Title: Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and/or control module) to interrupt system operation; determine needed action.
Course: Automotive Technology III (20104-III) > Section: HEATING, VENTILATION, AND AIR CONDITIONING (HVAC): Refrigeration System Components

Diagnosis should include

- checking for A/C related DTCs
- checking compressor operation
- connecting A/C gauges to check pressure
- following manufacturer’s information to determine how the system operates.

Process/Skill Questions:

- What are the differences in the service ports?
- Why would a faulty pressure sensor cause the A/C system to malfunction?
- Why is it important to be able to manually command A/C components for diagnosis?