Understanding A/C Pressure Ports A Guide for Homeowners

80-100 psi with the engine off is OK. The system just settles out and the pressure equalizes. When you start the engine and when the compressor turns on the 15 ... Learn the 4 main conditions that will cause your vehicle's A/C pressure to have low side pressure that is high and high side pressure that ... The reading of 20 psi on the low side and 210 psi on the high side would indicate a restriction somewhere in your ac system. LOW, LOW, Add Refrigerant. ; LOW, HIGH, Need service, possible blockage of the expansion valve or orifice tube. ; HIGH, LOW, Needs service, possibly faulty ... 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 ... Read the full gpd Tech Tip #29 in English, Spanish, or French at gpdtechtips.com In an automotive A/C system, the compressor is driven by a ... 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 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 ... 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. The low-side service port is a quick-connect fitting that provides access to the low-pressure side of the A/C system.