000569, Member of Tokyo Chamber of Commerce Boueki - 201650, Car Heater Blowing Cold Air? If that’s the case, then the air bubbles have to be flushed out to fix the problem. When it does, it messes up the normal operation of the heater. And you wait — and wait — but the heater just blows cold air. i checked all fluids … Something is wrong when that does not happen. The Best TOAD Vehicles for Frequent Campers. Finally, a heater core can become plugged in more than one way. You will get only hot air all the time if it is fixed in the ‘open’ position. The coolant in the system is supposed to flow through the core. Since the heater core is often the high point in a cooling system, air can move into it and become trapped. In order to allow the engine to warm up, they stay closed until the coolant in the engine reaches a given temperature range. Heater Blowing Cold Air? First off, everything here applies to vehicles with water-cooled engines. 2001 chevy impala 3.4L. However, the component that is likely to give trouble is a stuck bend door. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Universal Replacement Car Heaters That Work, Finding a Cheap Fix for a Broken Defroster, Using a Space Heater as an Electric Car Heater, The 10 Best Portable Electric Car Heaters of 2021, How to Fix Sweet, Mildewy, and Burning Smells From Your Car Heater, Car Engine Block Heater: Unsung Hero of the Frozen North. It has an aluminum or brass tube system that brings in and out hot coolant. When a thermostat gets stuck to the ‘open’ position, the engine takes a much longer time to warm up. Hot coolant from the engine passes through a heater core, which looks and functions a lot like a small radiator, and a blower motor forces air through it. Otherwise, the coolant does not circulate properly and the engine overheats. If you’re wondering, is your Toyota car heater blowing cold air, here are some other issues that you will want to watch for: (And how to fix it) | Haynes … So, when you face the trouble of a car heater blowing cold air, examine either the heater core or the bend door. Thermostat seems fine, car stays at constant 210 even when running for 30 minutes. The heating system could blow cold air if that valve is stuck in the ‘close’ position. When you climb into your car on a freezing day, the first thing you do is turn up the heater. This is the reason that it takes a while for heaters to start There could be various reasons for car heater not working but it basically happens for two reasons: air from the blower is not blow toward the heater core or the coolant does not flow through the heater core. Reasons Why Your Car Heater Isn’t Blowing Hot Air - Completely … The trouble with the thermostat or heater core could also be the reason. How To Reset Check Engine Light: Follow These 4 Easy Ways! When a blend door gets stuck, it doesn’t matter if the heater core is working perfectly fine. First time experiencing this. However, the fins of a heater core can also get clogged up with lint, pine needles, and other detritus that manages to get into the heater box. 10 Best Tire Companies In The World [Updated In 2021]. If your car heater will not blow hot air, make sure you get it fixed right away. A blend door can also get stuck because of mechanical linkage or a vacuum line coming off, a switch going bad, or a number of other reasons. In some cars, the heater core has a valve in its inlet line. I have fluahed heater core, checked all hoses, coolant and checked the actuator and they are all good. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. Plugged heater cores can also cause a car’s heater to blow cold. However, the issue could be rooted in some other components too. When you hear about a plugged heater core, what that usually means is that corrosion and other junk has clogged up the internal tubes, and flushing will often clear it up. | Blog | … It could be due to a detached vacuum line, a breach in a mechanical linkage, or a bad switch. If you’re a driver near Mobile, Prichard, and Saraland currently stuck out in the cold, stop by Nissan of Mobile or go online to schedule a service appointment today! The best way to check for this is a non-contact thermometer, which will allow you to check if coolant is flowing through the heater core or not. It is that time of year when one of the most important things to you is probably Y my car blow hot air and cold air at the same time - Answered by a verified Mercedes Mechanic We use cookies to give you the best possible experience on our website. Coolant not flowing through the heater core. It will happen even if the heater core is functioning. I've made sure the coolant (50/50 mix) is filled to the line. The heating system in your car is supposed to keep the atmosphere warm. You can solve this issue by flushing the air out of the system. if it help my top hose is hot while my bottom hose is cold also my radiator cap be cold when the car is over heating. Your email address will not be published. By Stephen Fogel. It’s freezing outside, and all you want is to get in your car and turn on the heat. The air is then heated by the coolant and then, in turn, warms up the interior of the vehicle. A simple fix to the problem is flushing the core. Get the Latest Tech News Delivered Every Day, Lifewire uses cookies to provide you with a great user experience and for our, Tuomo Vainamo / Folio Images / Getty Images, Quick Crash Course in Car Heater Operation, Car Heater Blowing Cold Due to Cooling System Issue, How to Fix It When Your Car Heater Isn't Working. Another reason for the heater not doing its work properly. When the heater blows slightly warm instead of cold air, a thermostat with stuck open valves is to be blamed for. Either coolant isn’t flowing through your heater core, or air from the blower motor isn’t being directed through your heater core. Tsukasa Azuma is an awesome car blogger of Car From Japan. The specifics will vary quite a deal from one vehicle to another, but most systems have some kind of blend door that changes how air flows or doesn’t flow, through the heater core. If you recently found yourself asking, “why is my car heater blowing cold air?” we hope this gives you some insight on how to fix this common issue. If you suspect that you’re dealing with a blend door issue, the specific diagnostic procedure will depend on how your vehicle’s heating system is set up. Station that runs the heating system all you want is to get in your car and on. Machine has several valves that open and close depending on the heat in! 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