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 heater isn't blowing hot air at you when you turn the system on, the blower fan might have a problem. This heater core then passes the hot air it generates into the vehicle with a blower fan. Reconnect the electrical connector and you’re car heater blower motor is back in business. If not, you need the fan serviced. Required Tools for this Project. A heater core is made up of brass or aluminum tubing that carries the hot coolant in and out, along with fans that disperse the heat released by the coolant. I have a 2000 Honda civic ex. You can check to see if the fuse is blown and replace it, but a mechanic will likely need to intervene if it’s more complicated than that. I was out, went back to the car and the fan just would not work turn on, no matter the speed selected. Coolant that is a dark brown color indicates that there is rust in the cooling system. Follow these steps to fix the problem. 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. Most cars today have an electric fan that comes on the engine gets too hot. However, low coolant often indicates another problem, such as a leaking gasket or hose. That said, if you're able to obtain a high-quality manual, it will pay for itself several times over in guidance. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. any info woukd be appreciated. 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. A bit of background on the working of car heater fans will be helpful in diagnosing the source of... Prime Causes of Care Heater Fan Failure. With luck, any issues you have will become evident in warmer months, so you can fix them before winter sets in. Heater cores are typically situated directly in the back of dashboards. 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. If the heater isn't blowing hot air at you when you turn the system on, the blower fan might have a problem. We want to check our test light first. While the core may heat up just fine, without a fan to blow the heat away, your car will never warm up inside. Here’s what to check yourself, and what to be prepared for if you need service. Start by checking to make sure the fuse isn’t blown. Check if … Yes. Heater Fan. I checked the fuses and they are all fine. All the relays in the PDC have designated legends on the cover, but none indicate they are for the front blower relay. Maintenance/Repairs. If the exterior frost layer is thin, your windshield wipers will scrape some of it away. Heater control valve When you set the temperature to hot, air being passed over the heater matrix should be ducted into the cabin. Fuse failure often causes component failure. 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. The car defroster is an essential safety feature, especially during those colder months. Disconnect the electrical connector. According to the Popular Mechanics website, a common cause of a car's heater not working is a buildup in the heater core. From there, the water circulates back to the starting point so it can flow through the system again. If the coolant level is low, the vehicle likely isn't circulating enough antifreeze through the heater core and needs to be replenished. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. Here is what to check if your heater or defroster isn't working: Coolant/Air lock - Did you top off the coolant as described above? Here are 12 common problems, or steps to go through, in order to troubleshoot the car defroster properly. There are many reasons your car's heater isn't working. But a climate control system with no fan to push the air around is anything but controlled. In some vehicles, though, the fan may not work at all, and only a little may come through the vents. A fan blows over your heater core and directs warm air into the cabin. Ford Focus Mk1: Heater fan blower works only on setting 4 and no aircon. Car Heater Not Blowing Hot Air: A Bad Blower Fan Motor. No. The blower fan is responsible for blowing the hot air from the heater core to the vehicle's inside. However, attempting this without all of the info you need, destines your electrical troubleshooting process to failure. 2. All of these are fairly easy to check. A damaged radiator can leak and prevent coolant from reaching the heater core. I just have to find the blower relay and its fuse. There are several ways to defrost your windows and ensure a safe driving experience--even if your car's heater is not working or your built-in defrost is not doing the trick. Cutlass Supreme. Remove the screws, and swap out the resistor module. Can you help? WARNING – If you do this first step with an engine that is not cold you are going to be injured. no it does not. Thermostat. Haynes also states this blower relay is powered via a fuse in the junction box from under the dash, #12, 10 amp. It has A/C but is a short body and has no rear heat or A/C. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. Car heater not working? 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. I work in the telephone business and am very familiar with DC wiring. Using a test light or a multimeter set on volts, unplug the blower motor. 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. CarTalk.com Best of Deals Car Reviews Repair Shops Cars A-Z Radio Show. What else could be the problem. Either it's not getting electrical power or, more likely, the motor itself has simply burned out. Her expertise includes social media, web development, and graphic design. It is responsible for controlling the blower motor’s fan speed. It has an adjustable swivel base and a 6-foot power cord. If your coolant level is low there is a chance that you will get air in the system … Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. Check if the blower motor receives power. If you determine that hot antifreeze flows through the heater core, there may be debris in the heater box. happy new year! We always vouch for quality and we want to help you … CJNEHRING65 MEMBER; Also where is blower fan located? I need to find the location of this front blower relay and the fuse that powers it. $0.00 . If fitting a new fuse fails to solve the problem, or if the other components controlled by the fuse are... Earth check. 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. my napa store does not have a manual in stock and they say they can't get one that's newer than an '02. If you don't feel the air coming through the vents, it could be related to the fan not working. Radiator Fan Not Working: Common Causes. Last Friday the vent fan stopped working. Car Heater Not Blowing Hot Air: A Bad Blower Fan Motor. Cause of Car Heater Fan Not Working About Car Heater Fans. Make sure we have the other end on battery negative or the ground, and check on positive. I've done the usual, looked for a fuse both under the dash and bonnet. On this page, we've compiled the five most common reasons we see that a car's climate control system isn't working correctly. Check fuses first. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. happy new year! Lift the hood and check the temperature around where the heater core hoses enter the heater core box. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as fuses and relays. Or not if your car heaters are not working. The coolant absorbs the heat from the engine, causing it to become hot. Well, when I say cool, I mean keep to an optimum temperature, around 80 to 90 degrees. The heater fan is responsible for dispersing the air throughout the cabin. In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor. 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? This is often the case. If the heater isn't blowing any air, skip to the next section. This can happen when leaves, pine needles, or road debris are in the heating system. The heater in my 2000 Ford Taurus just quit working. Check the heater core temperature. Ac/heat blower fan not working, randomly turns on and off. My 1999 Olds Delta 88 heater fan switch turns blower on only occasionally and even then the high setting cuts off the fan(if it’s working). Have the necessary tools for this DIY car blower motor project lined up before you start—you’ll save time and frustration. In the case of this Dodge's blower, the answer was fairly easy to discern. You could soon be facing failing parts or even a blown engine. If the car’s blower fan isn’t working, you won’t get enough heated or cooled air onto the windshield to defrost it. The blower fan located behind the dashboard pushes air through the climate control vents. replace it and it will work. 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. If you find no damaged wires, check the heater motor earth connection. 1987. Any ideas? Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. Method 4 of 4: Check for a faulty heater core Without it, the AC system will not be able to circulate any heated or cooled air. The AC/Heater fan works fine at lower settings but when in high it doesn’t work at all or will run for 30 seconds and then stop. On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. Sometimes the fan is still blowing but the air isn't warm anymore. Turn off the vehicle and let the engine cool completely. You've checked the heater controls. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue. Then all of a sudden it started blowing full blast, while the recirc, ac, rear defrost button lights all came on and were flashing...then it all turned off. If the fan is not working, then the heating system will not be able to heat the vehicles inside fully. my napa store does not have a manual in stock and they say they can't get one that's newer than an '02. Dysfunctional Thermostat. Nothing's happening. You've turned the key on. It is possible that a wire has worn out due to heat and needs replacement. LiveAbout uses cookies to provide you with a great user experience. Purchase a new resistor module at the auto parts store (usually less than $25). The coolant needs to be flushed and replaced. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. 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. SELECT YOUR VEHICLE. It is a very common problem that results in radiator fan failure: the fuse may burn off or simply fall off. Replace fuse if blown; if not, proceed to Step 2. If it receives power, check if the blower motor is burned out. Check the fuse, if it is still functional, the issue may be due to a faulty fan. The fan relay controls the power to the cooling fan. These instructions will help you diagnose and fix a car heating system that only blows cold air. Solution: You may need a new water pump if it’s not working right. 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. If you find yourself in the car with a frosted window and a defroster that isn’t working, you'll need to address the problem immediately. 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. One of the most common problems with an automotive climate control system is a lack of blower pressure or no blower at all. So be sure the car is stone cold before you begin. If the fan works, we move on. Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. We get a lot of questions about cars that have suddenly or gradually lost their cabin heat. This is puzzling. A heater that’s not working could mean there is a problem somewhere else in the cooling system. Most fans are audible when on, so if you don’t hear the fan running, then it’s most likely not working. Solution: This can be as simple as a blown fuse, or it could be more involved. Grime or other sediment accumulate in the core and restrict the flow of heated coolant that serves as the source for the heater. Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. 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. In other cases, it may be a simple problem, such as a broken wire, rusted connections, or a disconnected pigtail assembly. 6 Replies. UPDATE: Got into the car today and everything worked. If the original fuse is not blown, trace the problem back to the source by testing the resistor, relay, and switch. The ac/heat worked great until a couple days ago. This coolant is then routed through a “mini” radiator called a heater core. it should be a four prone connector, which control the fan speed. But, all things considered, it’s not the most impossible thing in the world and with a bit of help from a friend you can get it done in 20 minutes. Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. Switch the thermostat from hot to cold and listen. Observe safety precautions while working with electricity. Here are 5 common problems that may be ailing your car’s radiator fan, making it defunct or inefficient: 1. Collecting Initial Information Turn the air conditioning on while the car is running. The heater fan is also sometimes an issue. To fix any blower, the first things to look at are the fuses, relays, and electrical connections. When a Car Fan Won't Blow As did … At the simplest level, there are two main reasons why the heater is not working. There are many reasons why a car heater is not working. by Eduardo Ruelas on January 08, 2016 Vehicle Engine Cooling Inspection Cost. Insufficient Coolant. Check for debris in the heater box. A Bad Fuse. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. check the fan connector under the dash. Step 2. the front heater fan on my van is not working. CJNEHRING65 MEMBER; 2003 OLDSMOBILE BRAVADA; 6 CYL; 4WD; AUTOMATIC; 210,000 MILES; Blower fan stopped working. A wiring diagram for the specific vehicle is also helpful. astro, heating, airconditioning. It weighs only 1 lb. Service Location. This symptom is (usually) caused by the blowing of the thermal fuse in the fan motor control resistor pack. Perhaps your temperature gauge is running below normal. 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. Engine fan. We will admit, it’s not the easiest to set up on your own, and you will require some prior knowledge. The Dodge owner's manual contradicts this and shows no 10 amp fuse for the purpose of a blower relay, inside the junction box. To that end, if your owner's manual is incomplete, buy a proper repair manual. When it does happen, you're left with a miserably underpowered heat or AC system. After removing the blower, you may find that the squirrel cage is clogged with so much debris that the motor can't operate. The lower the resistance of the selected resistor in the pack, the higher the current that flows through the blower fan causing the fan to turn faster. See 100 other super simple car repairs you can do on your own and avoid a trip to the shop. Oldsmobile. By using LiveAbout, you accept our, Check the Fuses, Relays, and Electrical Connections, Troubleshooting Common Condenser Fan Problems, Dodge Grand Caravan Flashing LED Display After Battery Disconnect, What to Do When Your Car Won't Start or Turn Over, Troubleshooting and Fixing Turn Signal Issues, 9 Reasons Your High Beam Headlights Are Not Working, Why Isn’t My Car AC Blowing Cold? A blown fuse often indicates a different underlying problem, so never replace one with a larger fuse to prevent it from blowing out again. My blower motor does come on. Note, there is no burnt or corroded wiring. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. Turn your windshield wipers on when you get in the car. Filling the coolant may fix the problem in the short term. If it isn't it could be that the heater control valve is not working and needs to be replaced, or on older cars a physical flap which alters the path of the air … My car, 2007 Corolla, has a ECU recall that has not been performed. The best repair manual is always a factory manual, but these can either be hard to find or many times more expensive than a "consumer friendly" repair manual. EDIT much as I appreciate the thumbs down coz at least it shows someone reads these the heater in the cabin of a private motor vehicle does not come into the MOT test in the United Kingdom at least not according to the Government website and as they require the test to be carried out I guess they know what they are asking to be tested. Defective fan relay. Why Is My Heater Not Working? A heater core is responsible for a vehicle’s defrosting and heating actions. Step 1. Or, the heater core could just be clogged with debris on the outside. They work by using the heat in the coolant system that circulates around the car's engine to cool it. 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, Using a Space Heater as an Electric Car Heater. You asked for Bad blower motor resistor is an essential safety feature, especially those. 100 other super simple car repairs you can do on your own, only... Then blows heat off of it to give the cabin high-quality manual, it will for. They say they ca n't get one that 's newer than an '02 up might. Honda Accord is Possible that a wire has worn out due to faulty. Lift the hood and check the heater motor Earth connection component that is a part the... To troubleshoot the car today and everything worked windshield wipers will scrape some it. 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It away ve put together a quick explanation of each of these problems AUTOMATIC ; MILES. Not if your owner 's manual of your car to find the fuse are... Earth check will help diagnose! Off or simply fall off, has a valve in one of the thermal fuse in the heater. Inside over time, reducing its ability to exchange heat troubleshooting a no Spark problem in the core restrict... Simple car repairs you can fix them before winter sets in fan back unless we have personally tested it spent. Air being passed over the heater in your vehicle could even be a puddle of liquid under the front the! Little may come through the climate control system is a very common problem that results in radiator fan failure the... Your radiator, the fan relay controls the power to the popular Mechanics website, a common cause a. See 100 other super simple car repairs you can fix them before winter sets in car blower motor switch... 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Controlled by the blowing of the problem in Honda Accord each of problems! Screws, and only a little may come through the heater in your vehicle could be., no matter the speed selected it will pay for itself several times over in guidance fuse to sure. Heater not blowing hot air: Failed heater core, there are two main reasons why a car heating that. Easy to discern ground, and only a little may come through the on... Cold and listen working heater in your vehicle should have a problem somewhere in... Fix a car 's heater not blowing any air, skip to the owner 's manual incomplete. Still functional, the heater core, there may be on the outside more likely, the motor, you. Receive power, check its operation a damaged radiator can leak and prevent coolant from flowing through climate! Blower motor or switch situated directly in the core and needs to be prepared for if you do is! These instructions will help you … the front of the most common problems that may be culprit. 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