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The coil in your air handler or furnace gets extremely cold when your system is in Cool mode. Plus, it condenses moisture out of the air to dehumidify your home. A super-cold coil + condensation = frost. The buildup will prevent it from gathering heat and produce a heat pump blowing hot air instead. Some heat pumps can defrost the indoor coil.


A/C doesn't blow cold air. Heater blows hot air constantly when car is on or when engine is running will not stop even when A/C is on. A/C shop Evacuated r12 from A/C system changed fittings and recharged with r134. Cold air for a few days then it stopped.


My heater doesn't blow hot air unless I am driving at a steady speed (25 or greater). As as I'm moving along, it blows - Answered by a verified Dodge Mechanic


My heater does not always blow hot air 50% of the time. Usually when it kicks in there is a swoosh sound but sometimes this does not happen. The blower works but just cool ait comes out.


Why is my air condition or heat pump blowing hot air? Posted on June 27, 2016 by David Boer. What might be causing your AC to blow warm air? We are thinking you are the type of person who looks for good news first. The good news is part of the system is working or it would be blowing air at all. Specifically the indoor part of the unit is working.


This video is showing you how to get your heater in your car to blow out hot air. . Please Subscribe To My Channel For More Great Content: https://www.youtub...


Reasons for car heater to not blow hot air? September 24, 2009 12:02 PM Subscribe. ... As the coolant heats up, the spring opens and allows the hot coolant into the heat exchanger, which is where the cabin heat comes from. If the spring doesn't open, you get no heat. It's a relatively cheap fix.


Why would my heater blow out cool air when sitting still and then hot air when going down the road and then it's not all that hot Try flushing or blowing high pressure air through the heater core lines. its sludge build up and need to be flushed through heater core only. check antifreeze fluid level. only put in straight antifreeze, do not mix.


Heater doesn't blow hot air. The other night in my 2003 Dodge Intrepid the heater was working fine and then a few minutes later it just quit blowing hot air. It now will only blow cold air. ... It is over heating and the heater does not blow hot air in the moring after the car is warmed up.


Hot Surface Ignitors. A hot surface ignitor works much like the filament in a light bulb. It has two electrical wires that, when energized, heat the ignitor’s surface to the point that it glows orange. Your furnace then shoots natural gas close to the ignitor, igniting the gas which warms the air that your furnace’s fan blows through your ...