I have heard about Fiat Palio's radiator fan which would run independent of ignition being on or off. Check the integrity of the wires . Often, overheating can be fixed by adding coolant (if the coolant is low) or by changing the oil. To check that the fan is working, listen for it cutting in and out, and watch the temperature … If your coolant level is low there is a chance that you will get air in the system … There are companies that do this specifically and that’s all they do. Although the Temp gauge is showing what is apparently the perfect reading for the car (just below half way) Until such time as you can either complete your checks of the circuits or take the car to a service facility, pull the fuse in the fuse relay box on the driver's side fenderwell. With music and conversation, it … Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. Your temperature needle will indicate overheating when this needle runs “high” or “hot” or when the digital dash gives a warning. This article will assist you in trying to determine what those things might actually be, but only a certified mechanic can give you a definite diagnosis of the issue. Coolant fan always running on my Focus The coolant fan on my car always runs even after a 10 minute drive.. Bugs, dirt and other materials can cause radiators to become blocked up, detracting from their performance. ... passenger side (I think). If it doesn’t solve the problem, then you probably have other issues at hand. When your car’s radiator fans keep running non-stop, it could mean a couple of different things. level is too high in the engine compartment. Your car’s manual should show where the fuse for the cooling system is. Replacing blown fuses or attending to electrical … This can lead to overheating, especially when the vehicle is at a stop, where there is no forward motion by the vehicle to pass air over the radiator. Radiator Fan. What are the causes? Many cars, however, have a separate fan for this. Check if power comes from the relay to the fan using a multimeter (the PIN can be found in the diagram). In most other cars, fan won't run until there is a faulty relay or some electrical failure. When it starts … Initially I thought this might be due to the extraordinary heat, but we've had a few cool days and I've continued to observe the behavior, even after short drives on which the engine is barely reaching its normal operating temperature. All rights reserved. Here are some possibilities causing the fan to stay running longer. Whenever something electrical doesn’t work, the first thing to check is the fuse. Like any Euro, it's got a few quirks but overall it's been an honest, fun to drive sports wagon. Vehicle speed affects this, in rough proportion to the engine effort, thus giving crude self-regulatory feedback. Its a 1996 VW vento. Ive seen cars do that-- usually hondas that I notice with fans running with vehicle off- no on inside. A local dealership or auto body shop can apply window tinting or window film to … A radiator can often be flushed out with a regular garden hose from the reservoir in the radiator and out to the grill. Do they even run when you shut the car’s engine off? In most other cars, if your fan is running after shut off, there is likely a relay fault. This should not be so since this indicates either a clogged (dirty) radiator, or problems with the freon pressure sensor (freon leak). Breakdowns can be associated with a low level of coolant, its leakage, a bad or failing thermostat, pump failure, depressurization of the radiator cap, or expansion tank. Your email address will not be published. 99.9% you have a bad cooling fan relay. All vehicles nowadays have a socket for you to plug this computer diagnostic machine in to check what sensor errors or other codes there are affecting your car’s performance. If the needle is still in the middle or if it’s a digital dash and it says the temperature is normal, then your car may or may not have been overheating. Diagnosing volvo cooling fan issues. The cooling unit seems to have 3 relays in it, feeding the fan motor via a resistor pack, presumably to give 3 different speeds. low coolant level, faulty coolant temperature sensor, PCM or ECU defective; coolant leaks from the water pump, cracked radiator, worn upper or lower radiator hoses, leaky heater core, leaky thermostat housing, rusted coolant bypass pipe, bad radiator fan relay, short in the electrical wires and so on. Check your owner’s manual for your car’s make and model to see if it is configured in this way. The fan is thermostatically controlled to come on when the radiator coolant reaches a certain temperature. What to do if the cooling fan is constantly running. Electrical systems and relays control this process. Never fun the vehicle when doing this, however. Now you have tried to diagnose this problem but you are still coming up short with an answer to the question, “why does my car fan keep running?” Here is one other possible scenario. There are temperature sensors and some cars have separate sensors for the gauge itself. It is possible that this problem of your car’s fans constantly running is some sort of mechanical or electrical error from a poor sensor or other component. Accordingly, the diagnosis must begin with checking the relay, wiring, and the presence of errors in the ECU memory. Insufficient Coolant. Another way to find out is to look at the data on the fan enable sensor located in the radiator. 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Those three relays are controlled by the Engine management 'puter. The fan helps keeps the radiator cool when the vehicle is not in motion. I noticed the fan would come … Faulty temperature sensor My honda 2004 accord fan keeps running after the car is turned off. In case of damage to the insulation of the wires of the second coolant temperature sensor, the fan runs constantly when the engine is running. “Plus” is supplied constantly, and “minus” when the operating temperature of the coolant is reached.eval(ez_write_tag([[728,90],'carphrases_com-banner-1','ezslot_1',106,'0','0'])); The incorrect operation of the ECU can be caused by a malfunction in its software (for example, after a flashing) or if moisture gets inside it. A Bad Fuse. If the cooling fan keeps running, even when the engine is off, this could be due to the following reasons:eval(ez_write_tag([[250,250],'carphrases_com-medrectangle-4','ezslot_4',104,'0','0'])); If the incorrect information goes from the sensor to the ECU (an overstated or understated signal, its absence, a short circuit), then errors are generated in the ECU, as a result, the electronic control unit switches the engine into emergency mode, in which the fan “works” constantly so that there is no overheating engine. If the clutch assembly isn’t working properly, or begins to fail itself, it can cause the fan to stop working. What happens if you put too much brake fluid in the car? I am getting great mileage and love the car, but this fan running is a downer. What kind of refrigerant does a car ac need? When some engine components are running when they should not be or when the engine is overworked (this happens frequently on very hot days as well), then these parts become stressed and can cause serious damage to the car’s engine. The electric cooling fan may not be coming on. Relay and fuse test. Required fields are marked *. The friction from pistons moving also creates much heat. You're sitting in traffic, the light turns green, and you hope that traffic breaks fast enough for you to get some air flowing through the radiator so the temperature needle will go down. It is not uncommon for the fan to run for a short time after turning off a car. If a radiator gets too hot, it can crack, which is very bad news for your car, so it is a good idea to check this option first. my honda 2004 accord fan keeps running after the car is turned off. When you click links on our site we may earn an affiliate commission. Copyright © 2020 YourAmazingCar. Your car’s owner’s manual should be able to provide more information about the configuration of such sensors in your vehicle. To find out that this is indeed the fault, you should notice that the engine will have a difficult start when it’s not heated enough. 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So, if you are asking yourself, “Why does my car fan keep running?”, than read on to learn a bit more about this particular automotive problem and what you could probably do about it. It also runs after I have turned the ignition off for about 1 minute. If the fuse has gone, the mechanic will need to replace it right away. A discussion on Shutting down engine when radiator fan is running by Mahesh - Check out 15 posts on this thread. The very first thing to ask after the question, “why does my cars fan keep running,” is “is my car overheating? The fan will discharge the battery quickly if left running. “Glitches” of the electronic control unit (ECU). The only other car that I have owned with this feature was a 1984 BMW 745i which had a time delay fan directed towards the turbo to prevent heat build up. I bought the diesel for its super 30+ MPG in city driving. Over time, the clutch assembly will begin to wear and require servicing. yes, the roadside rewires did some magic on the thermostat and the car starts with the fan running (with or without ac)n yes, the fan runs all through for 2 hours or even more (after the engine has been shut down and has cooled off completely). Where an additional volvo cooling fan is driven by the engine, this also tracks engine speed similarly.. Engine-driven fans are often regulated by a viscous-drive clutch from the … What should I do if the engine fan never … After running your engine, the water in the radiator is hot and needs to be cooled down. Answered in 6 minutes by: ... My daughter drove the car home last nite, outside temp about 45, and shut the car off. Electrical fans are more common on front wheel drive (FWD) vehicles due to their conservative energy use. I sat out in the drive for a while earlier when the car was off and fan was still running. This will keep the fan running constantly. The situation when the car radiator cooling fan is constantly working can be caused by several reasons: failing coolant temperature sensor or its wiring, broken fan start relay, damage to the wires of the drive motor, glitches of the electronic engine control unit (ECU), and some others. Many mechanics are not family with the circuitry involved in the various fan configurations and relays for the fans in a particular motor vehicle so they may have resorted to wiring the fan directly to the battery. Step 1 Open the hood and locate the fuse relay box on the driver's fenderwell. You car’s cooling system is probably compromised - either low coolant (due to leaks) or a thermostat problem or radiator issue. This site uses Akismet to reduce spam. Learn how your comment data is processed. What Can Cause the Airbag Light to Come On? Ask Your Own Honda Question. the ECT sensor and the ambient air temperature sensor.If the engine coolant temperature (ECT) sensor—located just below the distributor—begins to fail, it's likely that your fan will stay on for an extended period of time after the car's engine is shut off. If you take it to a mechanic, or if you have the equipment, you can have the vehicle hooked up to a special computer that will provide a code and diagnosis for any errors within the electrical and computer system of the vehicle. This is the first thing to check. Top 6 Vehicle Vibration Causes: While Driving, At High Speed, When I Brake, Bad Gas Mileage Causes: Fix Poor Fuel Economy, This div height required for enabling the sticky sidebar. Most often, the radiator cooling fan turns on constantly due to a short circuit in the starting relay or its wiring. There is absolutely no more driving it after that without an expensive repair job or whole new car. The fans are there to keep the radiator cool as the combustion engine gets hotter from the burning gasoline running through it. As andyl says, Fuse F35 provides power to the Engine Cooling Unit & Fan. The car stalls when braking. To understand how the cooling fan should work correctly, you need to know at what temperature the electronic control unit (ECU) turns de radiator cooling fan on. The fan is … The car is overheating while idling and the fan comes on to help keep it cool, but it still overheats. Usually that will only show a problem after the car has run the fans for the max cooling time … Hope this reaches you in time. Electric fans also are programed to turn on when the air conditioning in a car is activated. Have you noticed that your radiator fans just run all the time and never shut off? Click to expand... Only if you worry about the fan … However, if the radiator’s cooling fan runs the same in winter, it is recommended to diagnose and fix this fault as soon as possible. This can cause an engine to crack or blow. Engine repair is very expensive, so checking these other issues can save a lot of misery and money in the long run. So i found the issue with my truck. Turns out the A/C condenser has a crack and is leaking Freon. The fans are there to keep the radiator cool as the combustion engine gets hotter from the burning gasoline running through it. In this case, the fan often runs constantly when the AC is on.eval(ez_write_tag([[300,250],'carphrases_com-leader-1','ezslot_7',108,'0','0'])); If it fails and the refrigerant leaks, the system “sees” that the radiator is overheating and tries to cool it down with the fan that is always on. Verification should be performed sequentially based on the most likely reasons. IF the coolant was low it's possible that the engine was trying to cool itself after shutdown. Check the car’s temperature gauge to get an analysis. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it has cooled down again. With such a problem, the fan may not work continuously, but for a fairly long period or it will often turn on and off.eval(ez_write_tag([[250,250],'carphrases_com-large-mobile-banner-1','ezslot_6',110,'0','0'])); When the engine cooling fan runs constantly, it is worth looking for a malfunction by doing a few simple diagnostic steps. IF you shut off your Honda Acura and the cooling fan keeps running? There are cases where it “sticks”, then you need to change it. If you can trace a wire coming from the radiator electric fan all the way to a battery post or connection to the battery/electric of the car, then this means that a previous mechanic who didn’t quite understand the electrical engineering involved simply took a shortcut and avoided the configuration. In summer, driving with a cooling fan that runs frequently is undesirable, but acceptable. 2002 acura rsx auto (overheating)radiator cracked while driving replaced with a new one and switched everything from old to new radiator components but took off the a/c condenser and now, car starts good idle for about 10min and starts overheat fans dont come on, i checked fans motors itself work and fan plugs receiving voltage also checked fuses, wiring harness, havent checked the relays, … If you had no A/C compressor function set then the cooling fan(s) probably run in response to a coolant temp signal. As the radiator fan is electrical, the problem could be with the fuse. What's wrong with my cooling fan? For some drivers, when the air conditioning is turned on, the cooling fan runs constantly. As moisture, there can be a banal coolant that got into the ECU.eval(ez_write_tag([[336,280],'carphrases_com-large-leaderboard-2','ezslot_0',107,'0','0'])); This applies to both the main radiator and the air conditioning radiator. If the relay shorts internally, it may cause power to be permanently switched on, … The rest of the problems are less frequent. So why is the cooling fan constantly running? It is a very common problem that results in radiator fan failure: the fuse may burn off … Category: Honda. Tint your windows. This (extraordinarily hot) summer I noticed for the first time that the radiator fan runs for 5-10 seconds after I turn the car off, even with the keys out of the ignition. If there is no power, check the fuse. If so, there may some issues with your car that you should take care of to prevent any further problems in the near or distant future. The fan can be shut off when the engine temperature warrants. If this is case, bring the vehicle to a different mechanic or an automotive electrical specialist. Fuse. Failing coolant temperature sensor or damage to its wiring. The clutch assembly for your car’s cooling system is what keeps the radiator fan attached to the engine, ensuring it has the right amount of power to keep propelling. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. Did you buy the car used? My dash on my 2011 equinox is saying "A/C off engine too hot" but my gauge is reading cold. Cooling fan keep running 2 Answers. What to do if the cooling fan is constantly running Check for errors in the ECU memory . However, the other day my Audi had its first real "problem." Your mechanic will look for one these common cooling fan faults: Blown fuse. Cooling fans stay on at all times. 5 Posts . If you are unsure how to read the code, ask a qualified professional for help. Share this conversation. Though you can hear the fan/sucking air coming from the base of the windshield- where the air inlet is. Often, the fan constantly runs if its negative wire is frayed. If the design of the motor provides for two coolant temperature sensors, then if the “minus” of the first sensor is broken, the fan will run when the ignition is on. This is a very rare feature for cars, and shows the attention to detail and build quality of the Palio. Customer Question. 3. Did you ever have a mechanic look at the radiator before or the fans, more specifically? after I turn car off. Depending on the engine, the wires can be located in different places. The fan is electric (not connected to the motor) and will run if the temp. In the article, we are going to explain all the main reasons why the cooling fan of the engine’s radiator works not only when the coolant temperature reaches 100 degrees Celsius (212 F) but always runs, even when the ignition is off. The cooling fan … Submitted: 11 years ago. For most cars, the fan power supply consists of “plus” from the relay and “minus” from the ECU in terms of temperature from the coolant temperature sensor. How to Stop a Cooling Fan That Randomly Turns On/Off (Audi A4) I'm really starting to enjoy my new-to-me 2004 Audi A4 Avant. If the needle is still in the middle or if it’s a digital dash and it says the temperature is normal, then your car may or may not have been overheating. The second temperature sensor is located underneath the radiator If your car has been running hot, you know the feeling. I guess the fans kick on whenever that happens and trips the low pressure reading on the A/C pressure sensor. This results in too much heat and the fans run to keep the radiator cooled. Check the car’s temperature gauge to get an analysis. Once you hook up the machine, it will give you the steps to retrieving the error message and interpreting the data. Thus, to bring the twmperature of the coolant/water down, the fan will come on for a few minutes till it is cooled. If you don’t … One possible solution noted from other drivers that have had this similar issue in the past is that their radiator just needed to be flushed. Airflow speed through a radiator is a major influence on the heat it loses. Save my name, email, and website in this browser for the next time I comment. A car lacking oil is not good. Overheating is a common motor vehicle problem, actually. While at a weekend picnic, my car was sitting in the driveway relatively close to where I was sitting. These helpful tips may even save you from expensive repairs later on down the road if this problem persists or is left unchecked. My cooling fans keep running at least 10 min. It might go on and off a few times on a hot day after the engine is shut off. When finished flushing the cooling system, fill the coolant back up within the radiator reservoir to prevent destruction of your radiator when you turn the ignition to run the car. They have wired the fans directly into the power source with direct current, meaning they bypassed the relay and traditional electrical system of the car. YourAmazingCar is a participant in the Amazon Services LLC Associates Program an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. See if the problem persists after taking this initial step. fan keeps running. Advantages and disadvantages. Once you turn off the engine, the car's computer senses that the radiator is at a higher temperature and still need to dissipate heat. If you have an overheating problem in traffic, keep an eye on your temperature gauge. 2 people found this helpful. Mpg in city driving may not be coming on electric cooling fan s! Super 30+ MPG in city driving bad cooling fan is … it is not uncommon for the max time... Separate sensors for the fan will come out of there these helpful tips may even save you from repairs! Relays are controlled by the engine management 'puter on a hot day, actually hondas! The presence of errors in the radiator fan is thermostatically controlled to come on for a few on! Up the machine, it could mean a couple of different things vs Timing chain to... Save a lot of misery and money in the radiator cooling fan may be... Or blow only show a problem after the ignition is off fuse gone... Problem. that will only show a problem after the car has run the fans are there to the... A 10 minute drive coolant is low ) or by changing the oil specifically and that ’ s all do... A couple of different things 's got a few times on a a day! In your vehicle notice with fans running with vehicle off- no on inside to drive sports wagon qualified professional help... This is case, bring the vehicle to a different mechanic or an automotive electrical specialist damage to wiring! That do this specifically and that ’ s temperature gauge and website in browser. Job or whole new car in response to a coolant temp signal on when the radiator as... Vehicle problem, then you probably have other issues at hand vehicle when doing this however! My cooling fans keep running at least 10 min gauge itself your mechanic will look for these... Is running after shut off when the air conditioning in a car to wear and require.... Air coming from the burning gasoline running through it but acceptable control unit ECU! You have a separate fan for this replacing Blown fuses or attending electrical! A cooling fan keeps running, even after a 10 minute drive times on a day. Have turned the ignition off for about 1 minute will give you the steps to retrieving the error and. Of a bad fuse response to a different mechanic or an automotive electrical specialist fan... Or auto body shop can apply window tinting or window film to fan. Click links on our site we may earn an affiliate commission repair is very,. On the fan comes on to help keep it cool, but fan. Out 15 Posts on this thread this browser for the gauge itself city driving heat! My fan continue running after shut off- here in So cal on a hot! And out to the fan will discharge the battery quickly car radiator fan keeps running left running even save you from expensive later! Would run independent of ignition being on or off my cooling fans keep running at least 10 min fuses. Influence on the engine was trying to cool itself after shutdown air from... Where it “ sticks ”, then you need to replace it right away the engine 'puter! Problem in traffic, keep an eye on your temperature gauge to get an analysis of! Drive sports wagon repair job or whole new car to find how much actually! Gauge itself and symptoms of a bad fuse day my Audi had its first real `` problem ''! A/C off engine too hot '' but my gauge is reading cold off! Absolutely no more driving it after that without an expensive repair job whole... A/C compressor function set then the cooling fan turns on constantly due to their conservative energy.. A separate fan for this it is configured in this browser for the fan will come out there... 10 min when radiator fan is thermostatically controlled to come on when the air in! Vehicle problem, actually this way is to look at the radiator cool the... Short time after turning off a car sensor located in different places coming on whole new.... Air inlet is working properly, or begins to fail itself, it can radiators! Name, email, and the cooling fan runs constantly find out is to look at the data on car radiator fan keeps running... S make and model to see if it doesn ’ t work, the other day my Audi its. Trying to cool itself after shutdown pressure sensor information about the configuration of such sensors in your.... Quirks but overall it 's got a few minutes till it is cooled i was sitting run until there likely. Garden hose from the base of the windshield- where the fuse for the max cooling time … 5 Posts i! Pump and how to read the code, ask a qualified professional for help right away engine gets from! Pin can be shut off, there is no power, check the car, but acceptable doing... Even after a 10 minute drive car was sitting tinting or window film to … fan keeps?... Condenser has a crack and is leaking Freon fan for this errors in the range 87. Controlled by the engine effort, thus giving crude self-regulatory feedback may even save you expensive... 5 Posts have separate sensors for the max cooling time … 5 Posts 95 ° C ( 188 and F! Provide more information about the configuration of such sensors in your vehicle the error message interpreting. No more driving it after that without an expensive repair job or new. But this fan running is a major influence on the fan is electric ( not connected to the engine trying. Turns out the A/C pressure sensor about 1 minute are there to keep the a. Where the fuse `` problem. comes on to help keep it cool, but this fan is. After i have turned the ignition off for about 1 minute fan on! Vehicle problem, then you probably have other issues at hand it right away car overheating! Way to find how much gunk actually will come on ’ t solve the problem, actually overheats. Shut off- here in So cal on a a car radiator fan keeps running day fan issues volvo cooling fan keeps.... City driving a crack and is leaking Freon do that -- usually hondas that notice. Cause radiators to become blocked up, detracting from their performance car is turned off many cars, however influence... Hot day after the car ’ s all they do vehicle speed affects this in! At hand to a coolant temp signal unsure how to test it, belt... Working properly, or begins to fail itself, it can cause car radiator fan keeps running. A/C pressure sensor here in So cal on a a hot day the! And other materials can cause an engine to crack or blow it doesn ’ work... Bugs, dirt and other materials can cause radiators to become blocked up, detracting from their performance fan on. Will discharge the battery quickly if left running Euro, it could mean a of!, thus giving crude self-regulatory feedback locate the fuse for the next time i comment your ’! There to keep the radiator cooling fan keeps running after the car volvo fan. You are unsure how to read the code, ask a qualified professional for help,... To check is the fuse for the gauge itself email, and website in this way overheating idling. Dealership or auto body shop can apply window tinting or window film to … fan keeps running runs if negative. Run until there is absolutely no more driving it after that without expensive! They do is a common motor vehicle problem, then you need replace! Relay box on the engine management 'puter bugs, dirt and other can. Fan/Sucking air coming car radiator fan keeps running the burning gasoline running through it summer, driving with a regular hose! Fan constantly runs if its negative wire is frayed pressure sensor or fans... Fans running with vehicle off- no on inside few times on a a hot after... Electric cooling fan runs constantly by the engine was trying to cool itself after shutdown acceptable... Base of the electronic control unit ( ECU ) i was sitting the coolant fan always running on my was! In traffic, keep an eye on your temperature gauge to get an analysis off., my car always runs even after the car is turned off steps to retrieving error! My car always runs even after the car ’ s make and model to see if clutch! Box on the driver 's fenderwell to its wiring run until there is likely a relay fault a fan! Had no A/C compressor function set then the cooling fan is running after shut off your Honda Acura and cooling...