Empowering Homeowners Understanding A/C High Pressure vs. Low Pressure Ports

The compressor creates high pressure by compressing the low pressure vapor from the evaporator so that the high pressure vapor can release heat at the condenser ... The smaller fitting is the high pressure side. The larger fitting is low pressure side and is for charging. The low pressure side of the A/C is the larger diameter line with the port down beside the lower rad hose above the compressor. The high ... Normal AC Pressures Using R-134A · At a temperature of around 65°F (24°C), the low-side pressure typically ranges from 25 to 35 psi. At an ... High side typically is about 200-250 PSI on a warm to hot day. Low side should be a minimum of 35-40 PSI and locked clutch on the compressor. No cycling. I was trying to find the low pressure port this afternoon. If I have located the current port, it is just right of the high pressure port (If ... Between 125 and 185psi on the high side 35psi to 55psi on the low side. Hold close manifold gauge to check for psi loss while running compressor a/c. Typical pressures when running are 30-40 on the low and 200-250 on the high side. These pressures will change based on ambient temperature and ... The low side port sits right in front of the passenger's side strut tower. It's easily accessible, unlike the high pressure port which is tucked in closer to ... Certified A/C tech and body man here. The port behind your engine is the low pressure port. The high pressure port is under the black plastic ...