrigerant passes through this component. The expansion valve is designed to regulate the flow of refrigerant into the evaporator, allowing it to expand and absorb heat from the cabin air. If moisture is present, it can freeze at the low temperatures within the expansion valve, creating an ice blockage. This blockage inhibits the proper flow of refrigerant, which can lead to reduced cooling performance or even complete system failure.

Additionally, the presence of moisture can react with refrigerant and oil, potentially forming acids that can further damage the system. The implications of this ice formation can contribute to serious operational issues, underlining the importance of maintaining an A/C system free of moisture for optimal performance and longevity.

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It will evaporate without any effects.

It guarantees longer system life.

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