Posts Tagged: car AC pressure chart

Understanding Normal AC Pressure Gauge Readings

AC Pressure Readings: What’s Normal and What’s Not Quick Summary (Key Takeaways) • Normal AC pressure gauge readings are directly related to the local ambient temperature and humidity conditions at the time you take the reading, as well as the amount of airflow across the condenser. • A properly functioning R-134a system typically shows 25–55 psi on the low side and 150–300+ psi on the high side, depending on ambient temperature and humidity. • Static pressure must be checked first—if it’s wrong, running readings won’t matter. • Low and high … Read More