Our Lennox system is doing the same thing now for several months. 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. In other words, it's not putting out any heat at all. William Reed on February 18, 2017: Hi my name is william and i have a 2005 dodge magnum. 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. The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. 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. ... because it gets automatically deducted. Chevrolet Silverado 1999-2006: Why Do My Vents Blow Only Hot or Cold Air? Just purchased a condo in AZ. It must push out the cold air from the vents before the warm air … level 2. 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 plenty warm to heat your home to your desired 72°F. As a result, any air that blows out of the vents while your heater is off will usually feel cold. 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. 5 Reasons Why Your Furnace Might Start Blowing Cold Air. Heater working but only blows out front vents. My husband and I have a propane furnace. I fixed it for a homeowner in that subdivision, and they told their neighbors, and … Think of it like turning on a hot water tap. I set desired temp to 70. ), so the temperature actuators generally fail first. 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. JustinRandy131. What could it be? Well this could be caused by several things. We bought the home in 2004 and the previous owner updated the furnace from electric to propane. The same vents that provide my AC in the summer also provide heating in the winter. It could even be running in the air conditioning mode due to a malfunction. 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. Reasons Your Furnace is Blowing Cold Air. I have a 2010 Nissan Armada that is not blowing hot air when the heat is set on 90. i.e. This might sound crazy, but a heat pump can be working just fine even if the air feels cold. What is this and how can I stop this from occuring? 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. Have an expert inspect your ducts along with the furnace. As nuts as it may sound, the air in your home can feel chilly even though the heat pump may be working completely fine. Again this is when the heat is on. 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. 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. Then heat starts to appear fine. I have noticed that when my heating is off in the winter, I can feel cold draft air coming from the vents in my home. Check that the fan blower switch is … 1. share. Hello, My furnace blows code air from vents when heat is off. 5 Reasons Cold Air Comes Out of Your Vents When You Turn On the Heat This issue could be caused by an improper thermostat setting. No heat to feet or defrost. Been to Nissan twice. The A/C is blowing cold air and is working 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? ... Nissan Rogue 2016 heating problem I noticed in my car today that my air vents are only blowing room temperature air. Aside from the vents blowing out the dash at the driver and passenger, on the cars with the faulty calibration of the radiant heat sensor, you will also get cold air out the defrost vents and the floor vents. The cold air return lets in cold air when the furnace is off. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. But as it turns out, this is a furnace problem that comes up often in many Bay Area I have a combination AC/furnace system in my home. I changed two conditions. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? Why is cold draft air coming out of the vents? 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. Maybe your heater is not blowing hot air even though the fan is running. 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. 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. Report Save. Items in red usually require a service call. All vents are on the opposite side of the house than the furnace. 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