Title: Diagnose HVAC system clutch control systems; determine needed action.
Course: Automotive Technology III (20104-III) > Section: Heating, Ventilation, and Air Conditioning (HVAC): Operating Systems and Related Controls Diagnosis and Repair

Diagnosis should include

- performing a visual inspection of clutch assembly, looking for evidence of excessive heat or oil contamination of clutch surfaces
- testing all circuits for sufficient voltage and proper grounding while activated
- testing related wiring and control components.

ASE Education Foundation
2017 Automobile Service Technology (AST) Level
VII. Heating, Ventilation, and Air Conditioning (HVAC)
D. Operating Systems and Related Controls Diagnosis and Repair
Task 2

Process/Skill Questions:

- What are the tools needed to test and diagnose problems with the AC compressor clutch control systems?
- What are the procedures to test and diagnose problems with the AC compressor clutch control systems?
- What are the common failures of AC compressor clutch control systems?
- What adjustments might the technician need to make?