To protect the heater from malfunctioning altogether, engineers embed automatic limit switches that are responsible for turning the heat-generating furnace off. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting dial but there is still no air at all to feet and defrost. It blows cold air for the first 10 minutes of each heating cycle. No heat to feet or defrost. When we start our van the vents blow consistent cold air when the adjustment is for heat no matter how long we "warm it up". Lately, cold air comes out from our vents, which are on the floor. It’s normal – If you’re only getting a bit of cold air when your furnace first kicks on, but the air is nice and warm after a few minutes, it’s likely fine. One common HVAC mishap is when your heater turns on, but the air coming out of the vents is still cold, so what should you do about that? Several issues could be going on with your home’s heat. Re: Air Through Vents even while ac/heat off Nov 19 2012, 6:24pm 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. Let’s look at some common issues that would cause your furnace to blow cold air. As soon as I stop at a red light, or am idling for any length of time the air coming out of the vents begins to lose temperature until it blows cool air. Our Lennox system is doing the same thing now for several months. My thermostat is off, but there is air blowing from my vents. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Quickly shut thermostat off and then on again and problem was solved. The A/C is blowing cold air and is working fine. Home inspection noted no problems with AC unit. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. Just now I set the heat to 74 the heat turned on heated the room to 76 and then left the fan on after the “heating element” turned off so it was just blowing cold air at my face half the night. We have 4 zones but normally leave one zone off. Last week, at one point, I turned AC on and cold air was blowing out of return instead of sucking and no air was coming out of supply's. Sometimes we can rev the engine up which will, for some reason, get the heat coming out, but usually it takes driving it for a while before any heat will come out. Reasons Your Furnace is Blowing Cold Air. Furnace Basics. When my heat is on warm/hot air is coming out of the passenger vents - as it should; but the air coming out of the vents on the drivers side is cold. Then heat starts to appear fine. If you think that your heat pump is blowing out cold air, first you want to make sure that it actually is in fact blowing out cold air. Drivers changed air temperature far more often than they change the mode (defrost, floor heat, dash vents, etc. ), so the temperature actuators generally fail first. We build a house 1 year ago and when the temperature gets below 50 degrees outside we start getting cold air coming through 4 vents of our house. All I have to do to get hot air again is give it a little gas, say 200 more rpms, and the heater immediately responds with warmer air, hot air if I maintain 1000 rpms. This is when the furnace is NOT running. Heat pumps usually produce air that is 85-92°F. This is plenty warm to heat your home to your desired 72°F. The Chevy Silverado climate control system uses several different components that come together to either cool down or heat up the cabin. Car issues can make people scratch their heads. 11. I noticed today that only 1 of the thermostats showed cool ON … My thermostat is off, but there is air blowing from my vents. Again this is when the heat is on. The cold air return lets in cold air when the furnace is off. Heater working but only blows out front vents. Unreliable car heaters can make the cold winter months practically unbearable. Cost for electric nowadays is out of this world. Meanwhile, the outside air is redirected back into the outside environment as a blast of icy cold air. Why a Heat Pump Will Blow Cold Air. Hello, My furnace blows code air from vents when heat is off. Change the air filter. Items in red usually require a service call. The "blowing cold airs" periods eventually get shorter and shorter... as the "blowing hot air" periods get longer... and eventually, after 3-4 hours, the home is at the desired temperature. I set desired temp to 70. It blows cold air when the heat is on. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. JustinRandy131. ... because it gets automatically deducted. That prevents your heat pump from blowing cold air out of the vents. This post will explain what causes cold air to come out of the vents when you have your heater on, when warm air should be coming out … But as it turns out, this is a furnace problem that comes up often in many Bay Area I changed two conditions. 3,770. 2 of the returns blows cold air out of the return vents but not out of the supply registers. What is this and how can I stop this from occuring? I really hate the propane, but it is what it is. Why is cold draft air coming out of the vents? When room temp falls below 70, heat kicks off and blows hot air through vents and everything is as expected but when temp reaches above 70, it starts blowing cold air even when settings are set to "Heat" and FAN it set to "Auto". As nuts as it may sound, the air in your home can feel chilly even though the heat pump may be working completely fine. A dirty air filter restricts airflow into your furnace. The colder the outside temperature gets the more air we have dropping from the vents. Furnaces are one of … Nest Thermostat Generation 3 2 years ago. Check that the fan blower switch is … This issue could be caused by an improper thermostat setting. 5 Reasons Cold Air Comes Out of Your Vents When You Turn On the Heat If your car heater is suddenly blowing out cold air instead of heat in the middle of a bitterly cold winter, you have a good reason to be frustrated. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. My heat is blowing out cold air from the vents - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. William Reed on February 18, 2017: Hi my name is william and i have a 2005 dodge magnum. In other words, it's not putting out any heat at all. Just purchased a condo in AZ. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. In fact, when you stand in front of it, cold air rushes out of it as it it were connected directly to the outside of the house. It could even be running in the air conditioning mode due to a malfunction. The neat trick with heat pumps is that in summer, this process is easily reversed, allowing the same mechanism to instead transfer heat out of your home, cooling it in the process. My husband and I have a propane furnace. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? $85 for the last month when we haven't had heat or air on one single day seems high? Don't know brand or if it is a heatpump - think it may be since it is one unit supplying AC and heat. The same effect happens with your furnace. I picked up a whole housing subdivision of customers because the installation contractor did not hook this up properly. Well this could be caused by several things. Let us explain… The air could be warm but still feel cool. First, I opened the heat vent wider - This seemed to stop cold air return from blowing cold air when the furnace is off. First, shut your heater and fan to the off position on your thermostat, because if your vents are blowing hot air, continuing to run your heater will only continue the problem. It must push out the cold air from the vents before the warm air … I have a combination AC/furnace system in my home. Report Save. Compromised flame sensor. Been to Nissan twice. I don't know why. I have a 2010 Nissan Armada that is not blowing hot air when the heat is set on 90. level 2. If you’ve got cold air blowing out of your vents when the heat is on, check out this guide, and follow the steps to diagnose, and potentially fix the problem. The same vents that provide my AC in the summer also provide heating in the winter. Think of it like turning on a hot water tap. However, if you force the air out the vents only, using the 'mode' control, it will blow warm out those vents, if the system is working correctly. (Sometimes this happens for 30-60 minutes.) Your furnace is supposed to heat your home, so the last thing you’d expect is to feel cold air coming from your home’s air registers when your system is running. As a result, any air that blows out of the vents while your heater is off will usually feel cold. New heat pump owners often notice that the air coming out of the vents isn’t as warm as when they had a gas furnace. Some of the reasons your furnace might blow cold or feel like there isn’t as much warm air coming from the vents include: An improper thermostat setting. I fixed it for a homeowner in that subdivision, and they told their neighbors, and … The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. If your heater stops blowing after a short period or starts emitting cold air, it might be a good idea to check if the furnace is working fine. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. My car is 2011 Chevy Impala. All vents are on the opposite side of the house than the furnace. Below is a list of possible causes. 1. share. So if you feel the air blowing out of the vents while the furnace is off, the air will seem cool since it’ll be at about room temperature. Most often this air will feel cold when the fan is “on” but if you don’t notice a change in your overall home’s temperature most likely this is just blowing out room temperature air. So you will feel air blowing through your vents but the air is not heated or cooled by your furnace system. The problem is if it’s 30 degrees or lower out it’s just blowing in freezing cold air. Maybe your heater is not blowing hot air even though the fan is running. Chevrolet Silverado 1999-2006: Why Do My Vents Blow Only Hot or Cold Air? We bought the home in 2004 and the previous owner updated the furnace from electric to propane. What could it be? 5 Reasons Why Your Furnace Might Start Blowing Cold Air. Heater blows out cold air. Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. If you’re looking for some winter furnace maintenance, check out our post on the subject. When one or more of these components fails, the heat or cold air … i.e. 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. 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