Check your air filter. its a 2010 altima nissan. We serve as Reddit's central hub for vehicle-related discussion including industry news, reviews, projects, videos, DIY guides, advice, stories, and more. It's only minimal amount of warm air. Contact ABC to have a service specialist come out and make sure your AC unit is healthy enough to keep you cool. However the heat registers were closed, if too many are shut, it can cause heat to build up in your furnace, causing it to shut down automatically. I know for the celica, the reason is that the dial that turns the motor on and off does not close the air duct. When the furnace is on, obviously the hot air is being pushed out any possible openings. Thus when I turn the HVAC off, all air movement stops. Your furnace will have a label on it with directions on how to relight your pilot light if this is the culprit for your problem. Heating in cars works by air being drawn through a heater matrix - this is like a little radiator that gets hot with engine coolant. When high-efficiency furnaces run, they create water which is then drained through a condensate line. In your case, you can set the temperature of the air that dribbles out by turning it on, setting the temp, and turning it off again. 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. However you say its hot air when the fan is off? ... heat is coming from vents when heater is turn off 1 Answer. The leakier your home, the more opportunities the heat has to escape. its a 2010 altima nissan Fan speed works as it should but - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. For the second year in a row we have had a terrible smell coming out of our vents. why does this happen ? Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. Common blockages include dust, dirt, mold and, if there was recently a cold snap, ice. this wouldnt be carbon monoxide by any chance would it ? That is a big difference. If the line gets blocked, water will back up into the furnace which will result in the overfill kill switch getting tripped. Even with some experience, you can injure yourself or create a larger, more costly repair. i am going to try my best to explain this problem. i drove my family car few times and i felt heat coming out of the vents, the heater is off though. You can hear the furnace running, and you can even feel air coming out of the registers. 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. Why does heat constantly come out of my vents even when heater is off. This. Otherwise get the unit checked. Or, if you don't like the fact that air is kinda coming out while driving, you can turn the recirculator button on, THEN turn the system off. Thankfully, this is an easy fix. Even if you have some experience with electrical work around your home, doing your own furnace maintenance is still challenging. If the switch is not working how it should, it may not tell the fan when it should stop blowing air. Section 2 – If Your Furnace Won’t Turn Off After Your Set Temperature Has Been Reached. If you have a high-efficiency furnace with water pooling around it, you could have a condensate blockage, which will cause the furnace to shut down. The limit switch is responsible for telling your furnace’s fan when to start and stop blowing air. Whether you’re in urgent need of furnace repair, or you’re ready to replace your furnace, the licensed heating and cooling specialists at ABC can help. 2006 Chrysler 300-Maintenance & Repair. I have a 96 celica that does this as well. Most furnaces will last anywhere from fifteen to thirty years. Essentially what happens is the motor isn't spinning the fan, but the air rushing past it is. If your ducts aren’t properly sealed, cold Ohio air could be creeping in from outside and cooling down your home while making your furnace work harder than ever. Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). I had a car that did this. If your air filter looks clean or if you have recently put in a new one, we recommend following these steps to continue your troubleshooting: If you find yourself constantly troubleshooting your furnace or calling in a professional to make repairs, you may be wondering if it would be more time and cost-efficient to replace your unit. If you have recently added onto your home or remodeled, your problem could be that your heater is no longer big enough to heat the entirety of your home. If anything like the heater (no AC) in my 92, the coolant runs through the heater core all the time and driving forces air through vents, even with blower fan off. I'll explain what happens when you have mechanical controls so it makes sense (like my '97 Sentra), and then what you probably have to do for your newer Altima. As the heat heads upward, temperatures in the home stratify. If your furnace is over fifteen years old and you are deciding whether it would be more cost-effective to replace or repair your unit, there are two cost factors to consider. Our professionals are highly trained and are able to work on every make and model of furnace. When the HVAC is off, the outside air pushes its way through the vents, that's also why sometimes you will notice on the lower speeds, that the air moves quicker when you are driving 70 mph vs stopped. I guess even with the system off the valve allowing coolant to the heater core remains open. They came yesterday and checked the freon in … This only happens when the unit is completely off during the cool fall/spring months (same months last year, sept/oct/nov.) This unpleasant surprise is common, unfortunately, and can make uncomfortably cold weather that much more difficult to handle. i drove my family car few times and i felt heat coming out of the vents, the heater is off though. A lack of heat can be a symptom of a much larger problem. It's a common problem with the car I have but I juts pop the old ones out and put some new ones in. / my climax controls are off but heat is coming from the vents. Turning it to recirculate is a fix, as it will keep the outside air out for the most part. As you drive along, you are building up pressure in the intake plenum of the HVAC system. My thermostat display is orange and says it's heating to the set temperature, but furnace isn't kicking on. Verify that the vent unit is fine by engaging "recycle air" mode and see if the heat is still coming out. It’s a situation we hear happening to several homeowners. When you come home on a chilly day, the last thing you want is to be met with is a gust of cold air blowing out of your vents when the heat is on. The house is cold. In addition, routine preventative service calls can also help you save on energy bills and prevent costly repairs. Before doing any sort of maintenance on your heating system, make sure that you turn your unit off to help prevent injuries and costly repairs. heat coming from vents even though heater is off ? Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. While I'm driving I can feel the heat coming through the vents, I check to make sure everything is off, it is. If the temp control is set to warm and you are in motion then hot air is going to make its way through regardless of the heater fan being on. When the house reaches the desired temperature, or the heat is turned off, the pump stops running. The test is whether the air temperature is warm regardless of where the temperature knob is set. Hot air comes from the vents when the AC is off due to ducting “gains” (heat we are talking about). A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. 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. Your Pilot Light Is Out Do you want to make sure your AC unit doesn't go out in the dog-days of summer? If the heating system won't turn OFF, that is if heat keeps being delivered even when you don't want it, set the thermostat to its lowest temperature setting and wait three to five minutes. When this happens, your furnace will continue to blow air throughout your home, even when that air is not heated. Let’s review a few common scenarios and discuss the best ways to keep your heating system functioning properly. Its coming out with the consistancy of the heater when its on medium. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. There could even be a puddle of liquid under the front of the vehicle. If it's warmer inside your home than it is outdoors, heat produced by your furnace will find a way to escape your living space. If you are constantly relighting your pilot light, your system may have other problems. heat coming from vents even though heater is off ? So once the heat comes on, the dust burns off and the odor passes through your air vents. why does this … The hose going to the back heater core gets hot but it cool coming out but again no leaks, and no pressure, any ideas? A simple valve in the cooling system fixed it. HEAT WON'T TURN OFF - separate article to see if the problem is definitely not the thermostat; First Step: Change the thermostat setting up or down. Usually this means a foreign object such as a toy has found its way into your heating system. /r/Cars is the largest automotive enthusiast community on the Internet. Turn the circuit breaker off and on to reset an electric furnace. Another cause of a malfunctioning condensate line is a broken condensate pump. On my way home today I turned the climate control on, changed the temp from 68 to LOW and then turned it off. 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. Having an on and off issue over the last 3 weeks. Air carries heat. Or is your heater an electric heat pump? New comments cannot be posted and votes cannot be cast. It's not a flaw, it's just that air is being forced in, and I can actually control the temperature of this dribble air by turning the knob from hot to cold as desired - it's great on the highway when I need a slight amount of fresh air and I don't want to freeze. Another smell coming from your heater could be that of burning plastic or rubber. Part of the box will still get hot but not as bad as having the air go through the core. once it starts theres no stoping it with out turning the car off. Another issue you could be confronted with is large holes or leaks in your air ducts that allow cold air from your attic to get through. This is normal for heat … All I have to do to stop that is go from fresh air, ducts open, to recirculating cabin air, ducts closed. 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. 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) Clarify what fan. Nov 19 2012, 6:24pm. I have a Goodman GSC130361, 3 ton ac unit. Well, it’s not COLD cold, it’s just room temperature. Have you noticed that your bill has skyrocketed? If you can’t locate the source of the problem or need professional assistance to repair your central heat, call us and we’ll send an experienced technician out to your home to identify and fix the problem right away. A certified heating technician will be able to diagnose your problem. The general rule about heat is that it moves to wherever it isn't. when i am driving i can feel hot air coming out of my vents when the heater is off. The heater isnt stuck becase it doesnt happen right when i start the car. If there is an inadequate amount of gas making its way to your furnace, for example, it won’t have the energy required to heat up. We have been in our house for 5 years. Flame sensors get dirty more quickly if your air filters are also dirty. So, when the switch is working correctly, your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends. When the furnace is off, air (wind) is allowed to blow back into the house via this ducting. The fix: Nothing. Inconsistent temperatures coming from your vents signal that your ductwork is likely to blame. Perhaps your temperature gauge is running below normal. i drove my family car few times and i felt heat coming out of the vents, the heater is off though. ), then take an infrared thermometer and shoot the chase to see if/where there are … Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. If it is set to ON, your fan will constantly blow out air, even when your furnace isn’t heating it. 2 Answers. It's not something just as simple as the knobs/dials broken. Pleanty heat to the front dashboard heater, but bearly any to the rear, it does get lukewarm. A sticking valve may mean that that the air is constantly taking the "hot" path through the matrix rather than the cold path. if it blows cold when set to cold I wouldn't worry. To keep natural convection from allowing hot water to circulate to the radiators when the pump is off on, there is a check valve. is this normal ? No leaks and violent is good. Verify that the vent unit is fine by engaging "recycle air" mode and see if the heat is still coming out. And the more heat that escapes, the less warm and cozy you'll be. If this does not cause the heat to come on, the heating element might need replacement, which requires the services of … If you smell something foul coming from your heater vents, diagnose the problem. Press J to jump to the feed. Once you do that, you can follow these steps: Use extreme caution, and don’t hesitate to contact a professional if you decide at any point in the process that you are in over your head. Check to see if your thermostat is set to ON or AUTO. If it bothers you, just move the cold/hot dial to middle or cold. There are a few other problems you may run into, which, in addition to some of the issues mentioned already, will require the help of a professional. There is heat coming out of the vents in my car even though the heat isnt on? Last year we had our vents cleaned and checked for critters. The leakier your home, the more opportunities the heat has to escape. The heating system is sealed. If this vent unit is faulty, it can cause hot air from the engine compartment to find its way into the cabin through this vent, causing this heat to come through the dashboard vents by help of the blower suction. When you come home on a chilly day, the last thing you want is to be met with is a gust of cold air blowing out of your vents when the heat is on. but its summer and i don't need the extra heat. Do you hear a high-pitched, tuning-fork type of sound coming from your return air vent, the metal grille that pulls air into your heating and cooling system? Clogged air filters could be causing cold air to blow out of your vents. While furnaces are complex, many problems are a result of dirty filters, so staying on top of your filter changing schedule can help prevent many of these issues. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. The AC compressor fan on the unit outside the house or the blower fan (main house circulation fan for AC or heat, the fan that blows air out the vents) and usually part of the furnace? There is Hot air coming inside my car from the vents, Even though everything is off and the air temperature is set on blue (Cold). Haven't did - Answered by a verified Ford Mechanic Some modern cars close the recirculation door when the HVAC is set to off to prevent this, but not all systems do. Set the temp to coldest position to close off the air blowing through the heater core. Closed heat registers can cause other issues, as well. And you wait — and wait — but the heater just blows cold air. If they are even slightly open, or not well sealed, warm air will pass into the passenger compartment, even if you have your heater control set on Cold and the fan on Off. If the air remains hot when set to cold, the problem is a stuck blend door actuator. So if your heater is emanating an electrical burning smell, turn it off immediately and call us at 813-609-5015 for help! No heat coming through the vents I say its the heater controls on the dash...the coolant and cooling system are fine...the a/c needs a recharge... Posted by mark torres on Oct 22, 2017 My car heater keeps blowing very hot air even when the inside thermostat is turned off. Thankfully, there are a few common causes of this issue that can help you identify a solution. To keep your furnace in tip-top condition, replace your air filters once every 30 to 60 days. If this vent unit is faulty, it can cause hot air from the engine compartment to find its way into the cabin through this vent, causing this heat to come through the dashboard vents by help of the blower suction. When you turn on your central heating system in your house, you expect a warm blast of air to enter through the vents and bring your home to a comfortable temperature. Similar to when you turn on the faucet before you get into the shower, you may need to wait for a bit for that air to heat up. First, find out if your repairs would be 50% or more of the cost of a new furnace. Otherwise get the unit checked. 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. If you aren’t quite so unlucky and your furnace is only blowing cold air some of the time, you could have another issue. why does this happen ? But it’s not hot air coming out, it’s cold! This unpleasant surprise is common, unfortunately, and can make uncomfortably cold weather that much more difficult to handle. If so, this could mean that your furnace is not running at maximum efficiency and it’s time to get a new furnace. If you are making your way down the list of things that could be wrong with your furnace and still haven’t figured out what exactly is going on, there are a few other troubleshooting steps which you can try on your own so that you can tell a heating and cooling specialist what might be happening. 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