Title: Identify abnormal operating noises in the A/C system; determine needed action.
Course: Automotive Technology III (20104-III) > Section: Heating, Ventilation, and Air Conditioning (HVAC): General-Air Conditioning (AC) System Diagnosis and Repair

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.

ASE Education Foundation
2017 Automobile Service Technology (AST) Level
VII. Heating, Ventilation, and Air Conditioning (HVAC)
A. General: Air Conditioning (A/C) System Diagnosis and Repair
Task 4

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?