ESCO Air Conditioning Practice Exam 2026 – The All-in-One Guide to Exam Success!

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After a system has been opened and the compressor changed, the service technician must:

Replace the refrigerant, leak check, evacuate, and charge

After a system has been opened and the compressor changed, the service technician must replace the refrigerant, leak check, evacuate, and charge. This is the correct answer because when the system is opened, it loses refrigerant, which needs to be replaced to the correct level. Additionally, a leak check is essential to ensure no new leaks have been introduced during the compressor replacement process. Evacuating the system removes any air and moisture, which can be harmful to the system's operation. Finally, charging the system ensures it has the correct amount of refrigerant to operate efficiently.

The other options are incorrect because while they may be regular maintenance tasks in some situations, they are not specifically required after changing the compressor in an air conditioning system.

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