A/C Diagnostics 101 The Significance of High vs. Low Pressure Ports

... 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. #### Which also requires bumper cover removal. My low pressure side read 40ish psi on a 70 degree day with Compressor running and air blowing ... 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 ... 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 ... 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 ... When the compressor is running, the suction side looses some pressure and the high pressure side gains some pressure. This is what pushes the ... LOW, LOW, Add Refrigerant. ; LOW, HIGH, Need service, possible blockage of the expansion valve or orifice tube. ; HIGH, LOW, Needs service, possibly faulty ... Locate the Low-Side Service Port ... This port is typically found on the line connecting the accumulator and compressor. The high side fitting is located between ... 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 ... Between 125 and 185psi on the high side 35psi to 55psi on the low side. Hold close manifold gauge to check for psi loss while running compressor a/c.