HVAC Simplified A/C High and Low Pressure Ports for Beginners

The smaller fitting is the high pressure side. The larger fitting is low pressure side and is for charging. I rented the gauge set at Autozone and compressor off,I had approx. 95 psi on high and low side. Compressor on, low: 45-50 high: 198-200 and ... ... low pressure port with the A/C on ... I'm supposing that the compressor has to be engaged or the gauge will show high pressure. The narrower tube is the high-pressure line and the wider one is the low pressure line. Follow the wider tubing from the compressor until you ... I was trying to find the low pressure port this afternoon. If I have located the current port, it is just right of the high pressure port (If ... 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 ... Very high on the high pressure side and low on the low pressure side. First check to see if the condenser fan is running at full speed. If ... I can't help you on which is the high or low side. Your a/c system ... My question is ...from the firewall is the low pressure port on the driver ... 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 ... Low side should be between evaporator and compressor, and high side should be between condenser and evaporator if you can follow either one.