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The most common cause of a heater blowing cold air is a bad thermostat. The thermostat opens and closes to regulate coolant flow.Why is my heating system blowing cold air?
In some cases, your furnace could be blowing cold air because it is overheating. If your furnace blows hot air, then cold air, and then stops blowing any air, this could be a possible sign that your furnace has overheated.Why is my central heat blowing cool air?
Quick Answer. There are several reason why a central heater might blow cold instead of warm air and these include a blown out pilot light, an overheated furnace or its thermostat is set to "On.". These three issues are the most common causes of why a central heater will blow cold air and the ways to fix these issues are relatively simple.