Pingyang chunde auto parts co., LTD. : fault analysis of automotive air conditioning system (III)

  3. Touch the high-pressure tube and low-pressure tube with your hands and carefully feel their temperature. When the refrigeration system is working properly, the normal temperature of the high-pressure pipe is about 50 to 60 degrees Celsius, which means that you can hold it firmly for about 30 seconds. The temperature of the low pressure tube is about 5 to 6 degrees Celsius, which means you can feel the ice hand with your hand.
  This paper by pingyang chunde auto parts co. LTD