A/C High Pressure vs Low Pressure Port A Detailed Guide

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 ... Typically, when the pressures are equal, and the compressor is engaged, then the compressor is bad. That said, those compressors don't usually fail internally ... 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 ... Typically the low pressure port is located close to the AC accumulator and not the compressor although it is possible as this is a conversion. Low side should be around 20-30. If your high and low pressures are always equal with the pump running, your expansion valve/orifice tube is likely bad. The narrower tube is the high-pressure line and the wider one is the low pressure line. Follow the wider tubing from the compressor until you ... 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 ... 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 ... 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. As noted, you need some real gages. I suspect your high reading is while the compressor is cycled off, in which case high side and low side will ...