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Have started the heating system and it is blowing cold air constantly and will not reset. I cannot turn the heater off

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I am taking it that you are talking about a home furnace.

A home forced air furnace has safety switches in a few spots to prevent fires. When one of these safety switches trip from a problem, it will turn on the blower for the furnace but will not turn on the gas or ignite it for the heat.

The safety switches are pretty small, about the size of a penny. I would first try resetting the switch by pressing the button on it (if equipped with a reset), if there is no reset for it, replace it. Run the furnace, if it does it again...then you have a potential problem with the furnace itself and the switch is saving you from your house catching fire.

An easy way to find the switch is to look around the heat exchanger opening, there is usually one there to monitor flames that do not enter the exchanger. The heat exchanger is the part where the actual flames go into when ignited.

The safety switch will have a wire going to it.

Here is a picture of "a" switch, there are many types.
http://www.appliancedirectparts.com/image/HH11AZ180%20NEW.jpg

You can also Google the term "Furnace Safety Switch" and click no the link for "images" to get an idea of other types to look for.

If you are unsure of what you are doing, it is well worth it to have a licensed tech come out to take a look at it. If you have a cracked heat exchanger (can not see with naked eye unless unit is disassembled), it can let deadly gases get into the airflow and cause a variety of health problems...including death.

Hope this helps you out and good luck with fixing it.

Posted on May 03, 2010

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Having trouble with the heater in my 2006 Dodge Grand Caravan. When the car is driving around the neighborhood or stopped at an intersection, only cold air blows. Only with extended constant acceleration,...


Yes . Your heater is actually not an Electrical Heater or a Separate Heating system . Actually if uses the same Radiator Line . When Radiator is heated up it is cooled down with radiator Fan and coolant . But when you use the heater function , this hot fluid is passed through a heating coil tube and blower fan is used to take that heat inside the car .
So I think now you understand , why you are not heated up in a short run . You really need to make the Engine + Radiator Warmer ( that is natuarlly happened when you run more) to get Warm air inside.
Please rate my answer fairly and Support me With Regards and Season's Greetings Deepak Richard

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The heater will not blow warm air until you start driving. The fan blows but its cold air. Once you start driving the air turns warm. Why?


There may not be enough coolant in the system. What happends is the heating core is nothing more than a small radiator inside the car. If the fluid is low the heating core is empty. But once you start driving the water pump works harder and fills it up. Another possible cause is a sticking thermostat. If its stuck open the engine cant retain water to heat it up. Thus blowing cold air. Whith the engine cold remove the radiator cap and check your coolant level. If it is full a replacement thermostat may be needed. HTH and dont forget to rate.

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An indoor blower running when it is not supposed to usually indicates an overheat condition. I would guess that it has been cycling on and off for some time and finally caused the high limit to stick and not auto reset. if you tap it sometimes they reset. the real problem is that it has been overheating from lack of airflow, over sized unit, not enough return air, too many closed registers, dirty filter, dirty squirrel cage blower and or air conditioner a-coil. If you get it started again sit and watch the unit run the flames should come on and stay on for the entire heating cycle, not going on and off.
I wish I could help you more but it is difficult without seeing the problem myself. Good luck! this should get you started!

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