HVAC Professionals Guide High Pressure vs. Low Pressure Port Management

Start at the A/C compressor. It's attached to the front of the engine and powered by a belt and pulley. It can be at the top or down along the side of the ... Also when the compressor is running, the low pressure or suction side is the hose that is cold or has condensation on it. As Robroy mentioned, ... 250psi isn't too high. The a/c pressure switch turns off the compressor if the pressure is below 28psi or higher than 460psi. The high-side charge port is a quick-connect fitting that provides access to the high-pressure side of the A/C system. 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 ... 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 ... Normal AC Pressures Using R-134A · At a temperature of around 65°F (24°C), the low-side pressure typically ranges from 25 to 35 psi. At an ... High side typically is about 200-250 PSI on a warm to hot day. Low side should be a minimum of 35-40 PSI and locked clutch on the compressor. No cycling. 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 ... Low (suction)side is the larger of the two lines, high side is smaller. Suction line should be cool or cold, high side is hot.