What is the reason for the car air conditioning pipe freezing but the air blowing out not being cool?
3 Answers
Car air conditioning refers to the air conditioning device installed in the car, which can cool, heat, ventilate, and purify the air inside the cabin. The reasons for the car air conditioning pipe freezing but the air blowing out not being cool are as follows: 1. Thermostat failure: This causes the expansion valve to be unable to control the flow of refrigerant based on the temperature of the evaporator box. As a result, excessive refrigerant throttling occurs, and the excessively low-temperature refrigerant cannot immediately absorb heat and evaporate, leading to the formation of ice on the car's cold air pipe. 2. Excessive refrigerant: Too much refrigerant in the system causes excessive pressure, keeping the expansion valve open too wide. This results in excessive refrigerant flow, causing the low-pressure pipe to freeze. 3. Expansion valve malfunction: The expansion valve senses the excessively low temperature of the low-pressure pipe and reduces its opening.
As someone who frequently tinkers with cars, I can relate to seeing the AC pipes freeze but the air blowing out isn't cold. This is usually due to a faulty expansion valve that fails to properly regulate refrigerant flow, causing the pipes to overcool and freeze. If the fan is spinning too slowly or not at all, it can't effectively circulate the cold air. Another common culprit is a severely clogged air filter restricting airflow, resulting in warm air output. I remember last time my car had this issue, inspection revealed an aging fan motor couldn't maintain proper RPM - replacing it solved the problem. I recommend promptly checking the fan system and filters. Procrastination may damage the compressor, leading to costlier and more complicated repairs.
As an experienced driver who has driven several cars, I've encountered issues where the air conditioning pipes freeze but the car interior doesn't cool down. The cause is often low refrigerant levels - the evaporator gets too cold and forms ice, but insufficient pressure prevents cold air from circulating. Additionally, if the temperature control switch fails, the fan won't start and air can't blow past the frozen area. I recommend first trying to turn the fan to maximum speed to check if it operates. If there's no sound, immediately inspect the switch or possible refrigerant leaks. Don't underestimate these problems - driving with a malfunctioning AC system can be distracting and particularly dangerous in hot weather.
