The fan will discharge the battery quickly if left running. Cooling fan keep running 2 Answers. Failing coolant temperature sensor or damage to its wiring. Replacing blown fuses or attending to electrical … 3. If this is case, bring the vehicle to a different mechanic or an automotive electrical specialist. Hope this reaches you in time. Check if power comes from the relay to the fan using a multimeter (the PIN can be found in the diagram). Your temperature needle will indicate overheating when this needle runs “high” or “hot” or when the digital dash gives a warning. When your car’s radiator fans keep running non-stop, it could mean a couple of different things. Most often, the radiator cooling fan turns on constantly due to a short circuit in the starting relay or its wiring. I bought the diesel for its super 30+ MPG in city driving. Electric fans also are programed to turn on when the air conditioning in a car is activated. 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. 99.9% you have a bad cooling fan relay. The fan helps keeps the radiator cool when the vehicle is not in motion. What happens if you put too much brake fluid in the car? It is a very common problem that results in radiator fan failure: the fuse may burn off … Re: Radiator Fan keeps running, even after the ignition is off! So why is the cooling fan constantly running? 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. Check the car’s temperature gauge to get an analysis. Faulty temperature sensor You car’s cooling system is probably compromised - either low coolant (due to leaks) or a thermostat problem or radiator issue. Bugs, dirt and other materials can cause radiators to become blocked up, detracting from their performance. In summer, driving with a cooling fan that runs frequently is undesirable, but acceptable. 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. The friction from pistons moving also creates much heat. Have you noticed that your radiator fans just run all the time and never shut off? Submitted: 11 years ago. “Glitches” of the electronic control unit (ECU). Insufficient Coolant. The rest of the problems are less frequent. If you had no A/C compressor function set then the cooling fan(s) probably run in response to a coolant temp signal. Ask Your Own Honda Question. Your car’s owner’s manual should be able to provide more information about the configuration of such sensors in your vehicle. A discussion on Shutting down engine when radiator fan is running by Mahesh - Check out 15 posts on this thread. This is a very rare feature for cars, and shows the attention to detail and build quality of the Palio. If you are unsure how to read the code, ask a qualified professional for help. 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. 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. So i found the issue with my truck. What should I do if the engine fan never … 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. If there is no power, check the fuse. What kind of refrigerant does a car ac need? Over time, the clutch assembly will begin to wear and require servicing. 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. Engine repair is very expensive, so checking these other issues can save a lot of misery and money in the long run. 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. 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. 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. Whenever something electrical doesn’t work, the first thing to check is the fuse. Depending on the engine, the wires can be located in different places. Relay and fuse test. As the radiator fan is electrical, the problem could be with the fuse. ... passenger side (I think). Your car’s manual should show where the fuse for the cooling system is. Electrical fans are more common on front wheel drive (FWD) vehicles due to their conservative energy use. 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. 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. There are temperature sensors and some cars have separate sensors for the gauge itself. Learn how your comment data is processed. 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. Though you can hear the fan/sucking air coming from the base of the windshield- where the air inlet is. 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. Problems and symptoms of a bad or failing fuel pump and how to test it, Timing belt vs timing chain. 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. 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. I am getting great mileage and love the car, but this fan running is a downer. Those three relays are controlled by the Engine management 'puter. My dash on my 2011 equinox is saying "A/C off engine too hot" but my gauge is reading cold. The fans are there to keep the radiator cool as the combustion engine gets hotter from the burning gasoline running through it. In most other cars, fan won't run until there is a faulty relay or some electrical failure. Verification should be performed sequentially based on the most likely reasons. I sat out in the drive for a while earlier when the car was off and fan was still running. Radiator Fan. Your mechanic will look for one these common cooling fan faults: Blown fuse. my honda 2004 accord fan keeps running after the car is turned off. A car lacking oil is not good. 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Although the Temp gauge is showing what is apparently the perfect reading for the car (just below half way) 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. 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). Another way to find out is to look at the data on the fan enable sensor located in the radiator. 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. Accordingly, the diagnosis must begin with checking the relay, wiring, and the presence of errors in the ECU memory. Your email address will not be published. What are the causes? 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