Your AC unit would probably blow heated air if the expansion valve was broken. An expansion valve lets the coolant to expand into its normal low-pressure vapor state from a liquid.
Symptoms of a bad refrigerant expansion valve
AC takes a long time trying to cool the indoors
AC air production is definitely not as cold as it used to be comes through the ducts
Before you decide on buying or ordering do your best and cross-check the correct model and also make a visual comparison in order to be sure the proper replacement expansion valve is the one being purchased. It can be quite simple to replace a expansion valve on your Soleus Air PE3-12R-03 as long as you have previous experience and have the proper tools to do the job.