This blog post will give you a good idea of what might be causing the problem with your car heater. When you crank up the heat in your cabin, the heater core captures heat from the coolant and transfers it into the cabin in the form of warm air. Christine Baker is a marketing consultant with experience working for a variety of clients. If it receives power, check if the blower motor is burned out. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known. Check if the blower motor … Fixing this can be as simple as a fluid flush. Not Working. © 2021 Firestone Complete Auto Care. If it's not blowing hot air check the following: Coolant/air lock What to do if your car heater is blowing cold air. Posted on: January 24, 2017 by: Scott Geller. It is also important to know that newer cars may not need to be serviced until they reach between 60,000 and 100,000 miles; if your car won’t blow hot air and you have a newer car, it is vital that you take it into a mechanic as there may be another cause. Plus, many of the same issues that prevent your car’s heater from blowing hot air can also lead to engine overheating and decreases in performance! my ac,heater,defroster.andblower moter do not work. Should I Inflate My Tires in Cold Weather? Save time in the store by booking your appointment online. The safest way to do this is with a non-contact infrared thermometer. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. 2) Thermostat that is stuck open. BECOME A MEMBER. Unknown December 1, 2014 at 3:44 PM. Home Blog What to do if your car heater is blowing cold air. Luckily, swapping out a hot surface ignitor is easy. I had no heater on transit connect. Either the blower isn't working, in which case you may get warm air but not much of it, or it is blowing air but it may not be very hot. Heater not working 3 Answers. It has been so cold this winter that I notice it more. Blower Fan. Yikes! 4 Answers. Each of these problems has its own level of gravity thus … only put in straight antifreeze, do not mix. Regardless, if you can barely hear or feel a breeze when your car heater is running, issues with the blower fan may be to blame! Sign up with Facebook. There are any number of reasons cold air or no air is coming through the vents. If the valve is stuck and prevents coolant from flowing through the heater core, that may be the source of the problem. check antifreeze fluid level. Get a professional opinion on what’s causing your car heater to malfunction and which services and repairs can help fix it at your nearest Firestone Complete Auto Care. If cold air is coming out of the heating vents, even when the vehicle is warmed up and the thermostat is set to hot, you could be dealing with one of the following problems: If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. Climate Control. 4 Things That Can Happen When You Drive With Worn Brakes, New Brakes Squeaking? Those fans should kick on when you turn your air conditioning on to keep enough air moving through the condenser while you’re stopped. Why is my Car Heater not blowing out hot air when on full just slightly warm? But after a few minutes, you notice it still isn’t blowing hot air! Do I need a new thermostat? Heater core flushed easily with no sign of it being dirty. WHY MY CAR HEATER DOES NOT BLOW HOT WARM AIR. Turn off the power to your furnace (by hitting the switch, pulling the plug, or tripping the breaker). With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed. Car Battery Problems: When is it Time for a New Battery? By using Lifewire, you accept our, How to Fix It When Your Car Heater Isn't Working, How to Fix It If Your Car Heater Isn't Blowing Any Air, Universal Replacement Car Heaters That Work, Using a Space Heater as an Electric Car Heater. Can you adjust the speeds on the blower? Some units have more than one cover panel, so just keep removing panels until you find it. Engine coolant contains a precise mixture of antifreeze and water, which helps keep your engine from overheating or freezing. Save on tires, brakes, batteries, oil changes and more. What gives? Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. To warm your cold inside air, the heat pump’s outdoor unit uses liquid refrigerant to absorb heat from the outside air. What You Should Know, What Are Brake Shoes & How Are They Different From Pads, How to Know When to Replace Your Car Battery, Why Advanced Driver-Assistance Systems Require Special Alignment. When stuck open, the thermostat may allow too much coolant to flow, preventing your car from reaching its optimum operating temperature, thereby causing a decrease in performance. The heater core looks (and works) similar to your car’s radiator — it’s made up of a series of narrow tubes and fins. If the blower doesn't receive power, check the blower fuse to make sure it's not blown. First thing to check is your coolant level. Sun or Snow: Are All-Weather Tires Right for You? If the holdup is by the heater core, then that’s one reason why hot air isn’t blowing. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. Follow these steps to fix the problem. Have checked the fuse's and relay's nothing wrong there. Why would my heater blow out cool air when sitting still and then hot air when going down the road and then it's not all that hot Try flushing or blowing high pressure air through the heater core lines. Alec. Refill the cooling system with a 50/50 mix of anitfreeze and water. Here’s What It Could Mean 7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air. At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. LOG IN. my 2004 volvo,s40 1.9 with turbo. Replies. Speak of the devil! The first is a blockage anywhere in the series of tubes in the condenser. Many stores are open late and on weekends. Reasons Why Your Car Heater Isn’t Blowing Hot Air. My car heater gets warm but not as hot as it should when it is cold outside. And Other Race Day FAQs, Supporting the Fight: How Bridgestone and Firestone Are Helping in the Battle Against COVID-19, Make a Pit Stop at Our New Car Care Centers. So why is blowing warm air inside the car? Is the heater blowing cold air into the car, or is the car heater not blowing any air at all? Why Doesn't the 12v Socket in My Car Work? OR. I agree to the user agreement. Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air. Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air. Home Heater Blowing Cold Air? Learn what’s keeping you from enjoying your car’s warm air and what you can do about it. He also ghostwrites articles for numerous major trade publications. Sonata. What Happens If You Put Your Car in Reverse While Driving? If the heater isn't blowing any air, skip to the next section. I have a vauxhall corsa, my heater on the car even when its been running for a while it never seems to blow out hot air, at best just a slightly warm air, ive changed the termostat over as i thought this was the problem but doesnt seem to of helped. November 29, 2017 at 5:37 PM. In December of 2015 (car was 4 years old) my heat stopped working well, and when the weather got colder I noticed that the heat was not blowing warm air on the passenger's side. Share. Heater cores are typically situated directly in the back of dashboards. Reply Delete. I flushed the heater core and know it's not plugged. If you determine that hot antifreeze flows through the heater core, there may be debris in the heater box. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. Find the best tires that match your needs. What Is An Engine Oil Additive and Is It Worth It? Any ideas to what might be causing this, if so what parts will need to be replaced/repaired? Already Tried: I haven't had the car checked yet. NOT A MEMBER? Your car’s thermostat is a valve that opens and shuts to regulate the coolant flow to the engine and radiator. Remember me. The coolant is housed in a translucent plastic jug in the engine compartment. I also have noticed that my car tends to almost overheat during the summer when I am in traffic but it has never actually overheated. If one hose is the same temperature as the coolant and the other hose is cold, there may be a blockage in the heater core. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. A cold winter day is no time to find out your car heater isn’t working. The specific diagnostic procedure varies depending on the vehicle. They said heater core and $1400 dollars later the heat works great. If the vehicle has a valve in one of the hoses, check its operation. The heater core’s maze-like network of tubes is susceptible to clogging and leaks, reducing the coolant level or flow through your engine’s cooling system. Coolant that is a dark brown color indicates that there is rust in the cooling system. Here are some reasons this could be happening. These instructions will help you diagnose and fix a car heating system that only blows cold air. If not then you can possibly have a stuck thermostat, water pump not working, heater core is leaking or your blend door actuator that is mounted onto the side of you HVAC housing isn't working or the blend door itself. HEATER BLOW COLDIn this video we will explain the reasons why your car heater might blow cold air. Checked the anti freeze level, the actuators for the blend door etc , and flushed the heater core a couple of times. Finding a Cheap Fix for a Broken Defroster, How to Fix Sweet, Mildewy, and Burning Smells From Your Car Heater, The 10 Best Portable Electric Car Heaters of 2021, What to Do When the Gauges in Your Car Aren't Working. If the thermostat opens too soon, or fails to close the heater core will not reach max temperature, and the air from the heater air will be warm,not hot. It’s hard to enjoy the ride when your teeth are chattering! To find out what's wrong with your car's heating system and what you can do to fix it, you first need a basic read of the situation. 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