Which is the High Pressure Pipe and Low Pressure Pipe in a Car's Air Conditioning System?

[DelIan]

Here are the specific methods to identify the high pressure pipe and low pressure pipe in a car's air conditioning system: 1. Observe the thickness: The thicker one is the low pressure pipe, while the thinner one is the high pressure pipe. The pipe running from the evaporator to the compressor is the low pressure pipe, and the pipe from the compressor to the condenser, then to the receiver-drier and back to the evaporator is the high pressure pipe. 2. Check the letters: The low pressure pipe's service port cap is marked with an "L" (for Low), and the high pressure pipe's service port cap is marked with an "H" (for High). 3. Temperature difference: When the air conditioning is operating normally, the low pressure pipe feels cooler to the touch, while the high pressure pipe feels hotter. Be cautious when touching the pipes for safety reasons.