Air Conditioner Expansion Valve Freezing

The a c expansion valve is found within the air conditioning system of a vehicle.

Air conditioner expansion valve freezing.

When the expansion valve fails or has any issues it can cause problems with the functionality and performance of the ac system. Notice the frost at the expansion valve s port above where the refrigerant is metered into the evaporator core. This is because now there is less freon in your system but it is still being forced to expand the same amount more expansion equals a cooler temperature. If moisture enters the air conditioning system it freezes at the system s metering device.

This is due to lower pressure inside the system itself. Whenever there is an abundance of refrigerant the core of the evaporator will get too cold and eventually freeze. Expansion valves on medium temp systems normally do not have any frost or ice accumulation. The expansion valve meters refrigerant flow according to evaporator temperature and the load and cooling demand of the ac system.

The purpose of the valve is to manage how much refrigerant liquid can flow throughout this system. Txv thermostatic expansion valve air conditioning systems contain a receiver drier that cleans and absorbs moisture from the refrigerant.