HVAC Pro's Guide to A/C High and Low Pressure Ports

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. Any low pressure below 20 psi will begin to freeze the evaporator core and basically reduce the cooling ability. The low pressure switches are ... 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 ... Low Refrigerant Levels · Faulty Compressor · Faulty Dryer · Something Is Blocking the Airflow · Your Car's AC System Is Overcharged · There Is ... Some older posts by p_gill indicate 35-40 psi on the low side and 150-155 psi on the high side, but no reference back to a spec. A/C pressure switches are installed in the high pressure side of the system, between the compressor and the receiver/drier. The objective is to ... The R-134a and R-1234yf pressure charts are for guidance when using A/C Pro® recharge products and gauges. ... Standard Low Side Pressure Range PSI, Standard High ... the low side is closer to the firewall. and will be cold to touch. The orfice tube is locate between the 2 service ports. Of course you can add ... The hard-to-access port down near the belt off a canister attached to the A/C compressor is the low pressure port. The low-side service port is a quick-connect fitting that provides access to the low-pressure side of the A/C system.