Conquer A/C Troubleshooting High Pressure vs. Low Pressure Port Analysis

Thus, if the gauge is reading high, then it indicates a problem with your compressor in that the low side isn't going low. When the A/C is fully ... Both the low and high side ports are on the compressor itself rather than on the suction and pressure hoses as is more typical of modern cars. Standard pressure on the low side should be between 21 and 36 psi, measured with the blower on high, max cool, engine running at 1500 rpm. Asking because we at the shop charge through the high side port, but it takes way longer and sometimes the machine can't even pump it well ... 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 ... The compressor initially began pulling the low side down to 30 psi, then began to climb in pressure and would cycle off around 70 psi. Preview image for a collapsed post. ... From the FSM: ... On the 1.4L engine, the high side service port is located on the A/C suction line in back ... 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 ... ... low pressure port with the A/C on ... I'm supposing that the compressor has to be engaged or the gauge will show high pressure. The typical low pressure side PSI is between 20 and 50, so 70 is on the high side...although not likely dangerously high. If you're not getting ...