Why does my heater keep blowing cold air?
Why does my heater keep blowing cold air? Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace's heat exchanger, causing it to overheat. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. Why is my Ford F350 heater not working? The job of your F350’s thermostat is to regulate the temperature of the engine. It does this by allowing water to enter the engine when it is getting hot, and by...