HVAC Troubleshooting Masterclass High Pressure vs. Low Pressure Port Analysis

The picture in the post above would be my high side port. The recharge hose will only fit the low side. So you might be messing with the high ... The hard-to-access port down near the belt off a canister attached to the A/C compressor is the low pressure port. Turned on wife's A/C in her 02 golf, and it blows out normal air - no cooling feeling at all. I was able to see that the clutch is at least spinning when... 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. 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. Any low pressure below 20 psi will begin to freeze the evaporator core and basically reduce the cooling ability. The low pressure switches are ... 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 ... if u have 100 psi lo, 100 psi high USUALLY means compressor clutch is not engaging. what i always do before jumping to conclusions is charge 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 ... 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 ...