Why is my AC system freezing up? There are manyitems that can cause your HVAC system to freeze up; many of them usually need to be corrected by a professional technician. Determining the air filter is clean or replaced and confirming the airflow is not restricted are about the only tasks a homeowner should safely identify or handle themself. Low refrigerant: Sometimes, freezing up originates with a leak in the refrigerant lines. Weak solder joints, friction from piping rubbing or vibrating against an object, leaking valves or loose fittings can cause leaks. The length of time your system has been installed and the type and location of the leak are the determining factors on whether to have the system repaired or replaced. Dirty evaporator coil: In time, the evaporator coil will become dirty. In these cases, the results are similar to those of having a dirty filter. Gradually you will lose airflow, slowly enough that you probably would not realize it until it freezes up or is not cooling adequately. You will need to contact your local Service Experts sales and service center to correct the problem. Defective blower motor or relay: A blower motor operating at the wrong speed or not running at all can cause freezing. It can also be sporadic, starting at full speed and slowing down after it heats up. Or a relay could cause it to start one time and not the next. Either way, you will need to contact your local Service Experts sales and service center to correct the problem. Should you find that your system was freezing due to a dirty air filter, after replacing or cleaning the filter, you can hasten the thawing process by turning the system off and then turning on only the fan. If you have a heat pump system, you can try turning the system to heating mode until the ice has melted. After the ice has melted, turn the system settings back to normal. If the system refreezes, contact Levy & Son in Dallas to fix the problem.