Temp gauge looks normal, and heat blows when car is moving. If you continue to have problems associated with duct leakage or your furnace blowing cold air, an HVAC professional can provide a more sophisticated analysis and duct sealing options for ducts that are not easily accessible. If it does, and you still want to close a few vents, try closing fewer vents this time. And, if your furnace does have a pilot light ignition, it may be time to consider upgrading to a new, pilotless gas furnace. Or, it may prevent the furnace from operating at all. I am just wondering if I hooked something wrong hooking up the thermostat , or perhaps I have a problem with the heat pump and need to call someone out to fix the problem. There is a good chance that you will find and correct the reason why your furnace is failing to produce warm air. 1 Answer. If it is, simply re-set the thermostat for heating, or change the setting to auto so it will automatically change between heating and cooling as temperatures change. Have an expert inspect your ducts along with the furnace. With the engine running, use a screwdriver to turn the bleed port anticlockwise to expel excess air. If so, your system may be circulating cooler air between heating cycles. This isn’t a problem when it’s 55 degrees outside—your system will expel air that’s a toasty warm 110 degrees or so. Your gas supply could be turned off. If your thermostat is properly set, ensure that it is getting power—check batteries, fuses and circuit breakers—and ensure that the interior components of the thermostat are clean. Your System Was Just Turned On. You might be able to tell if your ducts have a leak, but fixing them is another issue. 7 common reasons a heat pump blows cold air BEFORE READING FURTHER: Watch this video on how a heat pump works. If it won’t stay lit, it’s time to call a professional. And you wait — and wait — but the heater just blows cold air. Two Reasons Your Heat Pump Is Blowing Cold Air. Try opening all of your heat vents and see if that solves the problem. While that’s warm enough to raise the temperature of your home, it feels cool relative to your body temperature. Another reason why the air coming from your heat pump might feel chilly could be due to the fact that your body temperature is around 98.6°F and heat pumps blow air that is a temperature below that. If the pilot light is out, follow the manufacturer’s directions on how to relight the pilot. It will happen even if the heater core is functioning. One of the most common causes of a furnace blowing cold air is not actually a repair at all. If there is a reset button on your furnace, turn the valve to the pilot position and hold a flame to the dedicated pilot gas tube while pushing the button for about 30 seconds. Next, locate the pilot light assembly on your furnace and see if there is a flame. SOURCE: 1997 audi A4 heater blowing cold air You will have to change the heater core. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. If this is the case, you may also see an error message on your thermostat, or a flashing LED light on the furnace control board. Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. The flame sensor’s job, as its name suggests, is to detect a flame from the burner. 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. It started overheating and the heater blows cold air. Once the pilot is lit, turn the gas valve back to the ON position. Electric Heater Blowing Cold Air: Problems and Solutions Troubleshooter 1 of 6: No Time To Warm Up. And you wait — and wait — but the heater just blows cold air. My car has 180000 miles. If the furnace powers up, you should soon have heated air cycling through your home once again. To find out if your heat pump is actually blowing cold air, hold a thermometer up to the supply vent (the ones that blow out air) then hold it up to a return vent (the ones that suck air in). Neither your air conditioning nor your heater will be cold or hot right after you turn them on. Why a Heat Pump Will Blow Cold Air. If the heater has a tap for supplying coolant to the radiator, then this is closed or jammed because of rust. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Some of the most common issues include: Richard Epstein is a licensed master plumber with over 40 years experience in residential and commercial plumbing. You hear your furnace kick on... but there is no airflow or you find the furnace blowing cold air. A car heater system is essential during the winter or early in the morning when you need to heat your car for that comfortable ambience to work. If the heater still blows cold when there doesn’t appear to be a problem with the water level or the thermostat, it could be due to a blockage of air in the cooling system. To clean the sensor, turn off power to the furnace at the breaker box. If you just turned on the heat, hot air may not yet be flowing through your air ducts. The hot coolant flows in one side of the heater core and out the other side headed back toward the engine. A new furnace can offer higher energy efficiency, new product reliability and warranties, and no issues with pilot lights blowing out. The sound you hear is the reversing valve switching your unit over to cooling mode. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is the most likely explanation. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? If cleaning or replacing the filter doesn’t solve the problem, it’s probably best to contact your local HVAC professional to diagnose the issue. Inadequate gas supply. This article applies to the Ford F-150 (2004-2014) and F-250 (2005-2014). Before you hit the panic button thinking your trusty old gas furnace has picked a terrible time to go into hibernation, there are some legitimate reasons why normally functioning furnaces can give you the cold shoulder. 3) Pilot light is out If your gas furnace is only blowing cold air, then the pilot light may be out. Check the furnace’s air filter. If you’ve checked all of the easy-to-remedy reasons that can result in your furnace blowing cold air and you still haven’t solved the problem, it may be time to contact your local Carrier® indoor comfort expert to see if your furnace needs to be serviced, adjusted or replaced. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. Depending upon the age, condition and quality of the construction, your home’s ductwork may have some significant leakage. If the air feels warm for a moment or two, then switches to cold, it may be that the flame sensor is dirty. Possible Conclusion 1: It’s Not Blowing Cold Air Also if your water heater has issues, you can check out this Water Heater Troubleshooting Guide to efficiently solve the issue. How to Relight a Gas Water Heater That Produces No Hot Water, 3 Things to Check When Your Furnace Stops Working. 2. Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. 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. If you notice your furnace blowing cold air... an increase in your utility bills... or can actually feel warm air coming from seals or joints in your ductwork... it’s time to investigate. In extreme cases, an overheating furnace can cause damage to internal components such as a heat exchanger. So if gas furnace it has failed. If your furnace has a reset button (it’s often a red button located on the front, side or back of your furnace), try pressing it. If it’s dirty, change it! Whether you have a basic, 1-inch furnace filter or a more sophisticated electronic air cleaner or purifier, maintenance is the key to effective air filtration and proper furnace operation. While conventional gas or electric furnaces blow hot air, from 130 to 140 degrees for short periods of time, a heat pump will gently blow warm air, from 110 to 115 degrees and stay on longer to circulate it. If the fan limit switch malfunctions, the blower might continue to operate even when the furnace is not heating the air resulting in your furnace blowing cold air from your registers. Is it set for air conditioning instead of heating the air? If your heater starts by throwing warm air out of your registers, but you are soon left with a heater blowing cold air, then I would suspect that your flame sensor needs to be cleaned. When your heat pump blowing cold air, take advantage of these useful tips, and save yourself a little trouble. Because a pilot light is designed to burn continuously, it also uses more of your gas supply, which can be reflected in higher utility bills. If you have an older furnace with a standing pilot light, it’s possible that the pilot light is extinguished. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. If you still suspect the problem is a dirty air filter, consult your owner’s manual for instructions on removing and cleaning or replacing your air filter. It doesn't matter what vent setting it does this on them all. As a result, any air that blows out of the vents while your heater is off will usually feel cold. The middle of a harsh Ohio winter is no time to be confronted with a furnace blowing cold air. Only three options to control heating system temp. On my way to the destination, which was the whole 3 hours, the heater was blowing heat like normal. Most cooling systems have a bend door that controls the flow of the air through the heater core. Your furnace may be blowing cold air because the filter is too dirty. A dirty furnace filter can limit the airflow through your furnace and cause it to overheat, which will shut it off automatically. Air in the cooling system impedes the circulation of coolant in the system, and as a result, the heater blows hot air only when driving, and cold air at idle. Heat coming out on driver side only, cold air blowing out on passenger side. The air coming from your supply vent should be anywhere from 15-30 degrees hotter than the air near your return vent (depending on how cold it is outside). Core replacement seemed to fix the problem even though there was still a slight antifreeze smell we assumed was residual. 11. I have 2006 dodge nitro the passenger side vents all blow hot air but the driver side vents blow cold air. One of the most common causes of cold air blowing is that your utility company has cut off the heat. When your heat pump sometimes blows cold air even when the setting for heat is on, it’s an alarming problem and depending on the cause, a common enough one. The problem comes and goes now. Programmable models take it a step further, allowing you to schedule temperature changes throughout the day, up or down, based on times you are typically home, at work, or in bed asleep. Then, if possible, remove the sensor from the furnace. A furnace that frequently shuts off automatically may have other issues, such as a clogged air filter or blocked ducts that are causing the furnace to overheat. Typically, the flame sensor comes in the form of a rod that can be found near the back of the furnace, right in the path of the burner. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. 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. Just not sure where all the water goes so fast with no leak. If the filters are caked with dust, then it's likely the culprit behind your heater's malfunction. This can cause your furnace to lock down for safety. Show Less. Alt heat means the heat pump is turned off and the other source (usually gas furnace) is asked to heat. Or, if you have a high efficiency, multi-stage furnace, it might be operating on low stage heating and you just aren’t getting that full-on blast of heat you normally expect. If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. Satisfied Customers: … Changing the fan setting to auto will turn off the blower when the system is not actively heating. level 2. The coolant supply is blocked. Do this: Go to your thermostat and see if your home’s temperature is reaching the set temperature and shutting off. It could even be running in the air conditioning mode due to a malfunction. We wanted to address this, as many times homeowners think this is an issue with their heating and cooling system, but if they have a heat pump, it's actually Automotive Mechanic. Learn about our innovative products and how they can help improve your comfort. Heat was working on both side now only working on passenger side. All too often, restoring the flow of warm air is simply a matter of opening heat registers. Try kicking it up a notch to see if there’s a noticeable difference. Car is overheating Inspection: $79.99 - $89.99: Get a Quote : Marvin Sunderland. If you can see the burner in your furnace, you may be able to visually inspect the flame sensor for cracks in its porcelain base, or soot build up on its tip. The upper radiator hose is hot and the lower radiator hose is cold. Closing too many vents may cause the furnace to adjust by cycling on and off more frequently, which can reduce overall comfort in the house and can shorten the life of the furnace. Tell us about your home and preferences, and get a customized recommendation, Carrier contractors are ready to help you create your ideal home environment. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Category: HVAC. There are a lot of options when it comes to thermostats, but they all control both heating and cooling. It’s a natural phenomenon for heaters or air conditioners to blow out room temperature air right after they are turned on. To find out if your heat pump is actually blowing cold air, hold a thermometer up to the supply vent (the ones that blow out air) then hold it up to a return vent (the ones that suck air in). Change your furnace filters regularly to ensure that your furnace continues to work properly. There’s also nothing like the disappointment of discovering your furnace blowing cold air inside when it’s turning cold outside. Is there a way to then keep the compressor engaged, since temp will fall even with stage two running. Below is a list of possible causes. 2010 Laramie recently had heater core and evap replaced after having the same issues described in this thread with heat on passenger side and blowing cold air on drivers side. It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. My heater is set for 70 but it is blowing cold air. There could even be a puddle of liquid under the front of the vehicle. This function allows the furnace to warm up the air before the blower pushes it out through the ductwork and into your living areas. First, confirm that the light is out. Unreliable car heaters can make the cold winter months practically unbearable. If you don’t have an IR thermometer, simply watch your thermostat. Is the fan set to run constantly, even when the system isn’t heating the air? Items in red usually require a service call. Share this conversation . While your first instinct might be to call your HVAC contractor, your furnace might be operating normally. But if you have an older model furnace, your home is too cold and the furnace hasn’t turned on, your pilot light may be out. The heater blows cold air. Then, turn the gas valve to the off position and wait five minutes. Start by turning your heater off and inspecting the filters. Also, check the electrical switch at the furnace to make sure it is in the ON position. Many modern furnaces have a computer control board with coded LED lights that flash to provide you with information on problems with your furnace. There was also an antifreeze smell that got progressively worse. If your gas furnace doesn't start working at some point as you work your way through these troubleshooting steps, then the last step is to call a furnace professional. If the pilot doesn’t light on the first attempt, wait a few minutes and repeat the procedure, this time depressing the reset button for 45 to 60 seconds. Incorrect thermostat settings... a wave of cool air from your heat vent before the warm air arrives... and cool air circulating through the house because the constant fan setting is set to run when the furnace isn’t actively heating... these are all common reasons for a heating system blowing cold air. Well this happens sometimes and a few things can be the cause. Have an expert inspect your ducts along with the furnace. Failure of the transformer that provides power to the thermostat can also prevent it from sending signals to the furnace. Your gas supply could be turned off. If the heater has a tap for supplying coolant to the radiator, then this is closed or jammed because of rust. There are many reasons your car's heater isn't working. Either of these would be a clue that a malfunctioning flame sensor could be causing your furnace to shut down. Blocking air increases the air pressure in your air ducts, which may both cause and worsens airflow leaks—particularly at joints and seams. To make sure that your heat pump is actually blowing cold air, you’ll want to invest in an infrared (IR) thermometer. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. 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. It continues to blow when it's in auxiliary also but w/o heat just air. There are a few reasons your heat pump could be blowing cold air. Many of these are particular to more sophisticated high-efficiency condensing furnaces that use electronic ignition, and most homeowners prefer to call a service technician to deal with them. The flame sensor safeguards your furnace by ensuring that gas flows only when there is a flame to ignite it. Any idea? 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. My heat does not work it blows cold air and the heater and air only work on high. Pros recommend changing them once a month. Until the engine warms up, there’s no heat for the heater core to extract. Before checking your furnace filter, be sure the thermostat is set for heating and that the temperature setting is correct. A lack of heat can be a symptom of a much larger problem. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Your furnace may be blowing cold air because the filter is too dirty. Thought was head gasket, put steel seal in it , car runs now! Leaky ductwork not only leads to reduced comfort, it can result in higher utility bills because of the amount of heat lost due to the leakage. At the end of the heating process, it waits until the internal air temperature drops below its predetermined level, then shuts down the fan until the next heating cycle begins. Maybe the fan is malfunctioning. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Repeated overheating will hurt the furnace’s heat exchanger, which is expensive to fix. If you notice the air temperature in your home is cooler than normal... if the airflow from your heat vents seems to be weaker than usual... and/or if you hear the furnace running for short periods of time before shutting down (short cycling), you may have a dirty air filter to blame. This is a common problem with homes in the United States. Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Your thermostat settings need to be adjusted You have leaky air ducts Your fan limit switch settings need to be adjusted A dirty furnace filter is one of the most common causes of furnace malfunction. Show More. A stuck bend door means the air does not get into the core to turn hot. What Is a High-Temperature Limit Switch on a Furnace? Since the 1990s, the industry has shifted to using pilotless ignition systems such as hot surface igniters, so pilot-related issues are becoming less common. Details. Learn how to choose and maintain your HVAC system. Another common problem for a heater blowing only cold air is that the pilot light might be out. It is very cold here in the mid-west, and my system (geothermal heat pump) cannot keep up without engaging aux heat. The pilot light might simply just need to be re-lit, or the gas valve could have been shut off after last season’s use. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower than expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. 2013 explorer, is there a separate - Answered by a verified Ford Mechanic Blocking heating vents causes your furnace to work harder and longer than intended and can shorten its life. The fan limit switch measures the air temperature inside the furnace or hot air supply plenum and controls blower motor operation. Closed heat registers can cause other issues, as well. The heat from the hot coolant is what your heater normally blows throughout the inside of the car. A lot of air came out and slightly warmed but went cold again!! Or the gas line isn’t supplying enough gas to your furnace. Either way, this is a problem you can fix by ringing up the company. A few days later on the way back home, roughly 2 hours into the trip, the heater was blowing cold air. If your heater is blowing warm air but that air is venting into the attic or mixing with colder air from your attic, then the net result will be that your heater is blowing cold air. Category: HVAC. When the furnace starts heating, the fan limit switch waits until the air reaches a predetermined temperature before turning on the fan to blow warm air into the home. Maybe the fan is malfunctioning. Since the heater core is often the high point in a cooling system, air can move into it and become trapped. Pilot lights used to be a standard component on any gas furnace before the 1990s. With a dirty flame sensor, your gas burner won’t stay lit, causing the air to go cold soon after the furnace turns on. Heat Pumps and Electric Home Heating - Heat pump not blowing cold air - Thermostat was set to 76. fan speed, and vent option. You want to curl up in a cozy house after you deal with harsh weather conditions, so it’s time to take a look at the reasons the furnace may be blowing cold. Or the gas line isn’t supplying enough gas to your furnace. Dust and debris inside the thermostat can cause it to malfunction. The heat pump is blowing cold air when the thermostat was set to heat. A properly working flame sensor will shut down the furnace if it does not detect a flame while the gas valve is operating. Basic filters are often inside the furnace cabinet, but larger, 4-inch media filters, electronic air cleaners, and whole-home air purifiers are likely mounted outside the furnace between the cabinet and the return air duct. Changing the air filter can possibly fix the cold air problem, but only if that’s the only problem that is keeping the heat from blowing hot air as opposed to cold air. Tim H., HVAC Professional. Answered in 1 minute by: 11/2/2012. I have tried turning it off and on going through all the different modes - which have also shown some more strange ones such as eheat. Less commonly, if you have a duel-fuel system (heat pump/gas furnace combination) the heat pump will warm your home with a lower air temperature than provided by the gas furnace, which could make it seem like your system is blowing cold. With a heater blowing cold air, the first question to address is whether the cold air is blowing from the furnace right after the heater is turned on. To see if the cool air is your mind playing tricks on you or a real problem, use an infrared (IR) thermometer to measure the temperature of the air coming out of your vents. It can be very uncomfortable and inconvenient if your car's heater system malfunctions as temperatures drop, and instead blows out cold air. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Many furnace models include a fan limit switch with a function called “blower on delay”. If your heater is blowing cold air, and it’s not one of the first two possible explanations on this list, then you’ll need a specialist to at least come and take a look. Learn about our energy efficient innovations that can help you save on your heating & cooling energy expenses, while ensuring your home is comfortable. This time of year, especially when it gets cold outside in the evenings, we get many calls from homeowners concerned that there is cold air blowing out of the duct registers in their home when their heat is running. Unaddressed, dirty furnace filters can cause extensive, and expensive, damage to your home’s heating system. Scrub the sensor gently to remove dust and other residues. 8 Common Problems With Conventional Gas Furnaces, Troubleshooting an Electronic Ignition Furnace That Won't Light, Troubleshooting an Intermittent Pilot Ignition System, How to Light the Standing Pilot Light on a Gas Furnace, How to Troubleshoot Electric Ignition Furnace Problems, How to Replace a Furnace Thermocouple or Electronic Flame Sensor, How to Check a Pilot Light on a Gas Furnace, Troubleshooting Common Problems With a Gas-Fired Hot Water Boiler. A lack of heat can be a symptom of a much larger problem. This is the reason that it takes a while for heaters to start blowing warm air. Make sure that your thermostat is set to HEAT, not COOL, and ensure that the fan is set to AUTO. Another common problem is when air gets into the cooling system. If cleaning or replacing the filter doesn’t solve the problem, contact your local Carrier dealer for assistance. It is possible that the door to your furnace has been left open or closed improperly, particularly if you’ve recently changed your furnace filter or done other maintenance. 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. Problem: Heater is blowing cold air. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. Tried to bleed air from coolant/ heater core lines, but … Not yet. This can cause the air to feel only lukewarm. Check the temperature setting to make sure somebody else didn’t change it to a lower setting. 11. If the pilot light won’t stay lit, it’s possible that there is an issue with the thermocouple or ignition system. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. More often than not, electric heaters blow cold air when its filters are clogged, and that's why it's the first thing you should check. Things: turn off the heat pump blowing cold air registers open to prevent pressure. You might be able to tell if your ducts have a leak, but they all control both and. To keep you more comfortable by eliminating an initial blast of cold air and the lower radiator hose hot... Extensive, and save yourself a little trouble have you cranked up your thermostat to knock the chill down to. Out if your ducts have a bend door that controls the flow of the most common causes a. Properly and is getting to the furnace if it gets too hot or there. Left in the off position it gets jammed, the heater was cold... The lower radiator hose is hot and the heater was blowing cold air, try 2. Driver side only, cold air when it comes to thermostats, but those the. Maintenance or repair work has recently been done on the heat, but they all control both heating that! 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