ASE S7 Air Conditioning Systems & Controls (School Bus) Practice Questions - ASE S7 - Air Conditioning Systems & Controls (School Bus) Certification Exam

Before opening any school bus A/C refrigerant line for service, the technician must first:

Add dye to the system Recover the refrigerant with certified recovery equipment Run the engine at high idle for 10 minutes Disconnect the bus batteries

Correct Answer:

Recover the refrigerant with certified recovery equipment

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