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. Your furnace may be blowing cold air because the filter is too dirty. the only way for heat to be generated is for hot coolant to go through the heater core. Before you learn the reasons your heater is blowing cold air, what should you immediately do if you notice this? When he turned on the air conditioner, warm air came out. 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. If it is set to “ON”, it will continue blowing air … 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. Air in the cooling system. You can hear it blowing, but no heat is coming out. Why is the heater blowing cold air from the vents - YouTube Water Leaks Check the hoses, radiator, and water pump, for any leaks or damage. Even more strange, the previous owners had rewired the system somehow so the air handler came on every time, even for air conditioning. that's why it looks like a radiator, it works like a heat exchanger but the purpose is to heat the car. First things first, check if the cold air is blowing right after the heater is turned on. If gas supply is interrupted for any reason, the gas furnace pilot light will go out. It’s also possible you have it on the wrong setting, such as ‘fan’ as opposed to ‘heat’. If the problem persists, check out the below reasons to better troubleshoot the problem. Also radiator fan does not come on. This will lead to heat blowing out cold air. 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. Tags: AC, AC maintenance, AC repair, air conditioner maintenance, air conditioner repair, air conditioners, energy efficiency, furnace maintenance, HVAC, HVAC maintenance, HVAC repair, thermostat. The heating system can also blow cold air if there are big air bubbles in the coolant fluid. All you need is a shop manual, a 1/4-in.-drive socket set and screwdrivers. This was part of the problem our friend was dealing with. If your heater is blowing cold air, then there are multiple possible causes for the issue. 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. These are the most common culprits when it comes to electric heater troubleshooting if your heater is blowing cold air. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Heater Blowing Cold Air? A system error in the controls of the heat pump was forcing an automatic system shutdown just seconds after it started. The harder it has to work to pull air through the filter, the less efficient it will be. I have a 2008 535I Sport sedan with 100k miles on it. You can usually diagnose and fix the problem yourself in about an hour. 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. It’s human nature to expect a simple explanation for a major problem. If you need a professional and you live in our service area, we’d love to help. 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. It’s a natural phenomenon for heaters or air conditioners to blow out room temperature air right after they are turned on. 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. 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. These issues might include: Your heat pump has a failing reversing valve. If that happens, your heater (or AC) will not produce the temperature of air you want it to. Damaged Ducts. 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. And you wait — and wait — but the heater just blows cold air. Sometimes this happens simply because your batteries have died. So what’s defrost mode? Or not if your car heaters are not working. The furnace blowing cold air, or there is no heat in the house. That way, your blower won’t run 24/7 and thus send cold air through the vents if the room reaches the desired temp. What could possibly be the problem? 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. A couple of things could potentially go astray with your furnace because there are various components working together to distribute heat around your home. Is the Pilot Light lit? Frost on the outside coil is condensation that forms up on the coil in the form of frost. You can follow any responses to this entry through the RSS 2.0 feed. 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. Check the furnace’s air filter. The problem your car heaters are not working making the emergency heat have died working... 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