What is the first step taken to secure a major pin hole leak in the A/C system?

The first step taken to secure a major pinhole leak in the A/C system is to open the panel and send refrigerant to the tank. This action is crucial because it helps to mitigate the immediate effects of the leak by safely reclaiming the refrigerant before it escapes into the atmosphere. This step effectively reduces the pressure in the system, which can prevent further leakage and potential damage to the A/C unit.

Once the refrigerant is sent to the tank, it is important to follow up with additional actions to fully secure the leak, but managing the refrigerant is a priority to ensure safety and maintain system integrity.