The Ultimate Guide to A/C High and Low Pressure Ports

I put the gauges on the a/c test ports and i'm reading 0 psi on the low pressure side and between 100 psi and 125 psi on the high pressure side ... Hi the low pressure port is located on the accumulator, just above the low pressure switch. see attached picture. graphic. Item, Part Number, Description. 1 ... 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 ... LOW, LOW, Add Refrigerant. ; LOW, HIGH, Need service, possible blockage of the expansion valve or orifice tube. ; HIGH, LOW, Needs service, possibly faulty ... The hard-to-access port down near the belt off a canister attached to the A/C compressor is the low pressure port. Well the low pressure is in front of the manifold and the high is on the passenger side of the bay, plus the port sizes are different, so it's ... 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 ... A/C pressure switches are installed in the high pressure side of the system, between the compressor and the receiver/drier. The objective is to ... Very high on the high pressure side and low on the low pressure side. First check to see if the condenser fan is running at full speed. If ... If you have the proper amount of refrigerant in the system, you shouldn't need a high pressure switch. If the compressor stays running and the ...