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