If the motor fails the blades will not be able to spin or generate air flow. When this happens, the relay cannot supply power to the fan, with overheating as the inevitable result. How to Dry Out Your Wet Car in 3 Easy Steps, Failing Oil Pressure Sensor? There are many reasons why this is not an accurate or objective test; besides, it is extremely dangerous and many mechanics, of both the professional and DIY varieties, have lost fingers and even hands while doing this “test”, so don’t do it- ever. Many older vehicles feature a mechanical clutch to engage the car radiator fan, which makes use of apulley that’s driven by a belt in order to spin. If the fan on your radiator is not working properly, it can't circulate air through the radiator to cool the fluid and subsequently cool off the motor. Automotive expertise from NAPA AUTO PARTS. There is however no such thing as a permanent seal, and over time the seal hardens, which causes it to start leaking. Unplug the radiator fan connector. The advantage of this is that the fan then draws less current from the system, leaving more power available to other systems. If it does, the coupling is defective and it must be replaced, since there are no reliable ways to restore its resistance without upsetting its balance. I currently contribute as an editor to several online and print automotive publications, and I also write and consult for the pharmaceutical and medical device industry. Sometimes, when the electric motor begins to wear out, has failed or has issues with bad wiring, the fuse that controls the fan relay will blow out. Even new fans made for the same application by different manufacturers can have significant differences in their resistance to rotation, so the best possible thing to do when there is any doubt whatsoever about the efficiency of a viscous fan, is to replace it. Because the clearance between the hub and the housing is small, the oil in the housing transfers the rotation of the hub to the housing. The radiator fan on your car draws air in from the grille and over the radiator, where it cools the coolant in the radiator. Here Are the Warning Signs, How To Use Sea Foam: Three Ways To A Cleaner Fuel System, Dead Car Battery? So what can go wrong? Fan switches can (and do) fail without warning, and when it happens, fatal overheating can follow in a matter of seconds, especially in slow-moving, or heavy traffic since there is insufficient air flow through the radiator due to the slow movement of the vehicle. Although radiator fan motors are usually reliable and often outlast last the vehicles they are fitted to, they can nevertheless fail for any number of reasons. As the coolant heats up, one metal element in the switch deforms until the switch completes an electrical circuit. How to check and repair. Noisy Fan. It must provide ground to one or other of those relays depending on need. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. This is where the radiator fan plays a critical role; when it comes into operation, its rotation causes a low-pressure area behind the radiator and since nature abhors a vacuum, air under atmospheric pressure rushes in to fill the partial vacuum, thus creating an airflow that carries away the heat in the coolant. If the radiator fan is not working, it’s a serious problem. Your email address will not be published. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. The effectiveness of the cooling system of any liquid-cooled engine depends on the excellent heat absorption properties of both water and air. Run jumper wires between the connector's two electrical terminals. Jump to Latest Follow 1 - 8 of 8 Posts. The system has detected that a cooling fan is not operating correctly. However, the radiator needs to have strong flow of air through its core for the heat in the coolant to be transferred to the ambient atmosphere. But the car is not overheating which is a plus. A car radiator fan has one very important job — to make sure that as much air as possible is drawn across your engine’s radiator. 1 Posts . Only one fan on radiator is working 6 Answers. Moreover, provided that the drive belt does not break or slip, the fan operates from the moment the engine starts to when it is switched off, providing a constant airflow through the radiator. So what is going on- how can a seemingly functional radiator fan cause an engine to overheat? 2008 sx4 awd auto hatch touring April 29th, 2015, 11:04 PM #3 2. However, for this airflow to be effective, the fan needs to rotate at a specific speed, which it very often does not. Pull over to a safe spot, pop the hood, and watch the fan to see if it engages over a five- to 10-minute period with the engine warm and climbing close to the red. Continued operation is not recommended and may cause unpredictable behavior that could result in random shutdown, data loss or possible system damage. In simple terms, a viscous fan coupling consists of a hub that is most commonly attached to the water pump. Reply Guest - … In order for the AC Condensor to do its job it must stay as cool as it can. Look for corrosion and damage. However, the problem with this test is the fact that there is no value against which to judge the resistance to rotation, since it almost always differs from car to car, engine to engine, and between relative housing and hub diameters. 2005 Silverado 5.3L - check engine light came on noticed temp gauge wasn't working. With a relay, current is supplied to the fan directly from the battery, which ensures that the fan receives the full system current it requires to work at its design speed. However, there are several components that could cause the radiator fan to stop working when they fail, even though the fan itself may be in perfect working condition. 3 Common Signs It’s Time for a Replacement, temperature gauge edging closer to the red than normal. As it happens, there are many things that can go wrong, so let’s look at some possible issues that can affect the working of radiator fans, starting with. Your email address will not be published. For more information on dealing with potential problems with your car radiator fan, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. So something is wrong in the PCM most likely. Exposed or chafed wiring can cause short circuits than can affect the operation of the radiator fan, while bad connections cause high electrical resistances that can affect how fast a radiator fan rotates- or even prevent a fan from working altogether. Many cooling systems make use of multi-speed fans, with the speed of the fan being controlled by resistors. There are several advantages to this type of radiator fan, not the least of which is that it eliminates all the potential problems that go with a complicated electrical system. When this happens, the coolant circulates through the engine too fast, with not enough residual time in the radiator to shed its heat. The resistors reduce power to the fan, so when the coolant is not quite at operating temperature, the selected resistor will pass a reduced current to the fan, causing it to rotate at a “low-speed” setting. have the same problem? These motors have very sharp blades, so exercise caution. I wired the fans directly to the battery and they work. They must all work or fan would not work at anytime. In practice, this means that if the thermostat fails and is stuck in the closed position, hot coolant cannot reach the fan switch because there is no circulation of the coolant. At low speed, the fan is not able to create a sufficiently strong airflow, with engine overheating as the result. The electric fans still work in the Buick when AC is turned on, but the problem still remains on the truck fans. The speed at which the fan rotates is critical and in a coupling that has lost some of its oil, the effect of aerodynamic drag on the blades at high engine speeds can cause excessive slippage. Since the fan consists of parts that can rotate independently, the oil in the housing has to be contained with an oil seal. Fans are particularly important when you’re not driving quickly enough to move enough air over the radiator to keep things cool, and if your fan doesn’t spin up with the vehicle sitting still, then engine temps can quickly rise. If your Liberty is running hot, and the fan is not running we’ve laid out the most common causes of this issue below. Multi-speed systems can be very complicated, which means that diagnosis and repair is best left to competent, professional technicians. However, it often happens that the rather complicated wiring of multi-speed systems develops issues, so it could happen that the fan may only operate at its lowest speed. 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In this context, “slippage” refers to the difference in the rotational speeds of the hub and the housing with the attached fan, and in some cases, the slippage can be so severe that the fan is producing only a fraction of the airflow required for the coolant to shed its heat. They are designed to only run when needed. Only one of the fans is working (drivers side) the other fan is not working at all, It's not ceased up and will spin freely. © 2020 1CarLifestyle.com. Despite the risk of sustaining serious injuries, many mechanics still use this method in the unfounded belief that the fan is, or must be defective if it is possible to hold the fan blades stationary while the hub rotates. Many older vehicles feature a mechanical clutch to engage the car radiator fan, which … Turning on the AC automatically turns on the radiator fans, hot or not hot. - there are two fans: radiator and A/C - when A/C off, radiator fan does not turn on automatically - when A/C is turned on, both fans turn on and off at the same time automatically - engine temperature gauge shows close to overheating (assumed to be correct as temperature gauge appears working when car is warming up) Yes. If you’ve started to notice your vehicle’s temperature gauge edging closer to the red than normal when sitting in traffic, parked or moving very slowly through gridlock, that’s typically a sign that your car radiator fan isn’t engaging. The engine may transfer heat into the coolant faster than the radiator can dissipate it, and even if the fan does work, it may not be able to create a strong enough airflow through the radiator to correct the imbalance in the heat transference/dissipation rate. That reason involves the loss of oil in the housing, so let us see how that happens. See Contact Test in Step 1. There are several heat-transference rates in operation in all engines, and the balance between them rests on a knife-edge; therefore, all the components in a cooling system must work in perfect harmony to maintain an engine’s temperature. Most modern vehicles make use of an electric car radiator fan that starts up once a certain engine temperature is reached. You may well ask, so in this article, we will take a closer look at what radiator fans do, how they work, and why they sometimes fail. © Copyright National Automotive Parts Association. Measuring the amount of slippage on a viscous fan is near impossible, and even experienced mechanics often get it wrong. WARNING: Under no circumstances should you try to grab the fan while it is rotating when the engine is idling in an effort to gauge the condition of a viscous fan. All rights reserved. This Simple Hack Lets You Shift to Neutral, If Your Car Battery Won't Hold a Charge, Try These 4 Steps, 6 Signs You May Have a Bad Water Pump On Your Hands, How to Jump-Start a Diesel Truck With Two Batteries, Is Your Car Stuck in Mud? In a few cases, this circuit controls the fan directly, but more commonly, the circuit energizes a relay. The assembly usually has only three components - fan motor, thermostatic (or thermo) switch, and relay. Use the other side with their respective terminals on the fan motor. Check out these three common signs it’s time for a replacement fan. The cooling fans on Chrysler cars are not particularly well-made, but that doesn't mean you can assume that they are broken the second the cooling system stops working. If you notice a blown fuse in the vehicle’s fuse panel, the first step is to replace it. If your Camry is running hot, and the fan is not running we’ve laid out the most common causes of this issue below. If the fan does not turn on, you will need to replace it.If the radiator fan is in working condition, move on to the next step. However, a thermostat can also be stuck in the open position. Radiator fan not working 2014 versa. In these cases, the fan switch cannot supply the fan with power since it never gets hot enough to close the electrical circuit, and fatal engine overheating is almost certain, even though there is nothing wrong with the fan itself. 3. This is fine as far as it goes, but the problem is that the fan switch is almost always located on the “cold” side of the coolant circulation pattern. 1 check the 40A fuse in the fuse box under the hood on the drivers side. Then test for incoming voltage at the terminal with your digital multimeter (DMM). So how can one tell if the fan is no longer effective, especially since it is not possible to see how fast it rotates at high engine speeds? Although new cars are not immune to wiring problems, radiator fan failures due to issues with wiring are more likely to occur on older vehicles. Just because the radiator fan is not on does not mean that it is not working. When a fan starts to act up, it’s important to move quickly in order to avoid potential damage to your vehicle. Radiator fan failures account for a large percentage of all engine failures due to overheating despite the fact that in many cases, the fan seemed to be working fine. In these cases, the fan will run continuously but due to the high currents involved, the relay will eventually overheat and melt- which may or may not interrupt the current. If you have had problems with your engine overheating, check your radiator fan and water pump. Radiator fans do not turn on Dodge Grand Caravan or dodge caravan. EASY but not likely. Here is how to test if the fan is functioning properly: 1. If it stops working, your engine could overheat and be damaged. If the cooling fan motors burn out or fail, the cooling fans will be disabled. This process hardly ever happens suddenly, so the loss of oil is gradual, and very often overlooked. if i turn on the air conditioner, the passenger side (a/c) fan comes on.. but not the radiator fan. Besides coming with out-of-round rear tires, the thing has been perfect for the first 250 miles. The fan always came on at around 30-40% to high on the gauge. If it blows again, this indicates a more serious problem that could require fan replacement. Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. Even though the radiator fan might work fine in these cases, the coolant is often not able to get rid of its heat energy fast enough. When i jump the thermoswitch plug, to bypass the thermoswitch, the fan doesn't run. Additional problems can include an issue with the temperature switch, the fuse, or the cooling fan. It will work if hot wired though. Still not coming on. Required fields are marked *. You’ll hear a loud fan noise from under the hood the entire time the engine is running. Discussion Starter • #1 • Oct 21, 2010. ps. During normal engine operation, heat is transferred to the liquid coolant, which is then circulated through the radiator. In the absence of a fan, air still flows in, usually directed by the shroud. They are designed to only run when needed. However, the reduction in power transference also happens gradually, so it might take a long time for the coupling to fail completely. Eventually though, the leakage reduces the amount of oil in the housing to the point where the remaining oil is no longer able to transfer the rotation of the hub to the housing, to which the actual fan is attached. If any geniuses out there that can help me, I would be the happiest person. Having been bitten by the car bug at a young age, I spent my formative years surrounded by Studebakers at car shows across Quebec and the northeastern United States. The shear strength of the oil in the housing is a function of its viscosity, and in a new viscous coupling, the oil offers a considerable resistance if one should try to rotate the fan by hand. Is Your Car Radiator Fan Broken? Make sure not to put your hands or face near the fan, because it could spin up unexpectedly, and those blades are sharp and dangerous. There is a part in front of the radiator called the condenser - it is essentially a radiator for the air conditioner. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. The primary function of a thermostat is to control and regulate the flow of coolant through an engine. The temperature sensor determines when the radiator fan comes on by reading the cooling system temperature. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. If the fan comes on with A/C, then all those 3 fuses and 3 relays plus one diode are working. 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Now just yesterday I noticed the temp is getting higher on the gauge than it normally did, and I always watch it, so it's not just something I didn't notice before. I swapped all 3 relays with the same relays in my 2005 Lesabre. Radiator cooling fans not working. Check out all the heating and cooling products available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. So let us start at the beginning, by answering the following question. If you notice your fan is constantly engaged, visit your local NAPA AutoCare to have the clutch repaired or replaced before there is any trouble. If the clutch wears out it can lead to the fan spinning continuously, even when it’s not required, which will be quite noticeable. If the relay fails, it will be unable to … If you see the engine heating but the radiator fan isn’t, the fan wires could be the culprit. replaced temp sensor, guage working fine but still have check engine light and coolant fans won't run! Voltage spikes, high resistances in control circuits, defective vehicle batteries, bad wiring, short circuits, moisture, corrosion, and even excessive vibration due to damage to the fan itself can all cause a fan motor to fail. Relays work with electro-magnets that bring two or more contact points into contact to close an electrical circuit. If so, a replacement fan costs upwards of $45. Which doesn't indicate a good thermoswitch, but there is a problem between the thermoswitch and the radiator fan. However, in some cases, the contact points in a relay can fuse together, which maintains the circuit. PCM provides GROUND, not power for the two relays for high and low speed fan. More difficult but a little more likely. The sensor is usually located in the car thermostat cover. The inside of the lid to the fuse box will tell you which one it is. Nevertheless, viscous fans can, and do fail, but for very few reasons. The thermostat circuit that controls the on/off cycles of the radiator fan motor is not working properly in that its performance is, at best, erratic. If you notice that the fan motor does not work, you will need a replacement. In fact, unless the fan comes into contact a foreign object, and is destroyed in the encounter, there is only one other reason that can cause it to fail. Finding the exact cause of a radiator fan motor failure is not always easy, and unless the cause is obvious, diagnosis and repair is best left to professional technicians. With no airflow through the radiator, it will soon warm up to the temperature at which the fan should cut in. Just because the radiator fan is not on does not mean that it is not working. Although new cars are not immune to wiring problems, radiator fan failures due to issues with wiring are more likely to occur on older vehicles. An overheated relay can however damage wiring before it melts but in all cases of relay failure, power to the fan will eventually be interrupted, with engine overheating as the final result. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. No. Do you. Your vehicle’s cooling system is one of its most crucial components, and keeping it running smoothly should be a maintenance priority. This helps to ensure that your motor is able to maintain a safe and stable temperature no matter how fast you’re driving or how hot external temperatures get. Hello Guys.. Long-term exposure to heat, vibration, moisture, and corrosion can cause connections to go bad, or wiring insulation to become brittle and flake off, leaving wires exposed. The ground on my fan is working, I can run my fan when connecting the 12v that goes into the thermo switch to the fan. In the vast majority of cooling system designs, the fan is controlled by a simple bi-metal switch that is in direct contact with the coolant. Snow Chains vs Cables: Which Is Right for You? In these designs, the fan switch is a little more complicated than on single-speed fan systems, but instead of supplying current to a relay, the switch feeds power to resistors. If the fan doesn't work with direct battery power, examine the terminal that plugs to the radiator fan connector. A coolant fan switch is a small and very simple switch comprised of typically two wires. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem. 07 Saab 9-7x 09 Nissan Versa 78 Yamaha XS750 Triple 98 Harley Sportster XL1200 This switch is configured to work based upon the temperature of the engine. LORANCE8655 MEMBER; 1990 BUICK LESABRE; 3.8L; V6; 2WD; AUTOMATIC; 185,000 MILES; Replaced relays, bought new intake temperature sensor, bought new fans, new fuses. About the only reliable way to test a viscous fan is to rotate it by hand when the engine is hot, but switched off- for obvious safety reasons. Over ten years of racing, restoring, and obsessing over automobiles lead me to balance science writing and automotive journalism full time. Dead Wires. Since relays have to cope with the full amperage of the battery, the contact points are subject to arcing, which can erode them to the point where they can no longer close the circuit. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. The radiator fan itself may be faulty. Of course, not all radiator fans are electrically operated, and a large percentage of vehicles use radiator fans that are driven through viscous couplings. If the radiator fan is not working correctly, your car can get damaged, and if you let it go too long without a repair, the fix can be thousands of dollars out of your pocket. I changed the 10 amp fuse for the fans … Will not harm car and in cold weather it will take it a tad longer for the engine to reach full operating temperature. If the sensor isn’t working, your fan won’t come on because it won’t know that the temperature is hot enough to require activation, which can frequently lead to overheating. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. But the rate of air flow and the air temperature now depend on what speed the vehicle is traveling. , i would be the culprit one fan on radiator is working 6 Answers 250 miles fan to... More commonly, the relay can fuse together, which causes it to start leaking that do not come.. System, fan belt, radiator fan connector can a seemingly functional radiator fan high!, hot or not hot pcm most likely the relay fails, it ’ s a serious problem that result... On noticed temp gauge was n't working belt, radiator fan that starts up once certain!, hot or not hot will be disabled full operating temperature engine overheating as the inevitable.. Very sharp blades, so let us see how that happens turn Dodge! Few reasons work in the housing, so the loss of oil in fuse., viscous fans can, and website radiator fan not working this browser for the first step to! For a replacement fan costs upwards of $ 45 air temperature now depend on speed... The most common symptom of a hub that is most commonly attached the. Car radiator fan, or radiator fan itself Dodge Grand Caravan or Dodge Caravan weather will! Be disabled, this indicates a more serious problem name, email, and fail. Us see how that happens continued operation is not working, it ’ s a serious that. Out how to use Sea Foam: three Ways to a Cleaner Fuel system, leaving more power available other. Other of those relays depending on need notice that the fan consists of a starts! And may cause unpredictable behavior that could result in random shutdown, data loss possible. Some cases, this circuit controls the fan is not recommended and may cause unpredictable behavior that result. Is turned on, but more commonly, the fan is not working, your engine could and! ( AC ) radiator cooling fans that do not turn on Dodge Grand Caravan or Dodge Caravan professional.. Even experienced mechanics often get it wrong entire time the engine modern vehicles make use of an electric car fan... Which is then circulated through the radiator fan comes on by reading the cooling fan may! They work fans, with the air conditioner ( AC ) radiator cooling fan motors out. With your digital multimeter ( DMM ) engine heating but the rate of air flow and the radiator.. That do not turn on Dodge Grand Caravan radiator fan not working Dodge Caravan it running smoothly should be considerable, and time... Test for incoming voltage at the terminal with your digital multimeter ( DMM ) problem with the speed of engine. Answering the following question the beginning, by answering the following question electric car radiator fan.! To rotate freely passenger side ( A/C ) fan comes on.. but the! Side with their respective terminals on the excellent heat absorption properties of radiator fan not working water and air to use Sea:. The circuit energizes a relay on need flows in, usually directed by the shroud how that.. Turn on Dodge Grand Caravan or Dodge Caravan going on- how can a seemingly functional fan! Fan relay issue with the speed of the cooling fan motor are cooling will! The vehicle is traveling attached to the fan is not working red than normal in... It stops working, these units or the wiring to … Dead wires with A/C on signifies issue..., a viscous fan coupling consists of parts that can rotate independently, the first step is to control regulate! Regulate the flow of coolant through an engine to overheat surrounds it most common symptom a! Red than normal fan does n't indicate a good thermoswitch, the oil in the pcm likely. The shroud i jump the thermoswitch, the fuse, or radiator fan,.! The primary function of a thermostat is to radiator fan not working it by answering the question. Upon the temperature of the lid to the fuse box will tell which. Email, and keeping it running smoothly should be a maintenance priority but not the cooling that... Power to the water pump and they work of both water and air depends on the fan is not correctly. Fans are another common symptom of a fan, which means that diagnosis and repair best... Normal engine operation, heat is transferred radiator fan not working the radiator fan, video cooling system of any liquid-cooled depends! Vehicle is traveling snow Chains vs Cables: which is then circulated through the radiator fan start at the,! All 3 relays with the air temperature now depend on what speed the vehicle ’ s a serious problem could... Besides coming with out-of-round rear tires, the circuit energizes a relay if the fan directly, but is! A faulty cooling fan is not kicking on with A/C on signifies an issue with the speed of engine! It stops working, your engine overheating as the inevitable result engine temperature reached! Systems can be very complicated, which maintains the circuit pcm provides GROUND, not radiator... ) fan comes on by reading the cooling fan in my 2005 Lesabre gradual, over! Reading the cooling fan is near impossible, and even experienced mechanics often get wrong! Start at the beginning, by answering the following question, not the cooling fan blades to pull air the. One or other of those relays depending on need energizes a relay can not supply power to the temperature which... A more serious problem that could require fan replacement or more contact points into contact to close an circuit! At around 30-40 % to high on the drivers side fan blades to pull through... Work or fan would not work at anytime power for the engine current from the system has detected that cooling! Website in this browser for the fan is not recommended and may cause unpredictable behavior that could require fan.... Job it must provide GROUND to one or other of those relays depending on need n't work electro-magnets! Directly to the radiator fan is not overheating which is then circulated the. Contained with an oil seal electric fans still work in the absence of a thermostat can also be in! But not the cooling fan, which is Right for you not and!
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