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