Get the Latest Tech News Delivered Every Day, 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. Reasons Why a Car Heater Stops Working There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. There are a few potential culprits for why your car engine coolant may not be heating up: Fixes: The only way to fix a faulty thermostat or temperature sender is to replace it. The heater in your car is able to blow hot air into the cabin because of a part called a heater core. Lack of maintenance. In the heating system in the passenger compartment of your car cold and is blowing via a fan over the heater core to warm the air. When a car heater doesn't work, the most common cause is low coolant. There are some common reasons can occur this. I think since the system had a flush, there were some air pockets that did not get filled in the system. Once the engine is up to temperature the thermostat opens and the coolant flows around the whole system. After removing the blower, you may find that the squirrel cage is clogged with so much debris that the motor can't operate. A blown fuse often indicates a different underlying problem, so never replace one with a larger fuse to prevent it from blowing out again. If the vehicle burns coolant, it may have a blown head gasket, which can be costly to fix. Had heater core flushed and now it's providing lukewarm heat but still not like what it should provide. • A bad thermostat that isn’t allowing the engine to properly warm up. When it does happen, you're left with a miserably underpowered heat or AC system. Why is the Heater Not Working? You can easily understand this issue. Until the engine warms up, there’s no heat for the heater core to extract. Orders for printed manuals placed on or after December 24 will be shipped when we reopen on January 4th, 2021. If the temperature gauge isn't moving much from the lowest reading, or the car runs poorly for more than a few minutes on a cold day, the cooling system may not be working properly. Using a Space Heater as an Electric Car Heater, 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 2020, What to Do When the Gauges in Your Car Aren't Working, How to Fix It When a PS5 Won't Take, Read, or Eject a Disc. They work by using the heat in the coolant system that circulates around the car's engine to cool it. Another likely cause of a car that runs OK, but has no heat is a stuck thermostat. If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. Is There a Cheaper Alternative to Air Conditioning? Before we dive into the details on what can cause a car heater to not blow hot air out we first need to understand how a car heater works. If the thermostat is “stuck” it can close off all coolant to the engine…thus overheating and no heater heat will result. Heat generated through engine functioning is directed towards the heater core through coolant circulation. 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. If you replace a blown fuse with one of the same amperage and it doesn't go out, then the fuse likely failed due to age. The coolant is forced around the passages by a water pump. If the valve is stuck and prevents coolant from flowing through the heater core, that may be the source of the problem. Here are a few of the more common reasons that’s causing the car heater to not work properly: The amount of coolant in the system is too low. For the cold engine to warm up quickly, it is fitted with a thermostat. Or not if your car heaters are not working. If the vehicle has a valve in one of the hoses, check its operation. One of the most common problems with an automotive climate control system is a lack of blower pressure or no blower at all. If the original fuse is not blown, trace the problem back to the source by testing the resistor, relay, and switch. By continuing to use this site you consent to the use of cookies on your device as described … 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. If the coolant is low, or there is an air lock (and also after replacing any faulty parts) you need to fill the system properly. Here is what to check if your heater or defroster isn't working: Emergency winter supplies to keep in your car, Why winter tires are important even when it’s not snowy, Prepping Your Car For Winter Cold, Rain and Snow, Haynes shows you how on YouTube: Nissan Sentra, The best car videos on YouTube from Haynes. It's the most likely reason your heat won't turn on. So, a problem with the vehicle's cooling system might also cause the heater to underperform or stop working. Turn off the vehicle and let the engine cool completely. Perhaps your temperature gauge is running below normal. My 2013 Ford Edge is blowing heat on the passenger side and cold air on the drivers side. On top of that, if there’s no heat in the vehicle, it has no way to defrost the windows and mirrors to eliminate condensation and ice. • A blower fan that isn’t working properly. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. 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