Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position Your thermostat has an ON and AUTO switch that runs your blower. the only way for heat to be generated is for hot coolant to go through the heater core. Still Have a Heater that is Blowing Cold Air? This will lead to heat blowing out cold air. Both comments and pings are currently closed. Plugged heater core. Also if your water heater has issues, you can check out this Water Heater Troubleshooting Guide to efficiently solve the issue. As a result, you end up with cold air venting out. … Or not if your car heaters are not working. Otherwise it has to work a lot harder just to pull the air, which means you’ll get less warm air coming out than you should. It’s a little more complicated than that in practice, but these are … The fan setting on your thermostat has two options, “on” and “auto”. If you notice your HVAC blowing cold air, try turning your furnace off and then on. 9 Posts . For a heat pump or heater to produce warm air, air must flow easily through the filter. Their improper installation thus led to the air conditioner blowing hot air. First – make it worse. That way, your blower won’t run 24/7 and thus send cold air through the vents if the room reaches the desired temp. Temp.gauge going to hot blowing cold air heat not working replaced radiator and thermostat still overheating 2005 Infiniti G35. If you need a professional and you live in our service area, we’d love to help. Clogged air filters could be causing cold air to blow out of your vents. that's why it looks like a radiator, it works like a heat exchanger but the purpose is to heat the car. Airflow Issues: Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. While you may not feel cold air blowing from your heater, air blocked by dirt and dust is likely to be cooler than your desired temperature. Why is the heater blowing cold air from the vents - YouTube 3 Reasons For Heater Blowing Cold Air In House. Hence the hot air. The last five items on the list above require a professional or a new furnace or heat pump to fix them. This entry was posted Sometimes this happens simply because your batteries have died. For 120 years, we’ve been proudly turning houses into comfortable homes. But if your car heater blows cold air and you’ve checked both heater core hoses to make sure they’re hot, you likely have a bum blend door actuator. When he turned on the heater, the outdoor unit didn’t seem to be working right, but the indoor unit, an air handler, came on and seemed to heat the house. If the coolant has air bubbles, the heat will not be transferred appropriately to the coolant. Why Your Heat Pump Isn’t Working In Cold Weather, Choosing The Most Energy Efficient Home Heating System, What to Do When Your AC Drain Line Is Clogged, Reasons Your Home Isn’t Getting Warm Enough. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. Antifreeze Be sure to have antifreeze in your coolant to prevent freezing in cold temperatures. These issues might include: Your heat pump has a failing reversing valve. Is your heating blowing cold air in your home and you just don’t know how to go about it? Check the furnace’s air filter. If you hear that irritating screeching sound when your system turns on, this could be the reason (though it’s not the only reason that happens). So what’s defrost mode? Maybe the fan is malfunctioning. If that happens, your heater (or AC) will not produce the temperature of air you want it to. Before you learn the reasons your heater is blowing cold air, what should you immediately do if you notice this? Coolant not flowing through the heater core. this is why people say to turn your heat on if it looks like your car is overheating, because you're exchanging heat from the coolant through the heater core. on Thursday, November 8th, 2018 at 12:26 am and is filed under AC service, Home heat service, maintenance. Check the air filter. Naturally, all heaters use a fan to blow air, but if your fan setting is set to ‘on’ throughout the day, it explains why the heater seems like it has malfunctioned. Size is not a matter of preference. I have a 2008 535I Sport sedan with 100k miles on it. By Climate Control Blogger in Blog , Heating , Home Maintenance When the heating system turns on, we all expect warm air to keep our Glenwood Springs, Aspen, or Vail, CO home comfortable even during the coldest winter weather. The previous owners in our friend’s house probably realized their heat pump was failing, so they rewired the system in a convoluted way to get around the problem, rather than deal with it properly. Hi - sounds like you may have multiple problems with your engine cooling and passenger heating systems. Click the link below, scroll down to see if you’re in our service area, and if you are, tell us what’s going on with your HVAC system. It could be that your heater is working just fine. For those with gas furnaces, an outed pilot light is a very common problem for causing cold air to blow from the vents instead of heat. Do I Really Need to Clean My Gas Fireplace. Is the Pilot Light lit? Maybe it just died of old age or malfunction. You start it up and hit the heater. 2012 Base model 1.8NA I changed heater core over the weekend. (Heat works when it’s 55 degrees out … Don’t worry: we’ve outlined some of the most common causes of the problem below. You can usually diagnose and fix the problem yourself in about an hour. You can hear it blowing, but no heat is coming out. The heating system can also blow cold air if there are big air bubbles in the coolant fluid. But your HVAC system is very complicated. (This problem depends in part on the type of thermostat, of course). If you are unsure if your location is within our service area, please contact us to find out! There … There could be two possible causes for this: The thermostat fan is set to “ON” The fan in the furnace is responsible for blowing heated air through the vents. As a result, the coolant running through the heating core will be cold, resulting in cold air blowing through your heat … Check It’s Size. His heat pump was starting up and then shutting off immediately, and the emergency heat was taking over. Also radiator fan does not come on. Several underlying causes are there for which the coolant and the air do not go through their designated paths. But the heat pump was also just very old, and repairing it would have cost nearly the same as just getting a new one, which is what they ended up doing. Likewise for the air conditioner. 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 result will be that your heater is blowing cold air. When he had a professional look into why this was happening, he learned it would be an expensive repair job on an outdated heat pump. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. |. If your heater is blowing cold air, then there are multiple possible causes for the issue. It’s human nature to expect a simple explanation for a major problem. Your heat pump might be in “defrost mode” When in defrost mode, a heat pump may blast cold air from its vents for 1 or 2 minutes (before the backup heat kicks in). Gets up to temp and still nothing. If your ducts have cracks or worse, then the cold air blowing into your house might be coming straight from outside right into your ducts, mixed in with the warm air your perfectly functional furnace is producing. Pilot … That’s what our friend’s former homeowners appear to have done. A new door actuator costs less than $100. 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. These simple fixes might solve the problem, saving you lots of trouble, frustration, and expense. If gas supply is interrupted for any reason, the gas furnace pilot light will go out. The furnace air filter is … Seasonal Heating Maintenance: Why Do You Need It? Damaged Ducts. Heater Blowing Cold Air? ©2020 Moncrief Heating & Air Conditioning If so, your heat pump is blowing warm air that just feels cold to you. Though on closer inspection, the heat seemed pretty weak. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. A car heater blowing cold air could be a symptom of the failure of the heating unit. You can try cleaning the radiator and check if a crack has not been created where the liquid can come out or air can enter. Replace the control buttons of your heater control valve by locating the switch underneath your hood. These are the most common culprits when it comes to electric heater troubleshooting if your heater is blowing cold air. This was part of the problem our friend was dealing with. Check the fan setting on your thermostat, and if it’s set to ON, switch to AUTO. They worked around a failed heat pump by making the emergency heat the main heat. What could possibly be the problem? You’re standing there pushing buttons trying to heat up the house, but it’s just not working. Furnace-related problems cause many homeowners to scratch their heads. Not in our service area: Granite Falls, Lake Stevens, Marysville, Renton. Check the thermostat. Third – hire a professional. A system error in the controls of the heat pump was forcing an automatic system shutdown just seconds after it started. 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. It’s also possible you have it on the wrong setting, such as ‘fan’ as opposed to ‘heat’. You might be able to tell if your ducts have a leak, but fixing them is another issue. Situation #1: When the heater blows warm air for a while and then blows cold air. You may have noticed a loud sound right before cold air blows out through the vents in your home. If you suddenly notice your heater blowing cold air instead of the warm air you desperately want in your home, it could be due to various simple reasons. It could be that your heater is working just fine. If your heat pump is blowing some cold air, there are a few things that may be going wrong. The thermostat’s fan is set to ON. If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. Water Leaks Check the hoses, radiator, and water pump, for any leaks or damage. You might even try turning your circuit breaker off and back on. The harder it has to work to pull air through the filter, the less efficient it will be. It’s a natural phenomenon for heaters or air conditioners to blow out room temperature air right after they are turned on. This rendered the AC useless. The furnace blowing cold air, or there is no heat in the house. They work by using the heat in the coolant system that circulates around the car's engine to cool it. A friend of ours bought a new house recently. Motors that turn the fans and make the conversion process from warm to cold (or cold to warm) work right can get old and rusty, or break down for other reasons. Still blows cold air. I live in a condo...my cold air vents blow out air...the air in my condo is stale I have forced air Trane - Answered by a verified HVAC Technician. There is one vent that blows cold air, the others are working okay. Second – test out the simple explanations. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat … If you’re unable to warm your home with your furnace, and you’re looking for Heating And Air Companies in Atlanta, Moncrief Heating & Air Conditioning can help. That sounds a little odd right? So, when the new homeowner called an HVAC specialist (not us, because he was outside our service area – click here and scroll down to see if you’re in it), he learned what was really happening. If the problem persists, check out the below reasons to better troubleshoot the problem. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known. If your ducts have cracks or worse, … Discussion Starter • #1 • Jan 8, 2014. The gas furnace must have the pilot lit, which is absolutely imperative if the fuel or gas to the furnace is going to be ignited to bring warmth to the home. Again, this depends on your specific type of thermostat. Why tell this story? If you’re unable to warm your home with your furnace, and you’re looking for Heating And Air Companies in Atlanta, Moncrief Heating & Air Conditioning can help. Your furnace may be blowing cold air because the filter is too dirty. The heater’s blowing cold, or the AC is blowing hot. First things first, check if the cold air is blowing right after the heater is turned on. Most electric heaters have dual settings, and if your heater blows both cold and warm air at different times, you should check your thermostat. I have a question about a forced air gas heater. Luckily, almost all of them are an easy fix for a certified heat pump repair team. The machine usually takes time to warm up as … Frost on the outside coil is condensation that forms up on the coil in the form of frost. Now that the cold weather is back, we'll be whacking the car's heater on the second we turn the key. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Pilot Light Is Out Gas furnaces require an ignition source called a pilot light through which natural gas can move and combust to create heat. The sound you hear is the reversing valve switching your unit over to cooling mode. Details. Dirty filters and dirt buildup in your vents may block warm air from passing through quickly, leading to cold air infusing into your warm air. Maybe it got shorted out. Even more strange, the previous owners had rewired the system somehow so the air handler came on every time, even for air conditioning. The heater’s radiator clogs over time making it harder for the coolant to pass through its bearings, leading to slightly warm air or completely cold air blown at idle. That was tripping on the air handler, which was supposed to be only for emergency heat. And, it increased their heating costs a ton, because the air handler is a far more expensive way to heat a house than the much more efficient heat pump. You can follow any responses to this entry through the RSS 2.0 feed. But a dead circuit board ends your furnace’s attempt to heat your house real quick. Need help! It’s how we've become Atlanta's most trusted heating and cooling company. But all you have to work with are the symptoms. A couple of things could potentially go astray with your furnace because there are various components working together to distribute heat around your home. There are many reasons your car's heater isn't working. Also if your water heater has issues, you can check out this Water Heater Troubleshooting Guide to efficiently solve the issue. If it is set to “ON”, it will continue blowing air … Air in the cooling system. Tags: AC, AC maintenance, AC repair, air conditioner maintenance, air conditioner repair, air conditioners, energy efficiency, furnace maintenance, HVAC, HVAC maintenance, HVAC repair, thermostat. There could be various reasons for car heater not working but it basically happens for two reasons: air from the blower is not blow toward the heater core or the coolant does not flow through the heater core. Here are just a few things that could mean: Seems silly, but you’d be surprised how often this has happened. This will cause your heater to blow cold air instead of hot. 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