Title: Test the cab/sleeper refrigerant solenoid, expansion valve(s), and thermal bulb (capillary tube).
Course: Diesel Equipment Technology III (20107-III) > Section: HVAC: Servicing the Evaporator, Condenser, and Related Components

Testing should include using the manufacturer performance A/C test to determine the proper operation.

Process/Skill Questions:

- What is the cause of a frozen expansion valve?
- Why does the lack of air across the evaporator coil cause it to freeze up?