HVAC System Efficiency The Role of High and Low Pressure Ports

What were the pressure readings on the High and low side when you were charging the system? is your condenser clean and you can see thru it? 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. 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 ... 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 ... 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 ... High pressure you would turn the r134a can upside down to charge and right side up in the low side. I planned to go look pressure side, but then ... 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 ... Typical on most auto a/c systems, it should cut out around 23psi on the low side, and the problem you descibe, it could be cutting out on the ... With the engine off and sitting for a while, both high and low should be about the same. Roughly the same pressure (psi) as the outdoor temperature in degrees ... ... LP & HP are Too High 3:34 Learn how to spot the issues in any AC climate system using r134A, just by reading the pressures of the system. ####