What is the normal high pressure for a car air conditioner?

[HarperLynn]

The normal high pressure for a car air conditioner should be 1.3-1.7MPa. Below is relevant information about car air conditioners: 1. Air conditioner layout: Different types of air conditioning systems have varying layout methods. Currently, most passenger cars widely adopt integrated heating and cooling air conditioning systems. The layout involves assembling components such as the evaporator, heater core, centrifugal blower, and control mechanisms together, collectively referred to as the air conditioner assembly. 2. Air conditioner components: Modern air conditioning systems consist of a refrigeration system, heating system, ventilation and air purification devices, and a control system. A car air conditioner generally comprises components such as the compressor, electronically controlled clutch, condenser, evaporator, expansion valve, receiver-drier, pipelines, condenser fan, vacuum solenoid valve, idle speed controller, and control system. Car air conditioners have high-pressure and low-pressure lines. The high-pressure side includes the compressor output side, high-pressure lines, condenser, receiver-drier, and liquid lines; the low-pressure side includes the evaporator, accumulator, suction lines, compressor input side, and compressor oil sump.

[StTessa]

I've encountered quite a few AC issues when repairing cars. The normal range for high pressure is generally between 1.5 to 2.0 MPa, and it's common to see slightly higher readings in hot weather. If it exceeds 2.5, you should be cautious—it might be due to clogged condenser fins or insufficient fan speed. Last time, there was a car owner who didn't address the issue even when the pressure reached 3.0, and the compressor ended up completely failing, costing nearly ten thousand to fix. I recommend a comprehensive check-up before each summer, using pressure gauges to measure both high and low pressures, especially for older cars over five years, as aging pipelines can become a serious issue.

[DelJosie]

The normal high-side pressure of a car's air conditioning system is around 14 to 18 bar, which converts to approximately 200 to 260 psi. During testing, remember to keep the engine at 1500 RPM with the fan on maximum speed and in cooling mode. High pressure is commonly caused by overcharging of refrigerant or a dirty condenser with poor heat dissipation; low pressure may indicate refrigerant leakage or a clogged expansion valve. Different car models may vary, with German cars typically having about 10% higher pressure than Japanese cars. Pressure gauges are not difficult to obtain and can be purchased for a few dozen dollars, but DIY attempts may risk refrigerant leakage, so it's safer to visit a professional shop.

[DiGenevieve]

Poor cooling performance when using the air conditioning in summer is often caused by abnormal high pressure. Under normal operating conditions, the high pressure should fluctuate between 1.5 and 2.0 MPa. The most typical issue I've encountered is a faulty cooling fan causing the pressure to surge above 2.8, triggering compressor overheating protection shutdown. Regular cleaning of insects and leaves from the radiator and condenser is crucial, as reduced cooling efficiency will inevitably lead to increased pressure. Additionally, aging rubber seals at the AC piping connections can slowly leak refrigerant, resulting in lower pressure.