Title: (Optional) Identify the cause of system failures resulting in refrigerant loss from the A/C system high pressure relief device. (EPA 609 required)
Course: Diesel Equipment Technology III (20107-III) > Section: HVAC: Servicing the Evaporator, Condenser, and Related Components

Identification should include the following possible causes:

- Plugging moisture in the system
- Fan is not operational
- Airflow is restricted

ASE 1: VI. Heating, Ventilation, and Air Conditioning: E. Refrigerant Recovery, Recycling, and Handling

Process/Skill Questions:

- Why would a non-operational cooling fan cause the valve to release?
- Why is moving air so important in an A/C system?