The answer to 'why is my air conditioner freezing up' is that a frozen coil is a common issue with air conditioners. This happens when the coil that absorbs heat from the air gets too cold, causing moisture in the air to freeze on the coil. This can restrict airflow and prevent the AC from cooling effectively.
Some common causes of a frozen AC coil include low refrigerant levels, a dirty air filter, or a problem with the blower fan. If the refrigerant level is low, it can cause the coil to get too cold. A dirty air filter restricts airflow, which also leads to freezing. And if the blower fan isn't working properly, it won't circulate air over the coil, causing it to freeze up.