why is my heat blowing cold air in my car

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

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