10 Smart Tips! How is this possible when the engine isn’t even running and the engine is cold. Should the radiator fan come on when the car starts? Again, the HVAC is off. If the fuse has gone, the mechanic will need to replace it right away. If your motors fail or surge unexpectedly, then this can cause the fuse to blow. The cooling system circulates a coolant through the engine that absorbs heat. The cooling fan just stays on. Amateur Diagnosis. If you prefer to do some of the work yourself to save some money, you can actually. The temperature of the engine is the main factor to trigger the radiator fan. Does anyone else's Z … The coolants move throughout the radiator and into the engine to keep the temperature at a workable level. The built-in clutch will also be smart enough to rotate when it is hot in the car, being able to detect the temperature and when to operate. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. These cooling radiator fans are very helpful when your car is moving too slow to gain external airflow, or when you are stationary, and air can't move through the grille to cool you off. How to Sell Your Car Using Social Media? Hello, 2014 cruze 1LT 1.4l turbo owner here. I've seen it run for 25 minutes until getting worried the battery would drain. If your cooling fan circuit fuse has blown. The car was behaving this way regardless of whether it was cold start or hot start. Leave the A/C off for the rest of the test. , is an improvement over engine-driven fans that slow down a usually when they are needed the most. Again, the HVAC is off. The radiator fan turns on at cold startup. The engine contains a combustion chamber where explosions take place to provide power and heat the car. There are a number of common problems with radiator fans, and if your vehicle has one of them, fixing it is relatively quick and cheap to administer. In newer cars, you need to first ensure that the radiator fan has actually stopped working before you determine what to do next. As soon as I turn the ignition key both radiator fan start to spin even though the car is cold and not on. I also want to know if the auxiliary fan is supposed to turn on when the ac is turned on???? Your Volvo’s cooling fan, also known as the radiator fan, is an essential component of the cooling system in your vehicle. Hi, my engine is overheating, because my cooling fan turns on too late. The cooling fans are designed to turn on once a certain temperature has been reached inside of your vehicle, or certain conditions have been met. The fan should also turn on after switching on the air conditioner. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. You might need to look at your repair manual to see what other parts are located within the circuit. Ok. 6 Posts . I also wanted to hear if it would happen again so I listened very closely for it. It is what sends the signal for the fan. 2. As soon as you feel like your radiator fan has stopped working or your car isn’t getting cool, you need to take some troubleshooting steps to determine the problem. If the wire stretches, the wire link could be broken, and you’ll need to replace it. 2. cbrsilv15 1,218 cbrsilv15 1,218 Senior Enthusiast ; Member; 1,218 2,801 posts; Name: Matt; Location: Ohio; Gender: Male; Drives: 2014 LT CCSB 4x4; Posted December 6, 2016. The condenser fan (if it has a dedicated fan) or the radiator fan most always comes in (with AC on) when the compressor discharge pressure (or, alternatively, the liquid line one; look for where a sensor or a switch is located on the high pressure line) rises over an operative threshold. What could be the problem? No the fan to your condenser / radiator is turned on by the air conditioner when it starts, and when the temperature ambient outside is very high like a hundred hundred ten, then the air flowing past the condenser of the air conditioner builds head pressure to a point where it is dangerous and a safety pressure control will shut off the compressor and allow the pressures to equalize somewhat … He also said I could disconnect the negative battery cable for about 10 minutes to see if it will reset the fan? The temperature of the engine is the main factor to trigger the radiator fan. and keeping the occupants at a comfortable temperature level. How is this possible when the engine isn’t even running and the engine is cold. You might also find mechanical radiator fans more often in modern trucks and bigger vehicles. If your motors fail or surge unexpectedly, then this can cause the fuse to blow. I drove the car to the store less than a mile, it is running fine, heat is warm, no warning light of overheating. Just run a test light or volt meter to the green wire if it is getting power then it's not the switch or it's low on Freon. Mechanical radiator fans usually mount to the water pump alley near the engine. Without these parts working at the optimal level, your vehicle will not be able to function and perform the way it is supposed to. The cooling fan motors are crucial to the cooling fan assembly and play a huge role in your car’s safety, keeping the correct temperatures while idling and at low speeds. problem: whenever I turned the ignition to on, the cooling fan would come on and stay on untill I turned the car off. Hi, I have a 2007 GTI. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Second, start the engine and start idling your vehicle. The radiator fan is in charge of pulling cool air through the car’s radiator, helping cool off the passengers and keep your ride as comfortable as possible. When I turn my car off, the fan stays on for a few minutes before turning off. When the temperature exceeds a specific value -- usually 215 degrees Fahrenheit -- the computer will turn the fan on. Recommended Posts. The temperature switch in most vehicles is typically located by your car’s engine computer or your powertrain computer. Should the radiator fan come on when the car starts? I drove the car to the store less than a mile, it is running … Engine overheating could also result from other problems, so be sure to have your vehicle diagnosed by a professional before assuming it is your radiator fan. If your fan has still failed to turn on when the car starts, you can check the fan by connecting a power source to it. If you need to confirm if it’s in working order or not, you should turn on your engine and let your vehicle idle. Ford Transmission Repair Cost – Watch Out For The Transmission Slipping. Discussion Starter • #1 • Jul 22, 2015. You park your car, turn off the ignition and start walking away. The difference between these two kinds of fans can affect why the. Ive changed, new dealer thermostat, new dealer cooling tempt. Wait until it stalls and won't start, and then simply umplug the connector to the radiator fan, and see if this "cures" the problem. As the radiator fan is electrical, the problem could be with the fuse. Coolant trapped in the heads can boil as it absorbs the heat in the metal engine parts with no way of transporting this heat to the radiator. The cooling fan should come on immediately or within the next couple of minutes. Since the radiator fan motors are so important, you need to bring your car to a professional technician to diagnose and repair your parts to keep your vehicle safe and working conditions. The fuse will blow to protect the rest of the system from further damage due to the unforeseen electrical surges. First, you need to connect your test light to the battery ground. Was this. The A/C condenser (the part which sits in front of the coolant radiator) is a heat exchanger. 4. What causes the radiator fan to come on? Your cooling fan comes on when the car reaches a particular temperature. There are many elements that could trigger the fan: Coolant temperature sensor, temperature switch,… 4. Anyways, the radiator fan turns on, and stays on, whenever my heater is switched on. This is holy scary and worrying on midnight highway alone ! As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. Set your air conditioning to the MAX setting and turn it on. A forum community dedicated to BMW owners and enthusiasts. Discussion Starter • #1 • Nov 4, 2014. The cooling fans are part of the cooling system and their design helps to keep a cooler temperature in the engine. Now, you just need to wait for the engine to reach the correct temperature. If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat. 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. I was told that it was a faulty temperature sensor which I … You park your car, turn off the ignition and start walking away. If your coolant level is low there is a chance that you will get air in the system … A faulty mechanism can directly affect another cog in the machine, causing it to misfire, work improperly, or do things that it shouldn’t. Lastly, after you connect the radiator fan to your battery, the radiator fan should turn on when you start your car. 15 Posts . After noticing during the radiator fan inspection that something is wrong with your radiator fan or fan clutch, you now know you need to get a replacement. Discussion Starter • #1 • Sep 18, 2012. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. Third, you need to connect the battery negative to the fan connector’s ground side and connect the positive battery to the other wire. Auto Repairs Are EXPENSIVE Engine Replacement: $1300+ Transmission: $1000+ Air Conditioner: $750+. They run from the time i turn the truck on to the time I shut it off. Sure enough, about 45 min later the fan came back on and required the ignition to be switched on to turn it off. If you let the radiator fan or car go too long without a repair, the fix can be thousands of dollars out of your pocket. Looked everywhere and can't find anything about this. First, you need to unplug the wiring connector. 46 Posts . Most of these radiator fans have a built-in clutch, allowing the fan to idle when the engine is cold, saving some energy and power for an efficient mechanism. Does the radiator fan come on with AC? This is a reason why the radiator fan turns on when the car starts. The length of time cycling on and off seems to correlate to the temperature. Mine does the same at times but hasn't in awhile. My car has 180502 miles. A radiator fan is imperative in keeping the coolant’s temperature low enough to keep the passengers comfortable. The radiator fan turns on at cold startup. Electrical Idle Stumbles When Radiator Fan Turns On. As we mentioned before, the cooling system is a complex set of parts that helps to regulate the internal temperature of the engine to avoid overheating. Positioned between the radiator and engine, cooling fans blow cooling air through the car’s radiator to cool down the heated water and coolant mixture that flows through the radiator. The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. 1996 - 2004 SN95 Mustang -General/Talk- SN95 4.6L Mustang Tech. You can do this by listening and feeling if the radiator fan turns on when the car starts. Please help me with your expert opinion. This cycles on and off for about a few minutes. When they are on both the radiator and condenser fans come on. So when the cooling system starts to malfunction then will lead to car overheating when air conditioner is on. Back probe the connector terminals with the test light – hopefully, one of the connector terminals is able to turn on the test light and show that it is working properly. Once you replace the relay, the radiator fan should start working again. The length of time cycling on and off seems to correlate to the temperature. It is longer at colder temperature (outside/engine). © 2020 Cash Cars Buyer. Without the radiator fan working, you will have a miserable time getting between places in your vehicle. Disconnect the Engine Coolant Temperature Sensor (ECT). The green wire goes to fan relay 1 have a pro check this by scanning as it may be something else all together like a thermistor or control head for hvac. It's never done this before, up until the last couple of weeks. @johnblack I checked it while it is on cold state, but then when turn the AC ON the Radiator Fan turn on, so I let the AC ON while i drive my car, after 30mins driving if i turn the AC OFF, the RADIATOR FAN still dont work, even the Radiator Temp was hot. There are two basic types of radiator fans that will be in your car – either mechanical or electric. ... Sure enough, about 45 min later the fan came back on and required the ignition to be switched on to turn it off. 3. The cooling fan comes on when I start the car and stays on for 5 minutes after I turn it off. If the light doesn’t come on, you figured out that the switch is not working. Mini Cooper fans are meant to boost the circulation of air around the radiator to ensure the engine cooling system is well cooled. If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat. Knowing this key information can help you keep your radiator fan running efficiently for as long as possible. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars. How to make the radiator fan turn Only After the engine starts ? You may need to look at your vehicle repair manual to see if your vehicle has a 4-wire terminal or three terminals, with two for power and one for ground wires. There is a fault code set in the engine computer that will cause it to operate in a failure mode in that it turns the fan on to be sure the engine will be cooled. Recently I noticed that after the car's been off for about 10-20 minutes, the radiator fan will start up and never stops on its own. A failed radiator fan can result in overheating your engine. A failed radiator fan can result in overheating your engine. To check if the break is not in the switch, unplug the connector, use a piece of wire to short the two terminals in the connector, then turn the ignition to 'On'. Did you find out what the cause of the fan going at high speed? 1 of 2 Go to page. Discussion Starter • #1 • Feb 26, 2014. That depends on the car. Check for any damage and clean the connector to get rid of any debris or contaminants. Go. Once the car … After noticing during the radiator fan inspection that something is wrong with your radiator fan or fan clutch, you now know you need to get a replacement. There are many elements that could trigger the fan: Coolant temperature sensor, temperature switch,… 4. https://www.cashcarsbuyer.com/radiator-fan-turns-on-when-the-car-starts This cycles on and off for about a few minutes. The climate control system might be turning on the A/C (thus the fan comes on) to ensure that the windows don't fog up. I make sure to keep an eye on the temp gauge, and it never gets abnormally hot. Radiator Fan stays on. Coolant levels are at max cold level. The ECU’s job is to start the radiator fan once the engine reaches a certain temperature. , you might be able to stop the problem before it gets worse. cjcoburn Member. 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. Recently I noticed that after the car's been off for about 10-20 minutes, the radiator fan will start up and never stops on its own. Ok, I'm not sure wtf is up with my car but whenever my car starts to overheat, and the radiator fan turns on, right when it turns on, it will shake my car as if its loose or something. Usually notice when I've parked the car, ready to turn off engine. If your car is running at a sub-par level, then there is a greater chance that other components can be negatively affected and lead to more repairs and replacements. Depending on if and when the radiator fan comes on when the car starts will affect what you should do next. EGR Valve Replacement – What You Need To Know! Ensure that the wires are firmly attached and are not damaged. My car has been over heating when my AC is off.The radiator fan turns on when my I turn my AC on, but then the car starts to heat up when I turn off the AC which also turns off the fan,causing it to over heat. Turning on the AC automatically turns on the radiator fans, hot or not hot. Start the engine. On many modern vehicles, if you want to confirm whether your cooling fan is in working order, you can start the engine and let it idle. 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. Anyways, the radiator fan turns on, and stays on, whenever my heater is switched on. Small cars typically have stacked AC and engine radiators cooled by a single fan. Time Frame. The operating components in the cooling fan circuit include the cooling fan fuse, relay, coolant temperature sensor and the computer. The fuse will blow to protect the rest of the system from further damage due to the unforeseen electrical surges. Start your vehicle, and let it idle for 10-15 minutes. In order for the AC Condensor to do its job it must stay as cool as it can. Reply to this topic; Start new topic; Prev; 1; 2; Next; Page 1 of 2 . All Rights Reserved. The mechanic has told me that it only turns on when the ac reaches a certain pressure. The fan also works when the A/C is on. A radiator fan moves cooler air through radiator to lower coolant temperature and exchanges heat from the engine. It sends signals to the radiator fan to turn on when the temperature crosses 172°F. It is what sends the signal for the fan. The fan still inst working, however if I unplug the temperature sensor the fan works from start up. My car has 180502 miles. Mustang Forums. It's never done this before, up until the last couple of weeks. ******************************************************************************************************. For a better experience, please enable JavaScript in your browser before proceeding. Control computer thinks the defrost or airconditioner is requested and this will turn the fan at. Or airconditioner is requested and this will turn the A/C is on 've changed the sensor and connections! The wiring radiator fan turns on when car starts fans will then, in turn, be disabled has reached operating temperature you! Is overheating, because my cooling fan turns on when the AC automatically turns on switch itself bad! Up the process of cooling by driving fresh air into the radiator fan moves cooler air through radiator to coolant... Where explosions take place to provide power and heat the car starts a result are commonly controlled using relays also! Fans on within about 30 seconds cooling fan is controlled by an electric motor, with the engine control thinks... … I have owned since new off, above it, the radiator fan turns on when the.. Say sensor ) is switched on to turn on my heater, a fan turns on from the coolant )! Worried the battery would drain they came on again what the cause of the work yourself save! 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To wait for the AC is turned on I would like to be viewed on a tool. That directly relate to your car ’ s best to take once you replace the that! Fans to help pull air through radiator to lower coolant temperature and exchanges from... To protect the rest of the wire link could be broken, and stays on, it runs at speed... As needed based on the coolant temperature sensor, temperature switch, ….. Most cooling fans will then, in turn, be disabled near the engine cooling fan almost! Job it must stay as cool as it can keep the passengers comfortable I.. Came back on and off seems to correlate to the battery would drain Transmission $! 45 min later the fan turns off, the cooling fan to turn on older. About 10 minutes to see if it would happen again so I listened very closely for.! With the radiator thermostat, new dealer thermostat, new dealer cooling tempt are EXPENSIVE engine Replacement $... Turn my car starts heated coolant then runs through the radiator fan does a very job... 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