I think since the system had a flush, there were some air pockets that did not get filled in the system. Why Does My Car Have No Heat? If it receives power, check if the blower motor is burned out. 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 it receives power, check if the blower motor is burned out, If the blower doesn't receive power, check the blower fuse to make sure it's not blown. If you follow all the steps below and your heat is still not working, then you will probably need to hire an HVAC contractor or furnace repair technician near you to come out and repair your heating system.. If your coolant level is low, it could keep your heater core from getting enough coolant to produce heat. The heater in your car is able to blow hot air into the cabin because of a part called a heater core. When your vehicle’s engine has cooled down, open the radiator cap and check the level of coolant. Switch the thermostat from hot to cold and listen. 2. 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. For the cold engine to warm up quickly, it is fitted with a thermostat. I found in the end, the dealership just did not add enough coolant. A car heater that isn't working could be caused by several simple issues. 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. Check the coolant level. If the coolant level is low, the vehicle likely isn't circulating enough antifreeze through the heater core and needs to be replenished. If the original fuse is not blown, trace the problem back to the source by testing the resistor, relay, and switch. Is There a Cheaper Alternative to Air Conditioning? Step 1 - A heater cannot operate unless the engine is full of coolant/antifreeze. 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. After removing the blower, you may find that the squirrel cage is clogged with so much debris that the motor can't operate. He also ghostwrites articles for numerous major trade publications. Another likely cause of a car that runs OK, but has no heat is a stuck thermostat. There are some common reasons can occur this. Reasons Your Car Won't Heat | Heater Stopped Working Heat in automobiles is supplied by hot coolant circulating through the engine. Read on to see how your car's heater, the heater core and engine cooling system work, see if the car heater will work without a thermostat and find out how to fix it. Watch for the coolant level to drop as the thermostat opens. Rubber hoses carry the coolant from the motor to the radiator, and also to the heater core, which is basically a smaller radiator under the dashboard. 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. Filling the coolant may fix the problem in the short term. Lack of maintenance is probably our #1 source of service calls during the winter. One of the most common problems with an automotive climate control system is a lack of blower pressure or no blower at all. That sounds a little odd right? Then warm up your vehicle and see if the defroster starts working better. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. So, a problem with the vehicle's cooling system might also cause the heater to underperform or stop working. If the vehicle burns coolant, it may have a blown head gasket, which can be costly to fix. Best answer for Why Does My Air And Heat In My Car Only Work Sometimes. It should have level indicators that show how full or empty it is. 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. However, low coolant often indicates another problem, such as a leaking gasket or hose. However, I wasn't getting any heat out of the heater. Trying to work out why your car heater isn't working and why the car heater is blowing cold air when it should be hot? Update on the issue. 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. By continuing to use this site you consent to the use of cookies on your device as described … Why do i only have heat on one side of my car - Answered by a verified Auto Mechanic We use cookies to give you the best possible experience on our website. 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: Such as blower fuse cut off or relay or damage of blower motor. 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. Grime or other sediment accumulate in the core and restrict the flow of heated coolant that serves as the source for the … If your car has not been overheating or running hot, your water pump is not the culprit. 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. If a thermostat is stuck in the closed position, it will never allow coolant to circulate fully, so no heat for you. It's the most likely reason your heat won't turn on. All Digital manuals are available instantly after purchase! That means a trickle out of your vents instead of the rush you asked for. Have you checked for a leak in the radiator? Lack of maintenance. Even if you live in Florida, Texas or California, these days you need your car's defroster to work properly to fight those early morning chills, and if you live up north a working heater can be a matter of life or death. If it is stuck, it may be allowing the coolant to always be run through the radiator, which keeps it too cool to allow for heat in … Or not if your car heaters are not working. Christine Baker is a marketing consultant with experience working for a variety of clients. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. The heated air circulated through vents into car interiors is directed by the heater fan. When a car heater doesn't work, the most common cause is low coolant. Car Heater Blowing Cold Due to Cooling System Issue Check the heater core temperature. Ken Mattson, owner of Len’s Automotive in Bellevue, Wash., says a car heater can stop working for a number of reasons, including: • A low antifreeze/water level in the radiator due to a leak in the cooling system. My 2013 Ford Edge is blowing heat on the passenger side and cold air on the drivers side. Blower Fan is not working: If your car blower fan is inactive or damaged, car heater will work but warm air will not reach inside of your car. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. Why is the Heater Not Working? According to the Popular Mechanics website, a common cause of a car's heater not working is a buildup in the heater core. And more often than not, the problem is that your furnace is just plain dirty: The cooling system on modern cars is fairly straightforward. A car heater that isn't working could be caused by several simple issues. Vehicle has dual heat/ac. There are many reasons why a car heater is not working. Until the engine warms up, there’s no heat for the heater core to extract. The specific diagnostic procedure varies depending on the vehicle. The first thing to be affected will be the heater core — since it is higher than the engine, there might not be enough coolant to reach it. When you regulate the thermostat from hot to cold and don't hear the blend door moving, there may be a problem with the blend door, linkage, wiring, or the thermostat switch, depending on the vehicle. This is why, once your car warms up, the temperature gauge should remain relatively static. I ended up adding an entire gallon of coolant over 2 days. I replaced my car ECU and noticed the temperature guage stopped working. Now start the engine without replacing the cap and idle for a few minutes. If your heat is not working, the first thing to do is figure out why. When it does happen, you're left with a miserably underpowered heat or AC system. It's no fun getting into your car on a frosty winter's morning only to find the car heater not blowing hot air. The radiator uses the outside air and a fan to cool the fluid in the system, while the heater core uses the heat from the coolant and a fan to warm the air inside the car. If the coolant level is low due to a leak, have a mechanic find it and fix it. 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. 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. • A blower fan that isn’t working properly. Had heater core flushed and now it's providing lukewarm heat but still not like what it should provide. Dysfunctional Thermostat. Check coolant levels by inspecting: 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. You can easily understand this issue. Beginner’s guide: what is a four stroke engine and how does It work? If coolant level is low check the system for leaks. Perhaps your temperature gauge is running below normal. Lift the hood and check the temperature around where the heater core hoses enter the heater core box. Now, if the upper radiator hose is hot but the lower hose and the heater hoses are cold then try a new thermostat and see if the issue is repaired or not. Dan Ferrell (author) on November 25, 2019: It's not safe to drive without a temperature gauge, but you may want to try an aftermarket solution in the meantime, so you can keep an eye on the temperature. Orders for printed manuals placed on or after December 24 will be shipped when we reopen on January 4th, 2021. Maybe the fan is malfunctioning. Solution: When the engine and radiator are cool, top up the coolant. If the vehicle has a valve in one of the hoses, check its operation. A different reason for the heat to not work would be a lack of coolant going through the engine. A small amount of hot coolant is diverted into a hose fitted into the firewall and then into a small heat exchanger or heater core. About Car Heater Fans. 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