MACS 609 Certification Practice Exam

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Prepare for the MACS 609 Certification Test with comprehensive study materials and interactive quizzes. Explore multiple choice questions with detailed explanations to excel in your exam!

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Which statement is correct about flushing A/C systems?

Flushing solvents are harmless
Flushing solvents can remain in A/C systems, causing problems
Flushing should be avoided
Flushing improves system performance

The correct answer is: Flushing solvents can remain in A/C systems, causing problems

Flushing solvents can indeed remain in A/C systems, causing problems. When an A/C system is flushed, the intent is to remove contaminants, debris, and old oil. However, if the flushing solvent isn't entirely eliminated from the system after the procedure, it can mix with the refrigerant and lubricants within the A/C system. This residual solvent can lead to several issues, such as degradation of the lubricating properties, which is essential for the compressor's longevity and functionality. Additionally, residual solvents can result in a chemical reaction with the refrigerant, potentially leading to system inefficiency or even damage. Therefore, it is crucial to ensure that any flushing solvent used is thoroughly removed to prevent complications in the A/C system's operation.