If you’re not convinced, look at the power usage of electric appliances like microwaves, space heaters, water heaters, ovens, or coffee pots. No air flow from AC/heater vents even though fan is running. I set it on full heat, then set the mode to face and floor vents but leave the fan off. 2 Answers. Check the air filter. I have a service contract and … It keeps the truck a perfect temperature for me. Now I have cool air coming through the vents as I drive. the air conditioner vents on my car are blowing out hot air even when its off why? Which means the problem probably lies with your heater fan. Submitted: 9 years ago. In the end, I figured out it the hum was coming from the wall where there was a vent register, and it was putting out heat even though the HVAC wasn't on. Whenever Im driving heat comes through the vent and it also heats up my dash to the point where its hot to the touch. … The difference can be seen be… Heat won't turn off: Troubleshooting & repair when there is too much heat or when the heat won't turn off, This article explains where and how to turn off the heat if simply turning down the thermostat does not stop un-wanted heat coming from heating radiators or baseboards. However, when the fan switch is turned off, very warm or hot air continues to blow through all vents even when the heater switch is turned completely off. I expected that turning the system off would mean there would be no heat or AC produced. 4 Answers. There appears to be no leaks and there is nothing wet under the van and according to the coolant bottle, its never down on coolant. I started to have waves of heat out of the dashboard vents even when the heater is off, I just closed the vents however the heat is so strong that still some heat comes out, do you have any idea of what is wrong or what could be the cause? Same thing happens at home when your furnace comes on the first time. If I turn the fan switch on and then set the heat temperature to a warmer or hotter setting, I get warm or hot air as desired. If there is steam coming out then it looks like the heater core is leaking. Some workers were here today, putting in new doors and insulation in the attic. If you feel even a tiny trickle of warmth coming through the vents, then you know that your heater core is likely receiving hot coolant. The fan is the only thing that can actually move air so if you are still getting air flow through the vents I would suggest it is one of the following. / my climax controls are off but heat is coming from the vents. Then the radiators will be hot even though the heat is turned off. Your supply vents may be blocked or shut off. i am going to try my best to explain this problem. Unfortunately this means you most likely have a heater core leak even though you can see it or find coolant. When a diverter fails or gets blocked with debris, hot water intended for the hot water circuit can get into the radiator circuit. You can do this by turning your fan to the ON setting and seeing if the system kicks on. For a 2100 Sq Ft home, closing up one or two vents probably won't have a great effect, but closing off four or more probably will. Have read many threads here but none seem to describe my problem. You do not have to live with constantly hot radiators. ... heat is coming from vents when heater is turn off 1 Answer. Your system needs to flow through your house instead of being blocked off. I eventually took the vent off to discover it wasn't part of the AC at all. Fan motor spins down after you cut the power off. Simply wait until you are driving at a good speed—say, 40 mph or faster—and switch the controls to heat. My heater is running, but no heat is coming out, just cold air. It is not igniting, the the fan will not turn off, even when you turn the thermostat off.   When they left, it was 89 degrees inside. As a result, any air that blows out of the vents while your heater is off will usually feel cold. Heat comes out of the vents even when the heater is off and also when I have - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. My drive is about 15 minutes and I never had any hot air blowing, when selected hot of cold it felt like the ambient out side air. Maybe your heater is not blowing hot air even though the fan is running. Turned the AC on/off, hot air was coming through the vent. Honeywell - thermostat/heater still on heat even though it's off as the topic say, it's off, but i can still feel heat coming from the vents it's not digital, it's a nob for the temp, 2 switches (heat/off/cold, fan:high/med/low) 2006 Chrysler 300-Maintenance & Repair. how is this possible if i have it all the way off. If you set the temp dial to a colder temp, it will still blow though the vents, but the air won't be going through the heater core so it won't be hot. Engine runs rough when system is activated. ... burning, and the smell continues over a long period of time, it may be that the motor in your furnace is burning out. Or maybe the air starts off hot, then turns cool before the furnace shuts down. I have a 1992 Jeep cherokee limited ant the ac/heat is coming only from the defrost vents. Another smell coming from your heater could be that of burning plastic or rubber. 2. I actually love it in the winter time for highway driving. The hose going to the back heater core gets hot but it cool coming out but again no leaks, and no pressure, any ideas? Whenever the furnace goes on, I smell a strange sweetish odor coming from the vents which irritates my eyes and nose. When I turn on the “real” hot air, the this unique hot air stops. when i am driving i can feel hot air coming out of my vents when the heater is off. So if your heater is emanating an electrical burning smell, turn it off immediately and call us at 813-609-5015 for help! 1. but its summer and i don't need the extra heat. If there is no air coming out of your vents, make sure that your furnace is getting energy. Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). I just dealt with this problem, and it kept me awake until the wee hours of the morning. Even though your furnace is meant to get hot, ... quickly turn off your heater and try to find where the smell is coming from. Let’s look at some of the solutions to this common furnace problem. Even if there is an HVAC system that both heats and cools the home, ... it will cut off the burners that heat the home and cause it to pump out cold air. my heater/ac is off but if i put my hand next to the vents i can feel air coming out. I have 3 returns and a lot of supply vents and covering each one individually would be time consuming and not practical.   I turned the air back on, but noticed after a while that … Pleanty heat to the front dashboard heater, but bearly any to the rear, it does get lukewarm. The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. If this continues get your car to a mechanic ASAP to check for an exhaust leak which can be dangerous. I believe this vent is meant to be for the heater to suck air out of the room while at the same time push hot air from the vents on the ceiling. Your furnace clicks on and the blower motor is running, but the air coming from the vents is cold or cool instead of hot. I went up into the ceiling. Your radiator service person will perform a drain-down and replace the faulty component. Fan motor is getting some low level power either through a bad switch or a short. 1. Burning Plastic or Rubber Smell. The loss due to inefficient heat exchange per unit of fuel will actually outrace heat loss from unheated rooms if the furnace is not operating in its nominal air flow range. Cheap and Easy Solar Heater: Converting electricity into heat is one of the most expensive uses of energy. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. Had me pretty concerned. I had the same problem with cold drafts coming thru the ac vents that are not used for heating in the winter (I too have baseboard hot water heating and only use the ac and ducting in the summer). This is easy. Is That Smell Coming From My Heater? I have owned a 2006 Mustang GT for about 10 months now and I’ve noticed that “hot” air comes from the dashboard vents as well as the feet area even when the control are in the “O” off mode. If this is the first time you turned the heat on for several months it may be dust baking off the heater core, if should clear up soon. The hose from the heater that is going down the vent is pushing out cold air. On my way home today I turned the climate control on, changed the temp from 68 to LOW and then turned it off. If you turn on the heating system and notice that cold air is coming out through the vents, ... which is typically every three months unless the heater isn’t being frequently used. if i turn it on normal it seems to work perfect. Make sure that no furniture or household items are covering the vents. :wrench: Thanks in advance to anyone with an answer. Go to each room and open all the vents, even in the rooms you don’t use. Any other color could be a sign that there is something wrong with your heat source, in which case you need to bring in a professional to troubleshoot your problems. A Fix to Cold Air Coming Out of Vents: Duct Insulation & Sealing Services Ducts should be tightly sealed and insulated to keep the air in them warm during the winter. Keep your doors open throughout the house. It comes through even if i have everyoff and in … its not blasting out like if it was on but you can feel warm/hot air coming through.the heat worked fine in the winter and the vents open and close properly. I had to use my emergency switch on the wall to turn off the furnace. i put the dial at 60 degrees to see if … Whats wrong? Usually this means a foreign object such as a toy has found its way into your heating system. Need some problem solving help in understanding what is going on with ’84 El Camino. Heat comes through the vent when the heater or a/c is not on. I guess even with the system off the valve allowing coolant to the heater core remains open. I left work this am and usually within 5 minutes of the engine running I have heat coming from the vents when selected on controls. Turn the blower motor OFF (when the heat exchanger drops in temperature after a heating cycle) Turn the furnace blowers off (when the heat exchanger hits dangerously high temperatures) That said, if your furnace fan limit switch is damaged or has been tampered with, it might allow the fan to run even after the heat exchanger has cooled off. They turned off the air with my programmable thermostat (that I don't have programmed -- I have no need for that feature) because they had the doorways opened up for quite a while. It was 89 degrees inside coming only from the vents which can be dangerous have to with! 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