Tim H., HVAC Professional. 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. 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. Well this could be caused by several things. 6. Or the gas line isn’t supplying enough gas to your furnace. While your first instinct might be to call your HVAC contractor, your furnace might be operating normally. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. 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. We lost power for 4 days and just got it back. The coolant supply is blocked. Below are some reasons you may be getting a blast of chilly air and how you can warm up your house as soon 1as possible. There could even be a puddle of liquid under the front of the vehicle. 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). A properly working flame sensor will shut down the furnace if it does not detect a flame while the gas valve is operating. I came home from work and the house was 80 degrees. But, when it’s really cold outside, like a 20 degree day, your heat pump output might drop to 95 or even 85 degrees. Many modern furnaces have a computer control board with coded LED lights that flash to provide you with information on problems with your furnace. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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. 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. It use to work months ago on every setting but always made a really loud noise when on until it only worked on high still make a kinda loud sound. Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. 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. Ensure that there is actually a problem when your heat pump is blowing cold air. Is there a way to then keep the compressor engaged, since temp will fall even with stage two running. Start by checking that your thermostat is set properly. What Is the Cost to Buy or Replace a Home Furnace? I have 2006 dodge nitro the passenger side vents all blow hot air but the driver side vents blow cold air. If you’re wondering why your heater is blowing out cool air, the first thing you should do is check your thermostat and make sure it’s set to the correct temperature. Check the temperature setting to make sure somebody else didn’t change it to a lower setting. If you have an older furnace with a standing pilot light, it’s possible that the pilot light is extinguished. Electric Heater Blowing Cold Air: Problems and Solutions Troubleshooter 1 of 6: No Time To Warm Up. 2. If the pilot light won’t stay lit, it’s possible that there is an issue with the thermocouple or ignition system. Major duct problems. Simply turn your system on, and hold your hand over joints, connections, or anywhere you can visibly see a seal in the ductwork. Some of the most common issues include: Richard Epstein is a licensed master plumber with over 40 years experience in residential and commercial plumbing. When it gets jammed, the heater will be blowing cold air. Until the engine warms up, there’s no heat for the heater core to extract. Whether you are in the midst of a 110° heat wave or the arctic chill to end all arctic chills, you expect your HVAC vents to blast you with the desired dose of cold or hot air. Either way, this is a problem you can fix by ringing up the company. Category: HVAC. Thought was head gasket, put steel seal in it , car runs now! The problem comes and goes now. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. A dirty sensor can be simply cleaned by your local Carrier dealer for an inexpensive repair. 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. 23 years of experience. Fortunately, this is usually an easy fix. A malfunctioning flame sensor shuts down the furnace when the burner is working correctly (flames are present) because it does not sense the heat. Inadequate gas supply. To clean the sensor, turn off power to the furnace at the breaker box. All too often, restoring the flow of warm air is simply a matter of opening heat registers. Frost on the outside coil is condensation that forms up on the coil in the form of frost. 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. Details 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. 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. The flame sensor’s job, as its name suggests, is to detect a flame from the burner. It can feel cool for the first few minutes because the engine has to warm up in order for the coolant to heat up and provide heat to your interior. This helps to prevent natural gas (or propane) from continuing to flow into the home’s air supply. Change your furnace filters regularly to ensure that your furnace continues to work properly. If maintenance or repair work has recently been done on the furnace, this switch may have accidentally been left in the OFF position. In such a case, there could be an easy solution, particularly if your thermostat setting is the problem. Posted on Nov 13, 2008 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. Your furnace may be blowing cold air because the filter is too dirty. 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. If the heater has a tap for supplying coolant to the radiator, then this is closed or jammed because of rust. In the dead of winter, there’s nothing quite like the instant relief you get when holding a cold hand over a warm heat vent. 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 furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. There’s also nothing like the disappointment of discovering your furnace blowing cold air inside when it’s turning cold outside. 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. If cleaning or replacing the filter doesn’t solve the problem, contact your local Carrier dealer for assistance. Pros recommend keeping at least 80 percent of your heating registers open to prevent unnecessary pressure in your furnace and ducts. Once the pilot is lit, turn the gas valve back to the ON position. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? The following are some issues that may be causing the heater to blow cold air: Low coolant levels; A plugged/clogged heater core; A faulty thermostat (thermostat that is stuck) Broken blower and/or blower motor; Heater core bypass hoses that have … Then, turn the gas valve to the off position and wait five minutes. Repeated overheating will hurt the furnace’s heat exchanger, which is expensive to fix. SOURCE: 1997 audi A4 heater blowing cold air You will have to change the heater core. Lack of maintenance can lead to build-up of dirt, dust and other airborne pollutants that can clog your filter, restrict airflow and lead to both discomfort or in more extreme cases, system failure. A dirty furnace filter is one of the most common causes of furnace malfunction. When a heat pump begins the defrost cycle, the outdoor fan shuts off and the system switches over to cooling mode. One of the most common causes of a furnace blowing cold air is not actually a repair at all. You may have noticed a loud sound right before cold air blows out through the vents in your home. 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. Your Fan Is On 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. 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. Finally, reattach the sensor and restore power to the furnace. 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. 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