Understanding A/C Pressure Ports A Comprehensive Guide

I rented the gauge set at Autozone and compressor off,I had approx. 95 psi on high and low side. Compressor on, low: 45-50 high: 198-200 and ... The cap should not allow a leak. Some service ports will leak a little . That is why the external cap is used. Put the cap on and check the port ... 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 ... The high side of the system is the smaller of the two. And on a 134a system the low side port is the bigger of the two. Hope this helps. A. The extremely high pressure on the high side and normal pressure on the suction side indicates that the evaporator is overheating. Turned on wife's A/C in her 02 golf, and it blows out normal air - no cooling feeling at all. I was able to see that the clutch is at least spinning when... WITH the compressor clutch engaged, you should be reading approximately 215psi high side and 35-45psi low side. Jul 6, 2003. #4 · P ... The high pressure port on the hard lines is smaller than the low pressure port on the drier. I have an R134 gauge set, which seems to fit the low pressure port ... Low side should be between evaporator and compressor, and high side should be between condenser and evaporator if you can follow either one. The AC low pressure service port is directly behind the engine, about 5-6 inches back, in the center. Look for the two silver pipes coming out ...