Why does the Jetta's air conditioning pipe freeze?

[DelDamian]

Jetta air conditioning pipe freezing reasons are as follows: Abnormal expansion valve: The expansion valve for the low-pressure pipe freezing should be abnormal. When the expansion valve senses the low temperature inside the low-pressure pipe, it will reduce the opening of the expansion valve, so that the low-pressure pipe will not freeze. Excessive refrigerant in the system: Too much refrigerant added to the system causes excessive pressure, leading to the expansion valve remaining wide open. Excessive refrigerant flow results in the low-pressure pipe freezing. It is normal for the low-pressure pipe to collect water, but a frozen air conditioning system should stop operating if the thermistor is functioning properly. Therefore, a faulty thermistor is also a possible cause.