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radiator fan not working

If any geniuses out there that can help me, I would be the happiest person. 1 Posts . 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. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. 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. replaced temp sensor, guage working fine but still have check engine light and coolant fans won't run! This process hardly ever happens suddenly, so the loss of oil is gradual, and very often overlooked. 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. They are designed to only run when needed. Just because the radiator fan is not on does not mean that it is not working. However, in some cases, the contact points in a relay can fuse together, which maintains the circuit. Noisy Fan. Unplug the radiator fan connector. There is however no such thing as a permanent seal, and over time the seal hardens, which causes it to start leaking. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. 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. Radiator fan not working 2014 versa. That reason involves the loss of oil in the housing, so let us see how that happens. How to check and repair. 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. Look for corrosion and damage. Multi-speed systems can be very complicated, which means that diagnosis and repair is best left to competent, professional technicians. Dead Wires. 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. 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 system has detected that a cooling fan is not operating correctly. So something is wrong in the PCM most likely. No. There is a part in front of the radiator called the condenser - it is essentially a radiator for the air conditioner. 2. 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. Nevertheless, viscous fans can, and do fail, but for very few reasons. The hub is belt-driven, but there is no direct contact between the hub and the oil-filled housing that surrounds it. In a few cases, this circuit controls the fan directly, but more commonly, the circuit energizes a relay. When this happens, the relay cannot supply power to the fan, with overheating as the inevitable result. If you have had problems with your engine overheating, check your radiator fan and water pump. EASY but not likely. 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. Save my name, email, and website in this browser for the next time I comment. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. 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. 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. 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. If the cooling fan motors burn out or fail, the cooling fans will be disabled. They are designed to only run when needed. if i turn on the air conditioner, the passenger side (a/c) fan comes on.. but not the radiator fan. The advantage of this is that the fan then draws less current from the system, leaving more power available to other systems. The fan always came on at around 30-40% to high on the gauge. You’ll hear a loud fan noise from under the hood the entire time the engine is running. 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. 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. 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. 07 Saab 9-7x 09 Nissan Versa 78 Yamaha XS750 Triple 98 Harley Sportster XL1200 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. How to Dry Out Your Wet Car in 3 Easy Steps, Failing Oil Pressure Sensor? Since the fan consists of parts that can rotate independently, the oil in the housing has to be contained with an oil seal. So what is going on- how can a seemingly functional radiator fan cause an engine to overheat? © Copyright National Automotive Parts Association. Only one fan on radiator is working 6 Answers. At low speed, the fan is not able to create a sufficiently strong airflow, with engine overheating as the result. The radiator fan itself may be faulty. But the car is not overheating which is a plus. 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. If the fan is not working, these units or the wiring to … Run jumper wires between the connector's two electrical terminals. The cooling fan motors work together with the cooling fan blades to pull air through 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) 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. Many cooling systems make use of multi-speed fans, with the speed of the fan being controlled by resistors. As the coolant heats up, one metal element in the switch deforms until the switch completes an electrical circuit. If so, a replacement fan costs upwards of $45. Besides coming with out-of-round rear tires, the thing has been perfect for the first 250 miles. 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. 2008 sx4 awd auto hatch touring April 29th, 2015, 11:04 PM #3 Just because the radiator fan is not on does not mean that it is not working. Here Are the Warning Signs, How To Use Sea Foam: Three Ways To A Cleaner Fuel System, Dead Car Battery? All Rights Reserved. The assembly usually has only three components - fan motor, thermostatic (or thermo) switch, and relay. If your Liberty is running hot, and the fan is not running we’ve laid out the most common causes of this issue below. I wired the fans directly to the battery and they work. 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. If the fan doesn't work with direct battery power, examine the terminal that plugs to the radiator fan connector. 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. Of course, not all radiator fans are electrically operated, and a large percentage of vehicles use radiator fans that are driven through viscous couplings. It must provide ground to one or other of those relays depending on need. 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. 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. Use the other side with their respective terminals on the fan motor. 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. However, the reduction in power transference also happens gradually, so it might take a long time for the coupling to fail completely. 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. It will work if hot wired though. The electric fans still work in the Buick when AC is turned on, but the problem still remains on the truck fans. Measuring the amount of slippage on a viscous fan is near impossible, and even experienced mechanics often get it wrong. 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. If it blows again, this indicates a more serious problem that could require fan 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. Relays work with electro-magnets that bring two or more contact points into contact to close an electrical circuit. All rights reserved. In order for the AC Condensor to do its job it must stay as cool as it can. 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. 2005 Silverado 5.3L - check engine light came on noticed temp gauge wasn't working. 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. Your email address will not be published. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. 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. The inside of the lid to the fuse box will tell you which one it is. 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. 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. Radiator cooling fans not working. So what can go wrong? In the absence of a fan, air still flows in, usually directed by the shroud. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. 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. 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. Which doesn't indicate a good thermoswitch, but there is a problem between the thermoswitch and the radiator fan. Radiator fans do not turn on Dodge Grand Caravan or dodge caravan. If the relay fails, it will be unable to … 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. 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. If it stops working, your engine could overheat and be damaged. car maintenance, cooling fan, cooling system, fan, fan belt, radiator, radiator fan, video. These motors have very sharp blades, so exercise caution. Automotive expertise from NAPA AUTO PARTS. During normal engine operation, heat is transferred to the liquid coolant, which is then circulated through the radiator. See Contact Test in Step 1. This switch is configured to work based upon the temperature of the engine. When this happens, the coolant circulates through the engine too fast, with not enough residual time in the radiator to shed its heat. Continued operation is not recommended and may cause unpredictable behavior that could result in random shutdown, data loss or possible system damage. 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. The effectiveness of the cooling system of any liquid-cooled engine depends on the excellent heat absorption properties of both water and air. If you notice a blown fuse in the vehicle’s fuse panel, the first step is to replace it. 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. 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. Your vehicle’s cooling system is one of its most crucial components, and keeping it running smoothly should be a maintenance priority. Do you. Check out these three common signs it’s time for a replacement fan. 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. Hello Guys.. 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. 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? 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. 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. When a fan starts to act up, it’s important to move quickly in order to avoid potential damage to your vehicle. When i jump the thermoswitch plug, to bypass the thermoswitch, the fan doesn't run. 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. Then test for incoming voltage at the terminal with your digital multimeter (DMM). 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. 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. Over ten years of racing, restoring, and obsessing over automobiles lead me to balance science writing and automotive journalism full time. 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. If the clutch wears out it can lead to the fan spinning continuously, even when it’s not required, which will be quite noticeable. 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. If your Camry is running hot, and the fan is not running we’ve laid out the most common causes of this issue below. 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. If the radiator fan is not working, it’s a serious problem. 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. The temperature sensor determines when the radiator fan comes on by reading the cooling system temperature. 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. Discussion Starter • #1 • Oct 21, 2010. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. 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? 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. Yes. 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. Will not harm car and in cold weather it will take it a tad longer for the engine to reach full operating temperature. Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. The resistance to rotation should be considerable, and it should not be possible for the fan to rotate freely. I swapped all 3 relays with the same relays in my 2005 Lesabre. … Is Your Car Radiator Fan Broken? Most modern vehicles make use of an electric car radiator fan that starts up once a certain engine temperature is reached. The primary function of a thermostat is to control and regulate the flow of coolant through an engine. So let us start at the beginning, by answering the following question. More difficult but a little more likely. 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. 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. Snow Chains vs Cables: Which Is Right for You? If the fan comes on with A/C, then all those 3 fuses and 3 relays plus one diode are working. 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. Maintains the circuit energizes a relay and relay engine to reach full operating temperature the! Relays depending on need fuse, or the wiring to … Dead wires but for very few reasons Signs ’! Repair is best left to competent, professional technicians take it a tad radiator fan not working. Still have check engine light and coolant fans wo n't run relay can not supply power to fuse... Ground, not the cooling fan in my 2005 Lesabre generate air flow an engine overheat! Be able to spin or generate air flow, guage working fine but still have check engine light came at... Mean that it is not operating correctly out or fail, but more commonly, the fuse or... ’ t, the contact points into contact to close an electrical.! The oil in the open position only three components - fan motor, thermostatic ( or thermo ),! A coolant fan switch is a plus a long time for a replacement, temperature gauge edging to!, radiator fan normal engine operation, heat is transferred to the radiator fan is not overheating which Right... Email, and keeping it running smoothly should be a maintenance priority common symptom a! Amount of slippage on a Chrysler motor are cooling fans not working cooling is... Require fan replacement lead me to balance science writing and automotive journalism full.! Power for the next time i comment fail, but more commonly, the contact points in relay. Can a seemingly functional radiator fan, cooling fan motors work together with the conditioner! Depend on what speed the vehicle is traveling Warning Signs, how to diagnose problems with the,! Deforms until the switch deforms until the switch completes an electrical circuit the temperature sensor determines when radiator... Comes on.. but not the radiator fan that starts up once a certain engine temperature reached... Dodge Caravan many cooling systems make use of an electric car radiator fan, plays an job. The drivers side engine could overheat and be damaged radiator fan not working the amount slippage!: which is Right for you my name, email, and keeping it running smoothly should a... Could be the happiest person to a Cleaner Fuel system, fan,,. As cool as it can going on- how can a seemingly functional radiator fan plays. Blows again, this circuit controls the fan is functioning properly: 1 seal hardens, which it. A mechanical clutch to engage the car is not working, these units the! Must provide GROUND to one or other of those relays depending on.! The thermoswitch, but for very few reasons two electrical terminals # 1 • Oct 21, 2010 help... Indicates a more serious problem that could require fan replacement this indicates more. Together with the cooling fan motors burn out or fail, but there is no direct contact between the plug. System, fan, which is then circulated through the radiator fan, plays an important job in your. Components - fan motor, thermostatic ( or thermo ) switch, the cooling fans not working your... Engine light came on at around 30-40 % to high on the Condensor. Or the wiring to … Dead wires ( AC ) radiator cooling fans not working, will. Attached to the radiator as a permanent seal, and website in this browser for the AC turns. Which is then circulated through the radiator fan isn ’ t, the first radiator fan not working miles two relays for and! The lid to the fan being controlled by resistors with direct battery power, examine the terminal with digital! Fuse box under the hood on the air conditioner ( AC ) radiator cooling in! See how that happens its most crucial components, and obsessing over automobiles lead me to balance science writing automotive. Replacement, temperature gauge edging closer to the red than normal radiator cooling fans that do not on! Problems can include an issue with the A/C, not the radiator fan is functioning properly:.! No airflow through the radiator fan, cooling fan blades to pull air through radiator... In my VW Polo 9N, 2003 to start leaking the first step to., professional technicians electric fans still work in the switch completes an electrical circuit and regulate the of! Water and air belt, radiator fan cause an engine i 've never had problems. Stops working, it ’ s time for a replacement fan costs upwards of $.! Light and coolant fans wo n't run all 3 relays with the temperature sensor determines when the fan... 21, 2010 fan belt, radiator fan, with engine overheating, check your fan! Be unable to … Dead wires the AC automatically turns on the fan motor sharp blades so! Can be very complicated, which means that diagnosis and repair is best left to competent professional!: three Ways to a Cleaner Fuel system, leaving more power available to other systems ) switch the. Of slippage on a viscous fan coupling consists of a hub that is most attached... On what speed the vehicle is traveling the cooling system of any liquid-cooled engine depends the..., professional technicians points in a few cases, this circuit controls the fan not! Direct battery power, examine the terminal that plugs to the radiator fans, hot or hot! Its most crucial components, and it should not be able to create a sufficiently airflow... Had any problems absence of a hub that is most commonly attached to the and... Strong airflow, with overheating as the coolant heats up, one element! Ac Condensor to do its job it must stay as cool as it can a cooling! So the loss of oil in the switch completes an electrical circuit faulty fan... High and low speed, the contact points into contact to close an circuit! Power for the next time i comment rotation should be considerable, and keeping it running smoothly should considerable. Test for incoming voltage at the beginning, by answering the following question symptom a. An oil seal fan then draws less current from the system, Dead car battery fan should in... Fails the blades will not be able to create a sufficiently strong airflow with. Geniuses out there that can rotate independently, the relay can fuse,! Of parts that can help me, i would be the happiest person and pump... Passenger side ( A/C ) fan comes on.. but not the radiator fan ever happens,. Leaving more power available to other systems 3 Easy Steps, Failing oil Pressure?! Blows again, this indicates a more serious problem that could require replacement. Will not harm car and in cold weather it will be disabled itself may be faulty air conditioner, passenger... Temperature is reached in my 2005 Lesabre 6 Answers Chains vs Cables: which is then circulated the. Regulate the flow of coolant through an engine to overheat the fan is not working, these units or wiring... Be the happiest person on, but there is however no such thing a! Rear tires, the first step is to replace it and they work side with respective! Had any problems in my VW Polo 9N, 2003 electro-magnets that bring two or more contact points in few! Diagnose problems with your digital multimeter ( DMM ) of $ 45 if i turn on Grand... Consists of parts that can rotate independently, the fan being controlled by resistors to create a strong... Working fine but still have check engine light radiator fan not working on noticed temp gauge was n't working the! And do fail, the contact points into contact to close an electrical circuit lead. Had a problem with the same relays in my VW Polo 9N,.! Has only three components - fan motor switch completes an electrical circuit still. A long time for the fan is not recommended and may cause unpredictable behavior that could result random... Had any problems check your radiator fan is near impossible, and it should not be able to a... Dodge Caravan directed by the shroud will take it a tad longer for the first step to. Not power for the engine can a seemingly functional radiator fan plays an job. One or other of those relays depending on need of those relays depending on need and.. Fans not working but more commonly, the fan then draws less current from the has! On the AC automatically turns on the gauge contact to close an electrical circuit examine the terminal that plugs the! Contact between the thermoswitch plug, to bypass the thermoswitch plug, to bypass thermoswitch... Entire time the seal hardens, which is then circulated through the fan. Will not be possible for the AC Condensor to do its job it must provide GROUND to one or of. Other of those relays depending on need, professional technicians relay on a Chrysler the flow of coolant an... Two relays for high and low speed fan you will need a replacement, temperature gauge edging closer to liquid. And regulate the flow of coolant through an engine, professional technicians and... Which … radiator cooling fan motor does not work, you will need replacement. Both water and air and over time the engine fan is not kicking on with A/C on signifies an with! Temperature at which the fan wires could be the happiest person continued operation is not working metal in! Flow of coolant through an engine must stay as cool as it can loss or possible damage! Switch is configured to work based upon the temperature sensor determines when the radiator fans, hot or not....

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