If the car’s blower fan isn’t working, you won’t get enough heated or cooled air onto the windshield to defrost it. To determine the cause of a blower fan failure, isolate the motor, and perform some basic electrical tests. Check out what he's been through, and why he should have asked an expert from the start. 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? If the heater core goes bad, it'll need to be replaced. If you determine that hot antifreeze flows through the heater core, there may be debris in the heater box. When it comes to broken heaters, there are several common problems that could be the culprit. How Does Your Car Heater Work? Can you help? Switch the thermostat from hot to cold and listen. Ac/heat blower fan not working, randomly turns on and off. $0.00 . Replace fuse if blown; if not, proceed to Step 2. Make sure we have the other end on battery negative or the ground, and check on positive. Note, there is no burnt or corroded wiring. no it does not. When the A/C system or heater isn't working on your car, you want to know what could be the cause and what'll need to be done to fix it. The Dodge owner's manual contradicts this and shows no 10 amp fuse for the purpose of a blower relay, inside the junction box. Without it, the AC system will not be able to circulate any heated or cooled air. Yes. 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. Reconnect the electrical connector and you’re car heater blower motor is back in business. ProTech: Probably a bad blower motor resistor you have there, or possibly a faulty blower motor or switch. 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. Have the necessary tools for this DIY car blower motor project lined up before you start—you’ll save time and frustration. That said, if you're able to obtain a high-quality manual, it will pay for itself several times over in guidance. 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. With luck, any issues you have will become evident in warmer months, so you can fix them before winter sets in. If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. On this page, we've compiled the five most common reasons we see that a car's climate control system isn't working correctly. If the vehicle burns coolant, it may have a blown head gasket, which can be costly to fix. I just have to find the blower relay and its fuse. My problem is on a 1996 Dodge Caravan 3.3 liter. The heater fan is responsible for dispersing the air throughout the cabin. Step 2. Heater fan not working. Haynes also states this blower relay is powered via a fuse in the junction box from under the dash, #12, 10 amp. The coolant is housed in a translucent plastic jug in the engine compartment. Check if the blower motor receives power. At the simplest level, there are two main reasons why the heater is not working. Many different things can go wrong here causing the whole system to work poorly or not at all. A damaged radiator can leak and prevent coolant from reaching the heater core. Engine fan. A heater that’s not working could mean there is a problem somewhere else in the cooling system. One of the most common problems with an automotive climate control system is a lack of blower pressure or no blower at all. 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. However, attempting this without all of the info you need, destines your electrical troubleshooting process to failure. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. If fitting a new fuse fails to solve the problem, or if the other components controlled by the fuse are... Earth check. On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. It weighs only 1 lb. Is the heater blowing cold air into the car, or is the car heater not blowing any air at all? 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. So, it works. We always vouch for quality and we want to help you … The fan relay controls the power to the cooling fan. The fan will not blow when turned on and there is no heat coming out of the vents when the heater is on. If the heater isn't blowing hot air at you when you turn the system on, the blower fan might have a problem. So this is where the heat comes from, your cooling system. Reconnect the electrical connector and you’re car heater blower motor is back in business. Heater Fan. Why is the Heater Not Working? If the original fuse is not blown, trace the problem back to the source by testing the resistor, relay, and switch. Perhaps your temperature gauge is running below normal. Collecting Initial Information Turn the air conditioning on while the car is running. 6 Ways You Could Be Killing Your Car . I work in the telephone business and am very familiar with DC wiring. All you have to do is unplug the wires from the radiator and check their integrity by using a voltmeter. Her expertise includes social media, web development, and graphic design. In the case of this Dodge's blower, the answer was fairly easy to discern. Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. The fan inside your car then blows heat off of it to give the cabin heat. 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. happy new year! 2. Step 1. You need to inspect all the wiring leading into and out from the radiator fan. 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 … 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. A fan blows over your heater core and directs warm air into the cabin. Follow these steps to fix the problem. But a climate control system with no fan to push the air around is anything but controlled. I've replaced the switch in the dash,… My 91 Chevy Astro doesn’t like to blow air on high. Important Tip: If your car heater stops working, schedule an appointment to have us check it out. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. How to fix a car heater Wiring check. Bring broad knowledge of electricity and specific knowledge of the use of electrical testing equipment. When a Car Fan Won't Blow As did … If your coolant level is low there is a chance that you will get air in the system … A wiring diagram for the specific vehicle is also helpful. Car Heater Not Blowing Hot Air: A Bad Blower Fan Motor. Heater cores are typically situated directly in the back of dashboards. 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. Last Friday the vent fan stopped working. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue. Another reason why your car AC fan is not working could be due to your cabin air filter. Some theories: ECU/ECM causing this. If your car has no heat, not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can pose a hazard while driving. If you notice that your thermostat gauge stays on the “C” even after the … Well, when I say cool, I mean keep to an optimum temperature, around 80 to 90 degrees. 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. Most cars today have an electric fan that comes on the engine gets too hot. Sometimes the fan is still blowing but the air isn't warm anymore. We want to check our test light first. Car heater not working? I have a 2000 Honda civic ex. 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 the heater isn't blowing hot air at you when you turn the system on, the blower fan might have a problem. There are many reasons your car's heater isn't working. check the fan connector under the dash. If the heater isn't blowing any air, skip to the next section. In some vehicles, though, the fan may not work at all, and only a little may come through the vents. Step One – Start With A Cold Engine – Check The Coolant . Required Tools for this Project. According to the Popular Mechanics website, a common cause of a car's heater not working is a buildup in the heater core. The fan came on and is working normal. 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. AC/Heater fan won't work on High. If the fan is not working even when the car is heating up there might be a problem with the wiring. If the vehicle has a valve in one of the hoses, check its operation. Observe safety precautions while working with electricity. Here’s what to check yourself, and what to be prepared for if you need service. 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. Defective fan relay. If the fan works, we move on. Cutlass Supreme. If the fan is not working, then the heating system will not be able to heat the vehicles inside fully. 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? Ford Focus Mk1: Heater fan blower works only on setting 4 and no aircon. You've checked the heater controls. The car heaters we recommend in this guide have all … If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. Any ideas? Tuesday, November 12th, 2019 AT 1:36 AM . Turn your windshield wipers on when you get in the car. The air conditioner … The only way to determine which component has failed is to grab some basic diagnostic tools, access the blower motor, and check whether or not it receives power. However, low coolant often indicates another problem, such as a leaking gasket or hose. the front heater fan on my van is not working. This can happen when leaves, pine needles, or road debris are in the heating system. The car defroster is an essential safety feature, especially during those colder months. 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. There could even be a puddle of liquid under the front of the vehicle. He also ghostwrites articles for numerous major trade publications. Check the coolant level. Purchase a new resistor module at the auto parts store (usually less than $25). UPDATE: Got into the car today and everything worked. If you don't feel the air coming through the vents, it could be related to the fan not working. It should have level indicators that show how full or empty it is. This coolant is then routed through a “mini” radiator called a heater core. You've turned the key on. Heating systems consist of a heater core, a heater fan, the car’s coolant system, and your HVAC controls. 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. 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. Thermostat. So, you've confirmed that your heat or AC is not working. The heater in my 2000 Ford Taurus just quit working. Mercury Sable (or Ford Taurus) Heater Is Not Working. 7 Possible Causes, Troubleshooting a No Spark Problem in Honda Accord. WARNING – If you do this first step with an engine that is not cold you are going to be injured. 1987. Cabin air filters serve as a filter to the outside air coming into your car to make sure it … The blower fan located behind the dashboard pushes air through the climate control vents. Remove the screws, and swap out the resistor module. 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. This is puzzling. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as fuses and relays. I checked the fuses and they are all fine. Nothing's happening. The coolant absorbs the heat from the engine, causing it to become hot. You could soon be facing failing parts or even a blown engine. 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. We will admit, it’s not the easiest to set up on your own, and you will require some prior knowledge. If not, you need the fan serviced. Step 1. Filling the coolant may fix the problem in the short term. 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. 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). A lack of heat can be a symptom of a much larger problem. This is often the case. Radiator. If that’s the case and you don’t get it fixed, you could wind up with a major repair expense, or worse… an engine that needs to be replaced. 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. What causes cooling fans not to come on? I’ve replaced the switch in the dash, but that didn’t help. All of these are fairly easy to check. A Bad Fuse. replace it and it will work. From there, the water circulates back to the starting point so it can flow through the system again. Lift the hood and check the temperature around where the heater core hoses enter the heater core box. The specific diagnostic procedure varies depending on the vehicle. Heater control valve When you set the temperature to hot, air being passed over the heater matrix should be ducted into the cabin. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. Car Heater Blowing Cold Air: Failed Heater Core. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. I noticed the fan was not blowing any air through the vents. the front heater fan on my van is not working. Radiator fluid runs through the engine and becomes hot. Or not if your car heaters are not working. If you find no damaged wires, check the heater motor earth connection. What else could be the problem. Maintenance/Repairs. Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. If the valve is stuck and prevents coolant from flowing through the heater core, that may be the source of the problem. After removing the blower, you may find that the squirrel cage is clogged with so much debris that the motor can't operate. Coolant that is a dark brown color indicates that there is rust in the cooling system. CJNEHRING65 MEMBER; 2003 OLDSMOBILE BRAVADA; 6 CYL; 4WD; AUTOMATIC; 210,000 MILES; Blower fan stopped working. It is a very common problem that results in radiator fan failure: the fuse may burn off or simply fall off. Do you. If the exterior frost layer is thin, your windshield wipers will scrape some of it away. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. Check if … Checking a heater fan circuit. These instructions will help you diagnose and fix a car heating system that only blows cold air. If the blower doesn't receive power, check the blower fuse to make sure it's not blown. 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. But a climate control system with no fan to push the air around is anything but controlled. Most fans are audible when on, so if you don’t hear the fan running, then it’s most likely not working. If it receives power, check if the blower motor is burned out. How strange… it wasn’t working for two days and magically it worked today. 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. Cause of Car Heater Fan Not Working About Car Heater Fans. Fuse failure often causes component failure. Dysfunctional Thermostat. All right. wanpi17. Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. Service Location. It is possible that a wire has worn out due to heat and needs replacement. Insufficient Coolant. Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. Disconnect the electrical connector. A heater core is responsible for a vehicle’s defrosting and heating actions. 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. It has an adjustable swivel base and a 6-foot power cord. LiveAbout uses cookies to provide you with a great user experience. Radiator Fan Not Working: Common Causes. 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. and is 13” long. Why Is My Heater Not Working? Follow these steps to fix the problem. Just like your radiator, the heater core can rust, corrode and clog inside over time, reducing its ability to exchange heat. Fan works, but still no heat? 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. So be sure the car is stone cold before you begin. The coolant needs to be flushed and replaced. Check fuses first. 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. 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. 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. RoadPro RPSL-581 | Best Portable Car Heater. If your car is running low on coolant, if there’s air in the system or if the core itself isn’t working properly, then this could be the cause of your car heater not working. The heater fan is also sometimes an issue. This symptom is (usually) caused by the blowing of the thermal fuse in the fan motor control resistor pack. I need to find the location of this front blower relay and the fuse that powers it. Check for power at the motor itself. The blower fan located behind the dashboard pushes air through the climate control vents. As it passes through the engine, the water absorbs the heat and is then circulated through a heater core where a fan blows the warm air into the interior of your car, truck or van. Refer to the owner's manual of your car to find the fuse box location and locate the fan fuse. As did the author of this letter, you want your fan back. by Eduardo Ruelas on January 08, 2016 Vehicle Engine Cooling Inspection Cost . Oldsmobile. To fix any blower, the first things to look at are the fuses, relays, and electrical connections. That sounds a little odd right? 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 ac/heat worked great until a couple days ago. We get a lot of questions about cars that have suddenly or gradually lost their cabin heat. If your car has no heat, not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can pose a hazard while driving. Grime or other sediment accumulate in the core and restrict the flow of heated coolant that serves as the source for the heater. We’ve put together a quick explanation of each of these problems. It’s a relatively common problem, and it makes sense to consider a few quick fixes before bringing it in to the shop. 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. It is responsible for controlling the blower motor’s fan speed. When it does happen, you're left with a miserably underpowered heat or AC system. have the same problem? happy new year! Method 4 of 4: Check for a faulty heater core See 100 other super simple car repairs you can do on your own and avoid a trip to the shop. There are many reasons why a car heater is not working. Important Tip: If your car heater stops working, schedule an appointment to have us check it out. That means a trickle out of your vents instead of the rush you asked for. Check for debris in the heater box. While the core may heat up just fine, without a fan to blow the heat away, your car will never warm up inside. 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? Maybe the fan is malfunctioning. SELECT YOUR VEHICLE. CJNEHRING65 MEMBER; Also where is blower fan located? Solution: This can be as simple as a blown fuse, or it could be more involved. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. Solution: A mechanic can replace the switch or sensor that controls the fan. Is There a Cheaper Alternative to Air Conditioning? 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. astro, heating, airconditioning. Either it's not getting electrical power or, more likely, the motor itself has simply burned out. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. To find out what's wrong with your car's heating system and what you can do to fix it, you first need a basic read of the situation. No. Or, the heater core could just be clogged with debris on the outside. 6 Replies. 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. It is my parents did not look at yet usually it is on firewall under hood possibly under dash … In other cases, it may be a simple problem, such as a broken wire, rusted connections, or a disconnected pigtail assembly. Here are 12 common problems, or steps to go through, in order to troubleshoot the car defroster properly. The safest way to do this is with a non-contact infrared thermometer. Follow the Power. To that end, if your owner's manual is incomplete, buy a proper repair manual. I was out, went back to the car and the fan just would not work turn on, no matter the speed selected. Using a test light or a multimeter set on volts, unplug the blower motor. RoadPro Car Fan, Heater, 12V, 15A This 180W heater uses one 20 Amp blade fuse and plugs into lighter. Car Heater Not Blowing Hot Air: A Bad Blower Fan Motor. any info woukd be appreciated. Check the fuse, if it is still functional, the issue may be due to a faulty fan. 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? CarTalk.com Best of Deals Car Reviews Repair Shops Cars A-Z Radio Show. Christine Baker is a marketing consultant with experience working for a variety of clients. It is responsible for controlling the blower motor’s fan speed. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. I've done the usual, looked for a fuse both under the dash and bonnet. Turn off the vehicle and let the engine cool completely. All the relays in the PDC have designated legends on the cover, but none indicate they are for the front blower relay. Solution: You may need a new water pump if it’s not working right. by Eduardo Ruelas on January 08, 2016 Vehicle Engine Cooling Inspection Cost. My car, 2007 Corolla, has a ECU recall that has not been performed. It has A/C but is a short body and has no rear heat or A/C. FIND THE BEST PRICE We never recommend a product unless we have personally tested it or spent enough time researching its effectiveness. A blown fuse often indicates a different underlying problem, so never replace one with a larger fuse to prevent it from blowing out again. First thing we want to do is check the fuses. any info woukd be appreciated. Basically it’s a small radiator that hot coolant flows through. The blower fan is responsible for blowing the hot air from the heater core to the vehicle's inside. Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. 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