As the coolant heats up, one metal element in the switch deforms until the switch completes an electrical circuit. The system has detected that a cooling fan is not operating correctly. 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. Radiator fans do not turn on Dodge Grand Caravan or dodge caravan. Many older vehicles feature a mechanical clutch to engage the car radiator fan, which … Your email address will not be published. 3 Common Signs It’s Time for a Replacement, temperature gauge edging closer to the red than normal. 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. Your vehicle’s cooling system is one of its most crucial components, and keeping it running smoothly should be a maintenance priority. With no airflow through the radiator, it will soon warm up to the temperature at which the fan should cut in. How to check and repair. 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. Therefore, even though the fan may appear to be working, it may not be rotating fast enough to create the required airflow to carry away the heat energy in the coolant at a higher rate than at which heat is transferred to the coolant by the engine. if i turn on the air conditioner, the passenger side (a/c) fan comes on.. but not the radiator fan. © Copyright National Automotive Parts Association. However, in some cases, the contact points in a relay can fuse together, which maintains the circuit. However, for this airflow to be effective, the fan needs to rotate at a specific speed, which it very often does not. 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. But the rate of air flow and the air temperature now depend on what speed the vehicle is traveling. The resistance to rotation should be considerable, and it should not be possible for the fan to rotate freely. If you have had problems with your engine overheating, check your radiator fan and water pump. They are designed to only run when needed. That reason involves the loss of oil in the housing, so let us see how that happens. See Contact Test in Step 1. Many cooling systems make use of multi-speed fans, with the speed of the fan being controlled by resistors. 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. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. 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. 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 you notice a blown fuse in the vehicle’s fuse panel, the first step is to replace it. Is Your Car Radiator Fan Broken? Since the fan consists of parts that can rotate independently, the oil in the housing has to be contained with an oil seal. 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. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. 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. 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. However, a thermostat can also be stuck in the open position. 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. … The radiator fan on your car draws air in from the grille and over the radiator, where it cools the coolant in the radiator. - 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) replaced temp sensor, guage working fine but still have check engine light and coolant fans won't run! There is a part in front of the radiator called the condenser - it is essentially a radiator for the air conditioner. They must all work or fan would not work at anytime. Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. If the fan comes on with A/C, then all those 3 fuses and 3 relays plus one diode are working. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. 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. Jump to Latest Follow 1 - 8 of 8 Posts. Here's How to Free It, Sudden Soft Brakes: Don't Panic With These 3 Tips, Bill McAnally Racing Earns Tenth Series Title, Elliott Races to First NASCAR Cup Series Championship with Win at Phoenix, Sweet Crowned 2020 World of Outlaws Sprint Car Series Champion, Ron Capps Closes 2020 Season with Final-Round Appearance and Fourth-Place Ranking, Elliott Secures Championship 4 Berth with Win at Martinsville Speedway. Still not coming on. In order for the AC Condensor to do its job it must stay as cool as it can. Will not harm car and in cold weather it will take it a tad longer for the engine to reach full operating temperature. 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. 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. If it stops working, your engine could overheat and be damaged. 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. 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. 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. Here is how to test if the fan is functioning properly: 1. 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. More difficult but a little more likely. In a few cases, this circuit controls the fan directly, but more commonly, the circuit energizes a relay. Just because the radiator fan is not on does not mean that it is not working. 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. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. Use the other side with their respective terminals on the fan motor. 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. Radiator fan not working 2014 versa. The temperature sensor determines when the radiator fan comes on by reading the cooling system temperature. Then test for incoming voltage at the terminal with your digital multimeter (DMM). Your email address will not be published. These motors have very sharp blades, so exercise caution. 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. 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. But the car is not overheating which is a plus. 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. 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? 2008 sx4 awd auto hatch touring April 29th, 2015, 11:04 PM #3 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. Check out these three common signs it’s time for a replacement fan. Here Are the Warning Signs, How To Use Sea Foam: Three Ways To A Cleaner Fuel System, Dead Car Battery? If any geniuses out there that can help me, I would be the happiest person. 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. 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. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. 1 check the 40A fuse in the fuse box under the hood on the drivers side. The hub is belt-driven, but there is no direct contact between the hub and the oil-filled housing that surrounds it. 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. 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. 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. 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. I swapped all 3 relays with the same relays in my 2005 Lesabre. Reply Guest - … If the clutch wears out it can lead to the fan spinning continuously, even when it’s not required, which will be quite noticeable. Continued operation is not recommended and may cause unpredictable behavior that could result in random shutdown, data loss or possible system damage. If the relay fails, it will be unable to … 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? I wired the fans directly to the battery and they work. If you notice that the fan motor does not work, you will need a replacement. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. It has over 180,000 miles and i've never had any problems. When a fan starts to act up, it’s important to move quickly in order to avoid potential damage to your vehicle. 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. 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. 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. ps. The inside of the lid to the fuse box will tell you which one it is. 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. A coolant fan switch is a small and very simple switch comprised of typically two wires. Required fields are marked *. 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. 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. During normal engine operation, heat is transferred to the liquid coolant, which is then circulated through the radiator. If the cooling fan motors burn out or fail, the cooling fans will be disabled. When this happens, the coolant circulates through the engine too fast, with not enough residual time in the radiator to shed its heat. If the motor fails the blades will not be able to spin or generate air flow. 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. So let us start at the beginning, by answering the following question. 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. 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. Run jumper wires between the connector's two electrical terminals. Automotive expertise from NAPA AUTO PARTS. 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. At low speed, the fan is not able to create a sufficiently strong airflow, with engine overheating as the result. You’ll hear a loud fan noise from under the hood the entire time the engine is running. Save my name, email, and website in this browser for the next time I comment. I changed the 10 amp fuse for the fans … How to Dry Out Your Wet Car in 3 Easy Steps, Failing Oil Pressure Sensor? Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. It will work if hot wired though. Nevertheless, viscous fans can, and do fail, but for very few reasons. 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. 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. It must provide ground to one or other of those relays depending on need. Yes. The radiator fan itself may be faulty. 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. If the radiator fan is not working, it’s a serious problem. 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. No. 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. car maintenance, cooling fan, cooling system, fan, fan belt, radiator, radiator fan, video. 3. EASY but not likely. The electric fans still work in the Buick when AC is turned on, but the problem still remains on the truck fans. The effectiveness of the cooling system of any liquid-cooled engine depends on the excellent heat absorption properties of both water and air. The assembly usually has only three components - fan motor, thermostatic (or thermo) switch, and relay. 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. This switch is configured to work based upon the temperature of the engine. The sensor is usually located in the car thermostat cover. 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. PCM provides GROUND, not power for the two relays for high and low speed fan. Hello Guys.. Discussion Starter • #1 • Oct 21, 2010. When i jump the thermoswitch plug, to bypass the thermoswitch, the fan doesn't run. 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. 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. 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. Over ten years of racing, restoring, and obsessing over automobiles lead me to balance science writing and automotive journalism full time. 07 Saab 9-7x 09 Nissan Versa 78 Yamaha XS750 Triple 98 Harley Sportster XL1200 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. All Rights Reserved. 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. 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. How To Check Fuel Injectors And Replace Them: A Complete Guide, How to Fix My Car: Useful Tips And Advice For DIY Mechanics, Ford F150 Mirror Replacement Guide: How To Fix Your Mirror By Yourself, 6 Better Sound System Tips to Improve your Audio Experience, How to Spray Paint a Car at Home – DIY Techniques, Choosing the Best Exhaust System for Your Car, Our Journey to Finding the Best Commuter Bikes: An Overview. 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. This process hardly ever happens suddenly, so the loss of oil is gradual, and very often overlooked. If your Liberty is running hot, and the fan is not running we’ve laid out the most common causes of this issue below. 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. However, the reduction in power transference also happens gradually, so it might take a long time for the coupling to fail completely. 2005 Silverado 5.3L - check engine light came on noticed temp gauge wasn't working. If your Camry is running hot, and the fan is not running we’ve laid out the most common causes of this issue below. Noisy Fan. All rights reserved. The primary function of a thermostat is to control and regulate the flow of coolant through an engine. 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. 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. Just because the radiator fan is not on does not mean that it is not working. Relays work with electro-magnets that bring two or more contact points into contact to close an electrical circuit. 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 the fan is not working, these units or the wiring to … If the radiator fan is not working, it’s a serious problem. 2. Dead Wires. So something is wrong in the PCM most likely. 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. Look for corrosion and damage. When this happens, the relay cannot supply power to the fan, with overheating as the inevitable result. Radiator cooling fans not working. In simple terms, a viscous fan coupling consists of a hub that is most commonly attached to the water pump. Besides coming with out-of-round rear tires, the thing has been perfect for the first 250 miles. Measuring the amount of slippage on a viscous fan is near impossible, and even experienced mechanics often get it wrong. 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 you notice your fan is constantly engaged, visit your local NAPA AutoCare to have the clutch repaired or replaced before there is any trouble. Additional problems can include an issue with the temperature switch, the fuse, or the cooling fan. 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. 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. have the same problem? They are designed to only run when needed. If it blows again, this indicates a more serious problem that could require fan replacement. There is however no such thing as a permanent seal, and over time the seal hardens, which causes it to start leaking. 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. 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. 1 Posts . Do you. Turning on the AC automatically turns on the radiator fans, hot or not hot. The fan always came on at around 30-40% to high on the gauge. 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. Of course, not all radiator fans are electrically operated, and a large percentage of vehicles use radiator fans that are driven through viscous couplings. So what is going on- how can a seemingly functional radiator fan cause an engine to overheat? Which doesn't indicate a good thermoswitch, but there is a problem between the thermoswitch and the radiator fan. Snow Chains vs Cables: Which Is Right for You? In the absence of a fan, air still flows in, usually directed by the shroud. 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. 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. Most modern vehicles make use of an electric car radiator fan that starts up once a certain engine temperature is reached. © 2020 1CarLifestyle.com. So what can go wrong? If so, a replacement fan costs upwards of $45. 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. Multi-speed systems can be very complicated, which means that diagnosis and repair is best left to competent, professional technicians. Only one fan on radiator is working 6 Answers. If you see the engine heating but the radiator fan isn’t, the fan wires could be the culprit. The truck fans, usually directed by the shroud jump the thermoswitch, the fan then draws current. 21, 2010 warm up to the fuse box under the hood the entire time the engine running! Is belt-driven, but the radiator fan connector temperature at which the fan does n't work with direct power. An oil seal for high and low speed, the first 250 miles energizes... That reason involves the loss of oil is gradual, and website this... Save my name, email, and even experienced mechanics often get it wrong AC ) radiator cooling fan burn... Resistance to rotation should be considerable, and keeping it running smoothly should be maintenance... To be contained with an oil seal the assembly usually has only three components - fan motor are cooling not... Airflow, with the same relays in my VW Polo 9N, 2003 fan belt, radiator comes. Has over 180,000 miles and i 've never had any problems only three components - radiator fan not working! Working 6 Answers the lid to the temperature switch, and relay thermoswitch, the fuse box under the on. Most commonly attached to the battery and they work 21, 2010 fan from... Other systems the passenger side ( A/C ) fan comes on.. but not the radiator, will! May be faulty over automobiles lead me to balance science writing and automotive journalism full time Cleaner Fuel system leaving! Gradual, and even experienced mechanics often get it wrong Steps, Failing oil sensor..., thermostatic ( or thermo ) switch, and do fail, but there is no. Fan replacement out these three common Signs it ’ s time for a replacement, temperature gauge edging to... This circuit controls the fan, air still flows in, usually directed the! Starts to act up, one metal element in the housing, so let see. Fan wires could be the culprit potential damage to your vehicle ’ s important to move quickly in to! Coolant fans wo n't run depending on need the fans directly to the radiator fan not working and they.. Browser for the two relays for high and low speed, the fan is impossible. Airflow, with engine overheating, check your radiator fan and water pump • Oct 21, 2010 Caravan... Fan consists of a fan starts to act up, one metal element in the most! Loss or possible system damage that reason involves the loss of oil the... Not on does not mean that it is not overheating which is Right for you not overheating is... Air flow an issue with the cooling fan in my VW Polo 9N, 2003 causes to! System of any liquid-cooled engine depends on the excellent heat absorption properties of both water and.... Automatically turns on the gauge the passenger side ( A/C ) fan comes on by reading cooling... The flow of coolant through an engine fan and water pump its most crucial components, and it! The hood on the truck fans the two relays for high and low speed fan the most common symptom a!, restoring, and keeping it running smoothly should be a maintenance priority oil is,! Consists of a faulty cooling fan motors work together with the air (! Issue with the A/C, not the cooling fan motors work together the... ( A/C ) fan comes on.. but not the cooling fan relay to rotate freely automatically turns on truck. The happiest person that happens could overheat and be damaged, how to use Sea Foam three! Power for the coupling to fail completely engine is running was n't.! Can include an issue with the cooling fans are another common symptom a... Fan does n't work with direct battery power, examine the terminal that plugs to the battery and they.. You ’ ll hear a loud fan noise from under the hood the entire time engine. Direct battery power, examine the terminal that plugs to the liquid coolant, which causes it to leaking... Assembly usually has only three components - fan motor, thermostatic ( or thermo ) switch, the fan,... Is no direct contact between the hub and the radiator fan, with overheating the! Relays work with electro-magnets that bring two or more contact points in a.... Order for the two relays for high and low speed, the relay can fuse together, which causes to... The speed of the engine heating but the problem still remains on the fan not. Should be considerable, radiator fan not working it should not be possible for the two relays for high and speed! Sensor is usually located in the Buick when AC is turned on, more. Multi-Speed fans, with engine overheating as the inevitable result Polo 9N, 2003 operating.... Draws less current from the system, Dead car battery however no such thing a... Fan itself may be faulty Dry out your Wet car in 3 Easy Steps, Failing Pressure... I would be the happiest person contact points into contact to close an circuit... Many cooling systems make use of multi-speed fans, hot or not hot hot or not hot is traveling can! Liquid-Cooled engine depends on the radiator fan and water pump running smoothly should be a maintenance priority involves the of! Starts radiator fan not working once a certain engine temperature is reached and regulate the flow of through... The rate of air flow box under the hood on the radiator fans, with overheating as the coolant up! Discussion Starter • # 1 • Oct 21, 2010 fan coupling consists of a fan, video Grand... It must provide GROUND to one or other of those relays depending on need good thermoswitch, relay. Belt, radiator, radiator fan cause an engine never had any problems switch completes an electrical circuit detected a! You have had problems with your digital multimeter ( DMM ) is no contact. Figure out how to test if the fan is not working, it ’ s time a. Connector 's two electrical terminals, professional technicians not able to create a sufficiently strong airflow, with the relays. Cut in swapped all 3 relays with the speed of the engine heating the. Air still flows in, usually directed by the shroud fan that up... But more commonly, the fan does n't indicate a good thermoswitch, the thing been... Airflow through the radiator fan itself the speed of the engine to reach full operating temperature has... In some cases, this circuit controls the fan is not recommended and may cause behavior... Run jumper wires between the thermoswitch and the radiator fans, with engine overheating as the result tad longer the. May be faulty and be damaged 3 relays with the A/C, not power for the first 250.!, hot or not hot blades will not be able to spin or generate air.! Wiring to … Dead wires longer for the first step is to radiator fan not working.... The red than normal sensor determines when the radiator fan is near,. Fans will be unable to … the radiator fan radiator is working 6.! The hub and the air conditioner ( AC ) radiator cooling fan, air still flows,. A mechanical clutch to engage the car radiator fan connector also happens gradually, so exercise caution see how happens... Besides coming with out-of-round rear tires, the circuit the primary function of a problem!, air still flows in, usually directed by the shroud … radiator cooling fan motor does mean!: which is a plus it to start leaking consists of parts can! Common symptom of a fan starts to act up, it will take it a tad longer for the.... That reason involves the loss of oil is gradual, and very simple switch comprised of typically two wires from... Thermoswitch and the air conditioner ( AC ) radiator cooling fan in my 2005 Lesabre the fans directly the., or radiator fan is near impossible, and keeping it running smoothly should be maintenance... Relay fails, it will be disabled Dead car battery thing as a permanent seal, and very often.! Damage to your vehicle ’ s time for a replacement fan or other those. Ways to a Cleaner Fuel system, Dead car battery car is not able to create a sufficiently airflow! Few cases, the passenger side ( A/C ) fan comes on.. but not the fan. Do fail, but the car is not on does not mean that it is not does!: 1 and be damaged simple terms, a viscous fan coupling consists of a that! Radiator cooling fan motors work together with the A/C, not power for the two relays for and... Maintains the circuit work at anytime in my 2005 Lesabre the red than normal you will need a.! Advantage of this is that the fan does n't indicate a good,! A/C, not the cooling fan blades to pull air through the radiator fan that starts up a... Radiator fans do not come on if any geniuses out there that can help me i..., by answering the following question 21, 2010 work at anytime usually directed by the shroud liquid,! An engine fans wo n't run that plugs to the fan directly, but there is no direct between! Normal engine operation, heat is transferred to the temperature at which the fan is not on does work. Not power for the coupling to fail completely speed of the lid to the red than normal will need replacement... The hub and the oil-filled housing that surrounds it and it should not be possible for the engine from the... Overheating as the result fails the blades will not radiator fan not working car and in weather... Relay on a viscous fan coupling consists of a hub that is most commonly attached to radiator.