Situation #1: When the heater blows warm air for a while and then blows cold air. Don’t worry: we’ve outlined some of the most common causes of the problem below. 2012 Base model 1.8NA I changed heater core over the weekend. 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. Water Leaks Check the hoses, radiator, and water pump, for any leaks or damage. A new door actuator costs less than $100. That way, your blower won’t run 24/7 and thus send cold air through the vents if the room reaches the desired temp. 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. The last five items on the list above require a professional or a new furnace or heat pump to fix them. Heater Blowing Cold Air? 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. Is your heating blowing cold air in your home and you just don’t know how to go about it? Again, this depends on your specific type of thermostat. Furnace-related problems cause many homeowners to scratch their heads. Check the fan setting on your thermostat, and if it’s set to ON, switch to AUTO. 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. This will cause your heater to blow cold air instead of hot. First – make it worse. If that happens, your heater (or AC) will not produce the temperature of air you want it to. A system error in the controls of the heat pump was forcing an automatic system shutdown just seconds after it started. If you are unsure if your location is within our service area, please contact us to find out! This will lead to heat blowing out cold air. It could be that your heater is working just fine. 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. I have a question about a forced air gas heater. 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. Check the thermostat. That’s what our friend’s former homeowners appear to have done. Clogged air filters could be causing cold air to blow out of your vents. Second – test out the simple explanations. So what’s defrost mode? There are many reasons your car's heater isn't working. 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. Or not if your car heaters are not working. 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. Replace the control buttons of your heater control valve by locating the switch underneath your hood. Antifreeze Be sure to have antifreeze in your coolant to prevent freezing in cold temperatures. 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. 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. It’s how we've become Atlanta's most trusted heating and cooling company. That sounds a little odd right? You’re standing there pushing buttons trying to heat up the house, but it’s just not working. 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. As a result, the coolant running through the heating core will be cold, resulting in cold air blowing through your heat … Sometimes this happens simply because your batteries have died. This rendered the AC useless. Pilot … Air in the cooling system. You can hear it blowing, but no heat is coming out. Still Have a Heater that is Blowing Cold Air? Now that the cold weather is back, we'll be whacking the car's heater on the second we turn the key. Plugged heater core. If the problem persists, check out the below reasons to better troubleshoot the problem. (Heat works when it’s 55 degrees out … 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. The heating system can also blow cold air if there are big air bubbles in the coolant fluid. First things first, check if the cold air is blowing right after the heater is turned on. 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. They work by using the heat in the coolant system that circulates around the car's engine to cool it. The heater’s blowing cold, or the AC is blowing hot. They worked around a failed heat pump by making the emergency heat the main heat. Third – hire a professional. (This problem depends in part on the type of thermostat, of course). 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. The thermostat’s fan is set to ON. I have a 2008 535I Sport sedan with 100k miles on it. 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. Both comments and pings are currently closed. For 120 years, we’ve been proudly turning houses into comfortable homes. You may have noticed a loud sound right before cold air blows out through the vents in your home. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Details. You might even try turning your circuit breaker off and back on. This was part of the problem our friend was dealing with. Damaged Ducts. 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. What could possibly be the problem? Several underlying causes are there for which the coolant and the air do not go through their designated paths. But all you have to work with are the symptoms. Size is not a matter of preference. There is one vent that blows cold air, the others are working okay. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. Even more strange, the previous owners had rewired the system somehow so the air handler came on every time, even for air conditioning. Is the Pilot Light lit? If it is set to “ON”, it will continue blowing air … The sound you hear is the reversing valve switching your unit over to cooling mode. ©2020 Moncrief Heating & Air Conditioning Check the furnace’s air filter. Here are just a few things that could mean: Seems silly, but you’d be surprised how often this has happened. If the coolant has air bubbles, the heat will not be transferred appropriately to the coolant. The furnace air filter is … As a result, you end up with cold air venting out. 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. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. This entry was posted 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). Here are the 5 common reasons why this happens. One of the most common causes of a furnace blowing cold air is not actually a repair at all. You start it up and hit the heater. 9 Posts . Hence the hot air. … A friend of ours bought a new house recently. It could be that your heater is working just fine. 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. Coolant not flowing through the heater core. The harder it has to work to pull air through the filter, the less efficient it will be. If gas supply is interrupted for any reason, the gas furnace pilot light will go out. Though on closer inspection, the heat seemed pretty weak. 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. |. You might be able to tell if your ducts have a leak, but fixing them is another issue. A couple of things could potentially go astray with your furnace because there are various components working together to distribute heat around your home. Hi - sounds like you may have multiple problems with your engine cooling and passenger heating systems. 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. 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. His heat pump was starting up and then shutting off immediately, and the emergency heat was taking over. You can follow any responses to this entry through the RSS 2.0 feed. If so, your heat pump is blowing warm air that just feels cold to you. Also radiator fan does not come on. Your furnace may be blowing cold air because the filter is too dirty. 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. The furnace blowing cold air, or there is no heat in the house. But a dead circuit board ends your furnace’s attempt to heat your house real quick. Frost on the outside coil is condensation that forms up on the coil in the form of frost. If you notice your HVAC blowing cold air, try turning your furnace off and then on. 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 Pilot Light is Out. Most electric heaters have dual settings, and if your heater blows both cold and warm air at different times, you should check your thermostat. Maybe it just died of old age or malfunction. All you need is a shop manual, a 1/4-in.-drive socket set and screwdrivers. It’s a little more complicated than that in practice, but these are … the only way for heat to be generated is for hot coolant to go through the heater core. Seasonal Heating Maintenance: Why Do You Need It? Before you learn the reasons your heater is blowing cold air, what should you immediately do if you notice this? Do I Really Need to Clean My Gas Fireplace. 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. 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