What is the standard pressure for car air conditioning?
2 Answers
The standard pressure for car air conditioning is as follows: 1. The normal high pressure should be within 1.3-1.7MPa (13-17kg/cm2 or 190-250Lbf/in2); the normal low pressure should be within 0.15-0.25MPa (1.5-2.5kg/cm2 or 20-35Lbf/in2). 2. In idle conditions, if the ambient temperature is high, such as under direct sunlight in summer, the high pressure may be slightly higher, up to about 2.5~2.8MPa, but generally should not exceed 3.1MPa. If the low pressure is higher or lower than this range, it indicates that the expansion valve is not regulating properly.
I've been driving for over a decade, and regularly checking AC pressure is part of my maintenance routine. Standard pressures are divided into high and low sides: the low side typically ranges between 25-45 psi, while the high side is around 150-250 psi, depending on your car's refrigerant type - common R134a falls within this range. Higher pressure in hot weather is normal, while it drops in winter. Last time my AC cooled slowly, measurements showed low pressure; recharging the refrigerant fixed it. For frequent long-distance drivers, proper pressure control helps AC systems save energy and last longer. Don't let it exceed limits for too long to avoid component damage. Regular gauge checks are an inexpensive way to prevent major repairs.
