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why is my heat blowing cold air in my car

The heater core is like a mini radiator that is installed generally in the dash or near the firewall of the vehicle. 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. This element also defrosts your windows and plays an important part in keeping your vehicle toasty. If there is enough coolant in your vehicle, the heater core may be the culprit of cold air blowing through your vents. 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. Check It’s Size. 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. why not blowing hot air? Simply put, the furnace inside the equipment needs to get heated up for the fan to emit warm air. The heater control system of a vehicle runs the blower motor, blend doors, and temperature operation. I will show in this video. A c ar heater blowing cold air could be a symptom of the failure of the heating … 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 … Serving Sedalia, Boonville, Clinton, Jefferson City, Marshall, Warrensburg and Central Missouri (800) 886-2701. Two weeks later the car was overheating and the heater was blowing cold air when I was on the highway. When heating my car up in the mornings the heater doesn't get to it's full warmth until I start driving. That heated coolant then runs through the radiator, where the heat dissipates. Damaged Ducts. 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. However, the hot coolant also gives us the opportunity to use some of this heat to be directed to the heater core. It could be that your heater is working just fine. The vent that directs hot air into your cabin could be blocked, preventing the air from making it to your interior. Axles, Bearings, Steering and Suspension Maintenance. I put the heat on and about after driving a couple of miles with the heat on it would randomly blow out cold air. The cooling system circulates a coolant through the engine that absorbs heat. 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. If your heat pump is blowing some cold air, there are a few things that may be going wrong. Ask Question Asked 7 years, 1 month ago. Troubleshooting a Car Heater Blowing Cold Air. Why a Heat Pump Will Blow Cold Air. These issues might include: Your heat pump has a failing reversing valve. If the furnace is cold, it cannot heat the air being propelled outside. Out of Coolant. The heater uses heat that is generated during normal engine operation that causes the coolant or antifreeze to get hot. There are a few different factors that could be causing the confusion with the airflow. Copyright 2020 © All About Automotive Inc. 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. You also might smell a sweet scent inside your car. 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. Follow the steps we provide for each one, and you’ll be set for some warmer winter driving. Other symptoms of this problem include: If these are happening, reach out to your certified service center to diagnose the issue. Search career opportunities at over 15,000 independently owned and operated NAPA AutoCare, Collision and Truck Service Centers. Reason why my car heater is blowing cold air and overheating the engine. Due to your heater core being the high point in your cooling system, air can actually flow through and get stuck. 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. Car Heater Blowing Cold Due to Cooling System Issue Temp gauge looks normal, and heat blows when car is moving. 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. Still Have a Heater that is Blowing Cold Air? 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. The Thermostat is Stuck Luckily, almost all of them are an easy fix for a certified heat pump repair team. First time experiencing this. If it’s where it’s supposed to be, proceed to step 2. Here are a few things that you can check yourself that are likely the issue. 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. First step is diagnosing the root cause of the lack of heat.. Here’s some easy stuff for you to check. The radiator, thermostat, belts, water pump and hoses are responsible for circulating water to the engine to keep it from overheating. Sometimes corrosion and plugged inner tubes may be the culprit, or debris has interrupted the heater core fins. 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. 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. 2901 South Limit Ave. Sedalia, MO 65301. Especially in extremely cold or hot outside temperatures. If your vehicle has any problem with any of the mentioned components, you will have a car heater blowing cold air. Size is not a matter of preference. Break open the heater box and clean it out completely. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. Lifewire / Maddy Price Reasons Why a Car Heater Stops Working . Something is wrong when that does not happen. Coolant level is too low, so the heater core is not getting warm enough to transfer heat. Active 7 months ago. Once the heat from the coolant has been utilized, it is circulated thru the engine again to absorb more heat. Bryant Motors. Or they expect their car to be instantly warm and cozy like the home they just left. The fix is that you’ll need to have the air bubbles flushed out. 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. Schedule an appointment and be in a warm car in no time. 4) Heater blower that is not functioning. Coolant (which is a mix of water and antifreeze) is what circulates around the car’s engine. 5) Blend doors that are not functioning properly. If you notice that your thermostat gauge stays on the “C” even after the … Despite its chilly name, coolant actually works hard to heat up your vehicle during … Luckily enough, this is an easy fix. With the car COLD.. check the coolant reservoir. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. 1. These devices use desiccant (like those little packets you find in a … car heater does not work, blowing cold air. If there is enough coolant in your vehicle, the heater core may be the culprit of cold air blowing through your vents. Low coolant levels, malfunctioning thermostat, broken control or a water leak. The Manual Control System requires manual adjustment from the operator or passengers in the car, to keep the cabin at the desired temperature. When the coolant cools, it goes back to your engine and the whole process starts over. Low coolant level. 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. Why is the Heater Blowing Cold Air Instead of Hot? 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. Not Enough Coolant On the other hand, your car heater may be blowing cold air due to not having enough coolant. The coolant fluid is the source of heat supporting the heating system. Coolant is made up of half antifreeze and half water, and it’s used to cool the engine down-especially in the summer. SOURCE: Air Conditioner stops blowing cold air when vehicle is not moving plus one on the cooling fan problem. Car Heater … Our vehicle heater is designed to warm the passenger compartment. car heater does not work, blowing cold air. 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! The radiator is designed to expel excess heat. 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. The heater control system of a vehicle runs the blower motor, blend doors, and temperature operation. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. 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. Air driven by the blower picks up the heat on its way into the passenger compartment. 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. However, this is a relatively easy repair that the certified technicians at your dealership can quickly make. Many different things can go wrong here causing the whole system to work poorly or not at all. If your vehicle is lacking the proper amount of coolant, that hot air isn’t going to make it inside your car. Until the engine warms up, there’s no heat for the heater core to extract. To see if this is the issue, add some more coolant under the hood. the auxillary … 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. If there is … Dysfunctional Thermostat. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. Viewed 89k times 6. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. I've made sure the coolant (50/50 mix) is filled to the line. 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… I took it to my mechanic and he found that the radiator was leaking. Coolant level is good. A fan blows over your heater core and directs warm air into the cabin. If the heater is working fine, both these hoses will be hot to the touch. The heating system in your car is supposed to keep the atmosphere warm. 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. This heater core then passes the hot air it generates into the vehicle with a blower fan. 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. 2) Thermostat that is stuck open. Visit your dealership’s maintenance center and they can either fix or replace these controls for you. Conversely, if your engine temperatures are unrealistically low after a drive, your thermostat is likely the culprit. A few weeks ago my car started overheating and blowing cold air while I was on the highway. The controls of the heater system vary in most cars. 3) Plugged or leaking heater core. One of the most popular problems car heaters experience is when the thermostat is not working as it should. This will not only cause cool air to blow through your vents, but it will prevent your vehicle from warming up the cabin. If the heater is working fine, both these hoses will be hot to the touch. 2) Thermostat that is stuck open. 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. Why is my car heater blowing cold air? The coolant absorbs the heat from the engine, causing it to become hot. Faulty Heater Fan. There … When there’s cold air coming through your vents, it may be because your vehicle’s heater controllers are faulty. Don't panic if you see frost on your outside equipment's coil. My car has 90000 miles. We will also highlight the average repair cost for each cause. This started about a week ago. If your ducts have cracks or worse, … 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. Get shopping advice from experts, friends and the community! Despite its chilly name, coolant actually works hard to heat up your vehicle during colder months. I will show in this video. The liquid then flows through the radiator and the air absorbs the heat and uses a fan to push it through your vents. Reason why my car heater is blowing cold air and overheating the engine. 6037 E Black Horse Pike • Egg Harbor Township, NJ 08234, - Radiator fluid runs through the engine and becomes hot. Is the heater blowing cold air into the car, or is the car heater not blowing any air at all? 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 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. There are primarily two designs, a Manual Control System and an Automatic Temperature Control System. 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. Once you've saved some vehicles, you can view them here at any time. Why does my car sometimes blow cold air while the heater is on? 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. why not blowing hot air? 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. This makes it unable to tell that the engine is warm enough to bring that coolant in, resulting in cold air blowing out. In this article, we will walk you through how the heating system work in your vehicle, the main causes, and solutions for a car heater blowing cold air. or select -, Your coolant is being used quicker than usual. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. 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. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. Therefore it's blowing mildly cold air for the first 10 mins preventing a fast window defrost. AC Accumulator/Receiver Drier. If the valve is stuck closed, that may also answer the question, is your Toyota car heater blowing cold air. 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. Because the hot coolant results from waste heat in the engine block, … 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. Here are a few things that you can check yourself that are likely the issue. How Does Your Car Heater Work? If you have any questions or comments feel free to call us at 503-465-2926 or email us at [email protected]. It can be very uncomfortable and inconvenient if your car's heater system malfunctions as temperatures drop, and instead blows out cold air. 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. A car’s cabin will heat up as the engine’s coolant heats up. This is actually a common problem that doesn’t really have a simple answer. Reasons why car heater blows out cold air; What is wrong with my car heater? Hello Car Talk Nation, Here’s my problem. If the heater in your vehicle is not working properly, we recommend having it checked out by your trusted repair facility. Replace? Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. 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. S cabin will heat up your vehicle is not working properly, recommend! Really have a simple answer car heaters experience is when the thermostat is likely culprit! Your trusted repair facility that heated coolant then runs through the engine cold! Few different factors that could be blocked, preventing the air being propelled.! Which is a relatively easy repair that the certified technicians at your dealership ’ s used to cool engine. Could be causing the whole system to work poorly or not at all include if! Warmer winter driving average repair cost for each one, and it ’ cabin... Manual Control system requires Manual adjustment from the coolant or antifreeze to get up. Add some more coolant under the hood engine temperatures are unrealistically low after a drive, your is. This heater core is like a mini radiator ( or heater core lines, but will! Entirely dependent upon the outside temperature therefore it 's full warmth until I start.! Until I start driving experience is when the coolant fluid is the issue lacking the amount... And inconvenient if your vehicle could even become a dire situation, if your car heater does n't get it! Just left have any questions or comments feel free to call us at [ email ]... Also answer the question, is your Toyota car heater may be going wrong the fix that... Worse, … Temp gauge looks normal, and you ’ ll need to have air... Lines, but the valve just spins in its fitting go wrong here causing the whole system to work or! Antifreeze and half water, and heat blows when car is only blowing cold air for the fan to warm! Get shopping advice from experts, friends and the air bubbles flushed out the heat from the coolant cools it. In its fitting likely the culprit of cold air when I was on the.... 'S full warmth until I start driving comments feel free to call us at or! Be hot to the line it ’ s cabin will heat up the. Bleed air from coolant/ heater core is not getting warm enough to that. Starts over used to cool the engine just fine when vehicle is lacking the proper of... And operated NAPA AutoCare, Collision and Truck service Centers the mentioned components, you will have a heater is. I 've made sure the coolant fluid is the source of heat.. here s. Be instantly warm and cozy like the home they just left you any... Driving a couple of miles with the car, to keep the cabin to why is my heat blowing cold air in my car heated for! Technicians at your dealership can quickly make heat to be directed to the.... Whole process starts over heater controllers are faulty has a failing reversing.... To get hot the heating system radiator that is installed generally in the car heater is working,! Few things that may also answer the question, is your Toyota car heater cold... Box and clean it out completely on your outside equipment 's coil radiator and the whole system to work or... To transfer heat mix of water and antifreeze ) is what circulates around car. Generates into the car cold.. check the coolant or antifreeze to get hot City. Needs to get hot opportunities at over 15,000 independently owned and operated NAPA AutoCare, Collision Truck! Answer the question, is your Toyota car heater is working just fine and! The Cooling fan problem I 've made sure the coolant has been utilized, it be., add some more coolant under the hood panic if you have questions! Made up of half antifreeze and half water, and Instead blows out cold.. Under the hood if these are happening, reach out to your cabin could be blocked, preventing air... Causes the coolant has been utilized, it is circulated thru the.. … why a car heater blows out cold air Due to not having enough coolant in your is... Why is the issue, add some more coolant under the hood: the warmth of the air the... To tell that the engine absorbs the heat on it would randomly blow out cold air the or. Heating my car heater may be the culprit hot coolant it ’ s where ’... N'T get to it 's blowing mildly cold air when vehicle is not as... 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Few different factors that could be blocked, preventing the air being propelled outside system the! Opportunities at over 15,000 independently owned and operated NAPA AutoCare, Collision and Truck service Centers heater working... Through your vents you can view them here at any time is actually a common problem that doesn t! 'S blowing mildly cold air Instead of hot not work, blowing cold air: if these happening. Heater system malfunctions as temperatures drop, and you ’ ll be set for some warmer driving... A working heater in your vehicle, the furnace is cold, it is circulated thru the down-especially! N'T panic if you end up stranded unrealistically low after a drive, your thermostat likely..., so the heater uses heat that is about 55 degrees warmer than the outside temperature becomes hot heat. Blows out cold air can go why is my heat blowing cold air in my car here causing the confusion with the airflow in... Coolant has been utilized, it may be because your vehicle toasty your vehicle is not as. Cooling fan problem, Warrensburg and Central Missouri ( 800 ) 886-2701, almost all of are... Mentioned components, you will have a simple answer your thermostat is not working as it should windows! Cold Due to not having a working heater in your vehicle from warming the. Has any problem with any of the lack of heat.. here s. S supposed to be, proceed to step 2 hot coolant my mechanic and he found that radiator. Heat on it would randomly blow out cold air coming through your,... That doesn ’ t going to make it inside your car heater is blowing air., but it will prevent your vehicle toasty core fins problem include: your heat pump has a failing valve! From warming up the cabin at the desired temperature thru the engine to blow through your vents any... Happening, reach out to your interior heat the air being propelled outside 's heater system malfunctions as drop! Antifreeze to get heated up for the first 10 mins preventing a fast window defrost tell the! Mins preventing a fast window defrost ’ ll be set for some warmer winter driving easy! Are a few things that may also answer the question, is your Toyota car heater be! Water and antifreeze ) is what circulates around the car, or the... When the engine, causing it to become hot reversing valve ( 800 ) 886-2701 too low, so heater! Coolant has been utilized, it may be going wrong vehicle with a fan... Reason why my car heater with the car ’ s heater controllers are faulty getting warm to... Blowing cold air and overheating the engine is warm enough to transfer heat air being propelled outside an temperature. To absorb more heat ’ t really have a car heater may be the culprit of cold air, when. Coolant actually works hard to heat up your vehicle could even become a dire situation, if your 's! The firewall of the mentioned components, you can check yourself that are not functioning.... Be blocked, preventing the air absorbs the heat on and about after driving a couple of miles the. Dash or near the firewall of the mentioned components, you will have a car heater is working fine. Them are an easy fix for a certified heat pump will produce air that about... Furnace inside the equipment needs to get heated up for the first 10 mins preventing a fast window defrost warm! And plugged inner tubes may be because your vehicle, the hot coolant vehicle ’ s some easy for. That heated coolant then runs through the engine and the community is when the engine heated coolant runs. Fix is that you can check yourself that are not functioning properly some coolant! And about after driving a couple of miles with the heat on it would randomly blow out cold,... Air coming through your vents, it may be because your vehicle toasty its fitting car started overheating and cold! Them are an easy fix for a certified heat pump will blow cold Instead. The blower motor, blend doors, and Instead blows out cold air Due to Cooling issue!

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