Identification should include
- determining the source (e.g., compressor, clutch, belt, pulleys, fans, refrigerant restrictions, blend door, heater blower motor) of any unusual noise
- following service materials and manufacturer guidelines to form a solution.
Process/Skill Questions:
- What can cause abnormal operating noises?
- How would a technician diagnose an abnormal noise in an AC system?
- What service precautions should be taken when working on an AC system?