Heater Blowing Cold Air

Air from the blower is not blow toward the heater core or the coolant does not flow through the heater core.

Heater blowing cold air. Run the engine until the fan kicks in. 2 clogged air filter. This is usually a simple fix but you ll need to call a technician to adjust or replace it. Just like in the summer the system requires the proper level of refrigerant.

Since the heater core is often the high point in a cooling system air can move into it and become trapped. Again using occam s razor we can assume that. For a heat pump or heater to produce warm air air must flow easily through the filter. A furnace blowing cold air could be due to your thermostat.

There could be various reasons for car heater not working but it basically happens for two reasons. The thermocouple is a sensor that controls the gas valve and ignition. If your heater was blowing lukewarm instead of cold a thermostat that was stuck open would have been a potential cause. 7 reasons your heater blows cold air ac blows hot air 1 dead batteries in thermostat.

Once your fan has come on look around the radiator for a bleed port or bleed screw. 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. I have found that occam s razor works more. Furnace troubleshooting from asm.

Due to their design heat pumps blow colder air than gas and electric furnaces. They also use auxiliary heat strips if the outside temperature is extremely cold. During the winter when you crank up your heat the coolant is brought over from the engine to the heater core that then blows warm air into your car. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat.

If you do manage to relight the pilot but it keeps going out a faulty thermocouple is likely causing your furnace to blow cold air. It can feel cool for the first few minutes because the engine has to warm up in order for the coolant to heat up and provide heat to your interior. Is your heater blowing cold air right after you turn it on. Another common problem is when air gets into the cooling system.

A c ar heater blowing cold air could be a symptom of the failure of the heating unit. If your system has a bleed port or bleed screw and you can find it you can fix this air lock yourself. Seems silly but you d be surprised how often this has happened.