According to the Popular Mechanics website, a common cause of a car's heater not working is a buildup in the heater core. The coolant is housed in a translucent plastic jug in the engine compartment. If the coolant level is low, the vehicle likely isn't circulating enough antifreeze through the heater core and needs to be replenished. There are many reasons why a car heater is not working. Update on the issue. If the blower doesn't receive power, check the blower fuse to make sure it's not blown. IMPORTANT NOTICE: We will be closed for the holidays on December 25. Grime or other sediment accumulate in the core and restrict the flow of heated coolant that serves as the source for the … Coolant that is a dark brown color indicates that there is rust in the cooling system. A faulty or broken thermostat is the most common cause of your car’s failing heat. You can easily understand this issue. Dysfunctional Thermostat. Fix this issue by your reliable mechanic. Well, when I say cool, I mean keep to an optimum temperature, around 80 to 90 degrees. 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. Or not if your car heaters are not working. If your coolant level is low, it could keep your heater core from getting enough coolant to produce heat. Instead, you might have a failed thermostat, which opens and closes circuits in the cooling system as the engine heats up. Check the heater core temperature. Turn off the vehicle and let the engine cool completely. Once the engine is up to temperature the thermostat opens and the coolant flows around the whole system. How Does a Car Heater Work? Best answer for Why Does My Air And Heat In My Car Only Work Sometimes. When a car’s heater is not working in the middle of winter, it can make your daily commute miserable and cold. A thermostat prevents the coolant from flowing until the motor gets warm enough. Please advise. It's no fun getting into your car on a frosty winter's morning only to find the car heater not blowing hot air. To do this, set the heater controls in the car to maximum heat, remove the radiator cap (or remote mounted coolant pressure cap, sometimes on the overflow tank) and fill to the correct level. The fan inside your car then blows heat off of it to give the cabin heat. Why is the Heater Not Working? 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. Step 1 - A heater cannot operate unless the engine is full of coolant/antifreeze. If the valve is stuck and prevents coolant from flowing through the heater core, that may be the source of the problem. About Car Heater Fans. A car heater that isn't working could be caused by several simple issues. Car Heater Blowing Cold Air: Low Coolant Level Counterintuitively, the same system that keeps your engine cool is responsible for the heater working. Not sure if the new radiator had anything to do with it or not. The heated air circulated through vents into car interiors is directed by the heater fan. 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. 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. When it does happen, you're left with a miserably underpowered heat or AC system. 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. And more often than not, the problem is that your furnace is just plain dirty: Check the coolant level. If the coolant level is low due to a leak, have a mechanic find it and fix it. Is There a Cheaper Alternative to Air Conditioning? 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. A vehicle thermostat regulates the coolant temperature in the engine. However, low coolant often indicates another problem, such as a leaking gasket or hose. 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. It doesn't move up or down. I think since the system had a flush, there were some air pockets that did not get filled in the system. 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