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, How to Fix It When a PS5 Won't Take, Read, or Eject a Disc, 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 the vehicle has a valve in one of the hoses, check its operation. Step 1. Even if every other part of your car’s heating system works properly, you won’t feel any warm air if the fan doesn’t work. The air conditioner … 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. Radiator. Cutlass Supreme. Reconnect the electrical connector and you’re car heater blower motor is back in business. Any ideas? Dysfunctional Thermostat. 6 Replies. The fan inside your car then blows heat off of it to give the cabin heat. In other cases, it may be a simple problem, such as a broken wire, rusted connections, or a disconnected pigtail assembly. no it does not. I have a 2000 Honda civic ex. CarTalk.com Best of Deals Car Reviews Repair Shops Cars A-Z Radio Show. Checking a heater fan circuit. Cabin air filters serve as a filter to the outside air coming into your car to make sure it … If the valve is stuck and prevents coolant from flowing through the heater core, that may be the source of the problem. The heater in my 2000 Ford Taurus just quit working. The safest way to do this is with a non-contact infrared thermometer. Observe safety precautions while working with electricity. When it comes to broken heaters, there are several common problems that could be the culprit. Can you help? Solution: This can be as simple as a blown fuse, or it could be more involved. LiveAbout uses cookies to provide you with a great user experience. However, attempting this without all of the info you need, destines your electrical troubleshooting process to failure. Your truck’s heating system consists of many different parts, and if even one of those parts is damaged, you can end up with cold air coming out of your vents. Here are 12 common problems, or steps to go through, in order to troubleshoot the car defroster properly. As did the author of this letter, you want your fan back. 1987. You've turned the key on. I was out, went back to the car and the fan just would not work turn on, no matter the speed selected. I checked the fuses and they are all fine. For example, a heater that does not work at all could be suffering from a broken blower motor or switch, while a heater that emits chilly air could be affected by low coolant or a clogged up heater core. Turn off the vehicle and let the engine cool completely. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. Radiator fluid runs through the engine and becomes hot. I just have to find the blower relay and its fuse. The blower fan located behind the dashboard pushes air through the climate control vents. We’ve put together a quick explanation of each of these problems. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. Check for power at the motor itself. This heater core then passes the hot air it generates into the vehicle with a blower fan. It will still work with no fan, and you'll usually still be able to control the temperature of the air that is blowing or trickling, out. To fix any blower, the first things to look at are the fuses, relays, and electrical connections. How strange… it wasn’t working for two days and magically it worked today. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as fuses and relays. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. Ac/heat blower fan not working, randomly turns on and off. Here are 5 common problems that may be ailing your car’s radiator fan, making it defunct or inefficient: 1. 7 Possible Causes, Troubleshooting a No Spark Problem in Honda Accord. Yes. Yes, this car heater does require a 120V AC power input, but that is to be expected with a car heater outputting this much power. happy new year! But a climate control system with no fan to push the air around is anything but controlled. To make it clear the fan I'm talking about is the ventilation fan inside the car and NOT the radiator fan under the bonnet. Oldsmobile. The car heaters we recommend in this guide have all … The coolant absorbs the heat from the engine, causing it to become hot. From there, the water circulates back to the starting point so it can flow through the system again. Disconnect the electrical connector. Learn about them all below, and turn to the pros at Subaru Superstore of Surprise when your car's HVAC system is on the fritz. Her expertise includes social media, web development, and graphic design. Car Heater Not Blowing Hot Air: A Bad Blower Fan Motor. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it has cooled down again. Check the heater core temperature. It is possible that a wire has worn out due to heat and needs replacement. With luck, any issues you have will become evident in warmer months, so you can fix them before winter sets in. The Haynes manual says the blower is activated by a relay. If the fan does not turn on at all when the air conditioner or heater is running, it is usually not the fan itself but the resistor. Perhaps your temperature gauge is running below normal. I need to find the location of this front blower relay and the fuse that powers it. A damaged radiator can leak and prevent coolant from reaching the heater core. He also ghostwrites articles for numerous major trade publications. Another reason why your car AC fan is not working could be due to your cabin air filter. A defective switch could let the fan run continuously, reducing the coolant temperature to the point where you can’t get enough heat into the interior. check the fan connector under the dash. No. Most cars today have an electric fan that comes on the engine gets too hot. On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. i pulled the fuse and it looks like all the others (not blown) is there a relay on this circuit and if so is it ok to pull it and check it or would that destroy it? Maintenance/Repairs. If the coolant level is low, the vehicle likely isn't circulating enough antifreeze through the heater core and needs to be replenished. 2. Since the blower resistor is directly responsible for transferring power from the battery to the blower itself, a symptom of defective blower motor resistor is that no air flows out of the vehicle’s air vent. This coolant is then routed through a “mini” radiator called a heater core. To determine the cause of a blower fan failure, isolate the motor, and perform some basic electrical tests. Heater control valve When you set the temperature to hot, air being passed over the heater matrix should be ducted into the cabin. At the simplest level, there are two main reasons why the heater is not working. If the heater isn't blowing any air, skip to the next section. A heater core is responsible for a vehicle’s defrosting and heating actions. The coolant needs to be flushed and replaced. If it receives power, check if the blower motor is burned out. 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