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

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If oil streaks are observed in the A/C sight glass, what does it usually indicate?

Normal operating condition.

Refrigerant charge is adequate.

Refrigerant charge is low.

The observation of oil streaks in the A/C sight glass typically indicates a low refrigerant charge. Under normal operating conditions, the sight glass should remain clear, without any oil present. When the refrigerant charge is insufficient, it can cause the oil within the system to become more visible as it circulates, leading to streaks appearing in the sight glass.

When refrigerant levels drop, the system struggles to maintain optimal pressure, which can lead to oil being pushed along with the refrigerant. This is a direct sign of an underlying issue, such as a refrigerant leak, which would necessitate further inspection and possibly a recharge of the refrigerant to restore proper function. Therefore, the presence of oil streaks is a critical indicator that requires attention, reinforcing the idea that the refrigerant charge is low.

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Compressor is performing normally.

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