Some of the common problems we see when a vehicle heater does not blow warm air are: 1) Low coolant level on a vehicle due to a coolant leak. Faulty Heater Fan. Low coolant levels, malfunctioning thermostat, broken control or a water leak. If your ducts have cracks or worse, … AC Accumulator/Receiver Drier. When heating my car up in the mornings the heater doesn't get to it's full warmth until I start driving. I put the heat on and about after driving a couple of miles with the heat on it would randomly blow out cold air. If the heater in your vehicle is not working properly, we recommend having it checked out by your trusted repair facility. If the heater is working fine, both these hoses will be hot to the touch. Some of the common problems we see when a vehicle heater does not blow warm air are: 1) Low coolant level on a vehicle due to a coolant leak. With the car COLD.. check the coolant reservoir. To see if this is the issue, add some more coolant under the hood. 4) Heater blower that is not functioning. A car’s cabin will heat up as the engine’s coolant heats up. Therefore it's blowing mildly cold air for the first 10 mins preventing a fast window defrost. 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. Lifewire / Maddy Price Reasons Why a Car Heater Stops Working . If you see steam coming out of your outdoor coil that is a normal operating procedure for a heat pump system, so don't be alarmed. 2) Thermostat that is stuck open. Serving Sedalia, Boonville, Clinton, Jefferson City, Marshall, Warrensburg and Central Missouri (800) 886-2701. The radiator, thermostat, belts, water pump and hoses are responsible for circulating water to the engine to keep it from overheating. Luckily, almost all of them are an easy fix for a certified heat pump repair team. Get shopping advice from experts, friends and the community! Reason why my car heater is blowing cold air and overheating the engine. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. The cooling system circulates a coolant through the engine that absorbs heat. I've made sure the coolant (50/50 mix) is filled to the line. i have a 2002 honda civic 1.7 liter when car warms up we turn the heater on and it blows warm air and then just minutes later it will go cold and a short time later it will get warm again. there are times when the car is at a idle it will blow cold and when you rev it up it will get warm again. There are primarily two designs, a Manual Control System and an Automatic Temperature Control System. Your car may be old and it may be the POS that you call it everyday but you can smile a little because your car’s problem can be fixed right at home. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. Is the heater blowing cold air into the car, or is the car heater not blowing any air at all? A few weeks ago my car started overheating and blowing cold air while I was on the highway. I will show in this video. If there is enough coolant in your vehicle, the heater core may be the culprit of cold air blowing through your vents. Luckily enough, this is an easy fix. Schedule an appointment and be in a warm car in no time. If your heat pump is blowing some cold air, there are a few things that may be going wrong. Radiator fluid runs through the engine and becomes hot. Our vehicle heater is designed to warm the passenger compartment. Other symptoms of this problem include: If these are happening, reach out to your certified service center to diagnose the issue. That heated coolant then runs through the radiator, where the heat dissipates. Axles, Bearings, Steering and Suspension Maintenance. Bottom line: Don't panic if you have a heat pump and if cold air blows out of your duct work for a little while on and off while you run your heat at home. Follow the steps we provide for each one, and you’ll be set for some warmer winter driving. This will not only cause cool air to blow through your vents, but it will prevent your vehicle from warming up the cabin. Dysfunctional Thermostat. Still Have a Heater that is Blowing Cold Air? why not blowing hot air? Your car may be old and it may be the POS that you call it everyday but you can smile a little because your car’s problem can be fixed right at home. SOURCE: Air Conditioner stops blowing cold air when vehicle is not moving plus one on the cooling fan problem. Despite its chilly name, coolant actually works hard to heat up your vehicle during colder months. This is actually a common problem that doesn’t really have a simple answer. 3) Plugged or leaking heater core. The controls of the heater system vary in most cars. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. Especially in extremely cold or hot outside temperatures. The fix is that you’ll need to have the air bubbles flushed out. The heater uses heat that is generated during normal engine operation that causes the coolant or antifreeze to get hot. Faulty Heater Fan. Replace? The vent that directs hot air into your cabin could be blocked, preventing the air from making it to your interior. Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. This started about a week ago. Coolant level is too low, so the heater core is not getting warm enough to transfer heat. why not blowing hot air? Something is wrong when that does not happen. If your coolant level is a-okay, but your car heater is blowing cold air and your engine is overheating, then you have a clog in your cooling system. There are a few different factors that could be causing the confusion with the airflow. If you have any questions or comments feel free to call us at 503-465-2926 or email us at [email protected]. This makes it unable to tell that the engine is warm enough to bring that coolant in, resulting in cold air blowing out. When you’re riding the streets of Atlantic City, Egg Harbor, and Vineland, one of the most annoying questions you might need to ask yourself is: “Why is my car heater blowing cold air?” Whether you love the cold weather or want nothing to do with it, one thing is for certain—a working heater makes winter driving much more pleasant. Reasons why car heater blows out cold air; What is wrong with my car heater? Many different things can go wrong here causing the whole system to work poorly or not at all. While you may be getting hot coolant/antifreeze into the heater core, the heater fan, the part that actually blows the heat into the cabin, can break or suffer an electrical short. If the heater is working fine, both these hoses will be hot to the touch. 2) Thermostat that is stuck open. Check It’s Size. A c ar heater blowing cold air could be a symptom of the failure of the heating … Coolant (which is a mix of water and antifreeze) is what circulates around the car’s engine. Low coolant level. If it is related to the engine cooling system, other issues can occur if you run your vehicle low or without the proper mix of coolant. The best way to check the reason behind your car heater blowing cold air AFTER you have verified that there is enough coolant in the radiator, is to touch both the heater hoses that connect to the firewall. With the frigid temperatures we have had in the past couple of weeks, many people are noticing that the heater in their car is not working at 100 percent. The heater core is like a mini radiator that is installed generally in the dash or near the firewall of the vehicle. The coolant fluid is the source of heat supporting the heating system. In cold weather the coolant is not needed to cool the engine, therefore it needs to circulate around the engine for a few minutes in order for the heater to feel warm. Sometimes corrosion and plugged inner tubes may be the culprit, or debris has interrupted the heater core fins. My car has 90000 miles. There are a variety of reasons why your car heating is blowing cold air: To help you discover what the possible reason is, BMW of Atlantic City will go more in-depth about these possible causes on why your car heater is blowing cold air. The engine cooling system uses a water pump to circulate liquid coolant (a proper mix of antifreeze and water), from the engine thru hoses to the radiator and heater core. Car Heater Blowing Cold Due to Cooling System Issue Other symptoms of this problem include: Fog inside your car; Your coolant is being used quicker than usual; You also might smell a sweet scent inside your car. If you notice that your thermostat gauge stays on the “C” even after the … car heater does not work, blowing cold air. If the furnace is cold, it cannot heat the air being propelled outside. As it passes through the engine, the water absorbs the heat and is then circulated through a heater core where a fan blows the warm air into the interior of your car… These issues might include: Your heat pump has a failing reversing valve. Troubleshooting a Car Heater Blowing Cold Air. car heater does not work, blowing cold air. 6037 E Black Horse Pike • Egg Harbor Township, NJ 08234, - Visit your dealership’s maintenance center and they can either fix or replace these controls for you. Coolant level is good. Air driven by the blower picks up the heat on its way into the passenger compartment. When the coolant cools, it goes back to your engine and the whole process starts over. The heater control system of a vehicle runs the blower motor, blend doors, and temperature operation. There … Simply put, the furnace inside the equipment needs to get heated up for the fan to emit warm air. If the valve is stuck closed, that may also answer the question, is your Toyota car heater blowing cold air. However, this is a relatively easy repair that the certified technicians at your dealership can quickly make. This element also defrosts your windows and plays an important part in keeping your vehicle toasty. In order for the aforementioned coolant to get to the place it needs to be and warm your car, your heater core needs to be working properly. The Automatic Temperature Control System, is a computerized management system, that is designed to keep the cabin at a selected temperature or even split the settings for the driver and passenger compartments. These devices use desiccant (like those little packets you find in a … Coolant is made up of half antifreeze and half water, and it’s used to cool the engine down-especially in the summer. You also might smell a sweet scent inside your car. If there is … Car Heater … Due to your heater core being the high point in your cooling system, air can actually flow through and get stuck. Here are a few things that you can check yourself that are likely the issue. At BMW of Atlantic City, we hope this article answered your question: “Why is my heater blowing cold air?” If you’re in need of heater repairs to keep you and your passengers comfortable this winter, visit our service center today! Not Enough Coolant On the other hand, your car heater may be blowing cold air due to not having enough coolant. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. 2901 South Limit Ave. Sedalia, MO 65301. 1. Active 7 months ago. 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. Once the heat from the coolant has been utilized, it is circulated thru the engine again to absorb more heat. Why is my car heater blowing cold air? Despite its chilly name, coolant actually works hard to heat up your vehicle during … If you're still not getting heat to your heaters, and you know the heater core is not blocked due to a clogged system, and you know there's no air in the system because you've bled the system using the bleed nipple on the right-hand side of the radiator, the … One of the most popular problems car heaters experience is when the thermostat is not working as it should. The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. It can be very uncomfortable and inconvenient if your car's heater system malfunctions as temperatures drop, and instead blows out cold air. Bryant Motors. While it keeps your engine cool, it also hovers above your heater’s core and blows all that warm air right into your vents, which in turn heats your cabin. if it was low on charge then as you slow down, condensor temps and line prressures would raise therefore it would cool at low speed and and not when moving since the incoming air would drop system temp,reducing line pressure and then cusing compressor to cycle. Why does my car sometimes blow cold air while the heater is on? The Thermostat is Stuck This system also can circulate some of that heated coolant through the heater core in the dashboard, sending warm air into the car once you turn on the heater. Viewed 89k times 6. However, the hot coolant also gives us the opportunity to use some of this heat to be directed to the heater core. If it’s where it’s supposed to be, proceed to step 2. If your vehicle has any problem with any of the mentioned components, you will have a car heater blowing cold air. Here are a few things that you can check yourself that are likely the issue. Until the engine warms up, there’s no heat for the heater core to extract. It could be that your heater is working just fine. Don't panic if you see frost on your outside equipment's coil. Copyright 2020 © All About Automotive Inc. Ask Question Asked 7 years, 1 month ago. Or they expect their car to be instantly warm and cozy like the home they just left. The heated coolant circulates thru the tubes of the heater core, and the heater fan blows air across those tubes and through the little fins encasing the tubes and directs warm air through the heating vents of the cabin of your vehicle. This heater core then passes the hot air it generates into the vehicle with a blower fan. Size is not a matter of preference. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. If your car has no heat, not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can pose a hazard while driving. The radiator is designed to expel excess heat. I took it to my mechanic and he found that the radiator was leaking. If your car has no heat, not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can pose a hazard while driving. The best way to check the reason behind your car heater blowing cold air AFTER you have verified that there is enough coolant in the radiator, is to touch both the heater hoses that connect to the firewall. Because the hot coolant results from waste heat in the engine block, … First step is diagnosing the root cause of the lack of heat.. Here’s some easy stuff for you to check. Search career opportunities at over 15,000 independently owned and operated NAPA AutoCare, Collision and Truck Service Centers. The coolant absorbs the heat from the engine, causing it to become hot. If your vehicle is lacking the proper amount of coolant, that hot air isn’t going to make it inside your car. Out of Coolant. I will show in this video. If there is enough coolant in your vehicle, the heater core may be the culprit of cold air blowing through your vents. We will also highlight the average repair cost for each cause. Reason why my car heater is blowing cold air and overheating the engine. the auxillary … First time experiencing this. or select -, Your coolant is being used quicker than usual. Damaged Ducts. If the heating and temperature gauges are misreading and giving you the wrong degrees inside of your vehicle, it’s because your thermostat is broken. Two weeks later the car was overheating and the heater was blowing cold air when I was on the highway. The heater control system of a vehicle runs the blower motor, blend doors, and temperature operation. 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. Break open the heater box and clean it out completely. While you may be getting hot coolant/antifreeze into the heater core, the heater fan, the part that actually blows the heat into the cabin, can break or suffer an electrical short. The heating system in your car is supposed to keep the atmosphere warm. The liquid then flows through the radiator and the air absorbs the heat and uses a fan to push it through your vents. How Does Your Car Heater Work? Conversely, if your engine temperatures are unrealistically low after a drive, your thermostat is likely the culprit. Once you've saved some vehicles, you can view them here at any time. Why is the Heater Blowing Cold Air Instead of Hot? When there’s cold air coming through your vents, it may be because your vehicle’s heater controllers are faulty. A fan blows over your heater core and directs warm air into the cabin. Over time and much usage, it’s common that these buttons and dials become clogged and broken, making it hard for them to send a message to heat your car. Temp gauge looks normal, and heat blows when car is moving. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. 5) Blend doors that are not functioning properly. 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