What are the reasons for the high-pressure pipe of the car air conditioner not being hot?
2 Answers
The reasons for the high-pressure pipe of the car air conditioner not being hot are as follows: 1. Severe shortage of air conditioning refrigerant. 2. Excessive opening of the expansion valve. 3. The compressor is not working. 4. The compressor is damaged. 5. There is a leak in the air conditioning system. 6. The air conditioning pipeline is blocked. Relevant information is as follows: 1. The car air conditioner is the abbreviation of the air conditioning system in the car. It refers to the regulation and control of temperature, humidity, and air cleanliness in the enclosed space of the car. 2. The car air conditioner is mainly composed of a compressor, expansion valve, high-pressure pipeline, low-pressure pipeline, evaporator, evaporator temperature sensor, refrigerant, etc.
I've been repairing cars for over a decade, and the issue of the AC high-pressure line not getting hot is extremely common. The high-pressure line should be scalding hot - if it's not, there's an 80% chance the refrigerant is depleted or leaking. You should first check the high/low pressure gauge readings. If the low-side pressure is very low and the high-side temperature isn't rising, it's almost certainly a refrigerant shortage. Of course, the compressor might have failed - for instance, if the clutch isn't engaging, preventing refrigerant circulation. Sometimes it's a blockage in the lines, with the expansion valve or dryer clogged, stopping the flow. I recommend first testing the refrigerant level and trying a recharge; if that doesn't work, check electrical components like relays or fuses. Long-term neglect will waste fuel money, make the car unbearably hot, and affect driving comfort. In most cases, spending a couple hundred to replace seals will solve it - the key is not to delay, as driving uncomfortably in summer can easily lead to distracted driving accidents.
