When troubleshooting low pressures in an A/C system, which factor should be prioritized first?

Prioritizing airflow when troubleshooting low pressures in an A/C system is crucial because improper airflow can significantly impact the overall performance of the system. When there is restricted or inadequate airflow over the evaporator coil, the coil cannot effectively absorb heat from the air, leading to insufficient cooling and causing low-pressure readings.

If airflow is compromised due to dirty filters, blocked vents, or malfunctioning fans, it can mimic symptoms similar to low refrigerant levels or other issues, complicating the diagnostic process. By checking and ensuring proper airflow first, technicians can confirm that the system is operating under optimal conditions for heat exchange, which is essential before moving on to checking refrigerant levels, electrical components, or ductwork. Addressing airflow issues can often resolve low-pressure problems without needing to investigate further, streamlining the troubleshooting process.