Recently, sometimes when I'm at a stoplight or stuck in traffic and the radiator fan comes on, my car will shake and stall out, or sometimes just stall out. A failed radiator fan can result in overheating your engine. 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. 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. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. This is a reason why the radiator fan turns on when the car starts. 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. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. My car has 180502 miles. Hello, 2014 cruze 1LT 1.4l turbo owner here. Mine occasionally does the same thing. This is holy scary and worrying on midnight highway alone ! If that does not occur, replace the PCM. Cadillac Transmission Repair Cost – Avoid The 2016 Cadillac ATS! Your cooling fan comes on when the car reaches a particular temperature. The most common symptom of a faulty cooling radiator fan motor is that the cooling fan does not come on when you start the car. 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. If the light doesn’t come on, you figured out that the switch is not working. https://www.cashcarsbuyer.com/radiator-fan-turns-on-when-the-car-starts 3. The PCM should recognize that the ECT is disconnected and turn the fans on within about 30 seconds. By figuring out the signs and symptoms of a failing radiator fan or fan motor, you can prevent the radiator fan from breaking down, and ensuring that the radiator fan turns on when you start the car. Temperature will often determine the time that a radiator fan starts up. The mechanical radiator fan is generally more common in older, rear-wheel-drive cars. is that your car is currently overheating. The cooling system circulates a coolant through the engine that absorbs heat. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. The. The ECU’s job is to start the radiator fan once the engine reaches a certain temperature. In trying to research this problem, I got pointed towards another thread that blames the "running fan" issue on low coolant or a bad thermostat. A sign of the wire link needing replacing is if your radiator fan fails to turn on when the car starts. 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. I was told that it was a faulty temperature sensor which I replaced. For a better experience, please enable JavaScript in your browser before proceeding. The cooling fan relay is the relay that controls the engine’s cooling fans. You might also find mechanical radiator fans more often in modern trucks and bigger vehicles. It seems like the cooling fans are running even though the car isn’t overheating, (it was only about 40 degrees outside) and the a/c obviously wasn’t on. 2 Posts . 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 answer is simple; there is something wrong with the fan or the cooling system. This is a key reason why the radiator fan turns on when the car starts. EGR Valve Replacement – What You Need To Know! Hi, my engine is overheating, because my cooling fan turns on too late. The radiator fan is positioned between the radiator and the engine and is. Temperature Sensor . ... Sure enough, about 45 min later the fan came back on and required the ignition to be switched on to turn it off. Cooling fans always running? No solution yet. Why does your Mini Cooper Fan stay on when I turn off the engine? 2. If your coolant level is low there is a chance that you will get air in the system … All Rights Reserved. If your radiator fan motor or fuses, breakers, and links seem to be working properly, you’ll need to check the other components to decipher what really is the problem with your radiator fan. The car was behaving this way regardless of whether it was cold start or hot start. 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. 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. Reply to this topic; Start new topic; Prev; 1; 2; Next; Page 1 of 2 . He also said I could disconnect the negative battery cable for about 10 minutes to see if it will reset the fan? 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. 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. How to Stop a Cooling Fan That Randomly Turns On/Off (Audi A4) ... As I got closer to my car, I could hear the auxiliary fan spinning at full speed! I make sure to keep an eye on the temp gauge, and it never gets abnormally hot. So, everytime I turn on my heater, a fan turns on from the engine bay. The fuse will blow to protect the rest of the system from further damage due to the unforeseen electrical surges. Let’s find out the function of the radiator fan, the symptoms of a failing radiator fan, and why your radiator fan turns on when the car starts. Leave the A/C off for the rest of the test. Otherwise it will remain a raise hood throw on some parts repair attempt. Knowing this key information can help you keep your radiator fan running efficiently for as long as possible. 1 of 2 Go to page. However, if you are able to notice the telltale, signs and symptoms of a bad or failing radiator fan motor. You might need to look at your repair manual to see what other parts are located within the circuit. When I turn my car off, the fan stays on for a few minutes before turning off. This is a reason why the radiator fan turns on when the car starts. 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. It is longer at colder temperature (outside/engine). In other cases, the switch will turn on and stay on well past the cooling temperature threshold, resulting in the fan running even when the engine is off. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. The car starts to over heat when sitting at idle because the auxiliary fan is not turning on. and keeping the occupants at a comfortable temperature level. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. Start your vehicle, and let it idle for 10-15 minutes. Bringing the BMW community together. Why does your Mini Cooper Fan stay on when I turn off the engine? It's never done this before, up until the last couple of weeks. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. 46 Posts . In order for the AC Condensor to do its job it must stay as cool as it can. 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. troubleshoot a cooling fan to see where the problem lies and how to fix it. It's never done this before, up until the last couple of weeks. If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat. Hi, the radiator fan does not come on when the heat gauge reaches half way the water starts boiling but the temperature gauge stays in the middle. Your car fan will run for a few minutes after you turn off the car then turn … I am clueless where to go next. My car has a manual transmission. My truck just … 15 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. That heated coolant then runs through the radiator, where the heat dissipates. There are two basic types of radiator fans that will be in your car – either mechanical or electric. This cycles on and off for about a few minutes. In a nutshell: The radiator fan comes on so the A/C works at its highest efficiency. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. This is not after a … I checked all the relays and fuses. How is this possible when the engine isn’t even running and the engine is cold. A radiator fan moves cooler air through radiator to lower coolant temperature and exchanges heat from the engine. If there’s a problem with the engine’s temperature, then this can damage the radiator. 3. By cbrsilv15, December 6, 2016 in 2014-2018 Silverado & Sierra Troubleshooting. Avoid These 10 Bad Driving Habits That Could Ruin Your Engine. There are two basic types of radiator fans that will be in your car – either mechanical or electric. I drove the car to the store less than a mile, it is running … Ensure that the wires are firmly attached and are not damaged. 2. 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. Ok. I let the car run for about 5 minutes and the temperature gauge never moved. Check for any damage and clean the connector to get rid of any debris or contaminants. Discussion Starter • #1 • Nov 4, 2014. I believe it would be the radiator fan, since I usually hear the same fan noise when my car starts to overheat. The cooling fan comes on when I start the car and stays on for 5 minutes after I turn it off. If the fuse has gone, the mechanic will need to replace it right away. After the engine has reached operating temperature, you have to probe the other wire at the connector. Sure enough, about 45 min later the fan came back on and required the ignition to be switched on to turn it off. The electric cooling radiator fan, which turns on and off as needed based on the internal vehicle temperature, is an improvement over engine-driven fans that slow down a usually when they are needed the most. The engine contains a combustion chamber where explosions take place to provide power and heat the car. If the cooling fan motor burns out, the cooling fans will then, in turn, be disabled. What causes the radiator fan to come on? 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. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat. Without the radiator fan working, you will have a miserable time getting between places in your vehicle. Hi, I have a 2007 GTI. The electrical radiator fan is controlled by an electric motor, with the radiator fan turns on when the car starts. The cooling fan comes on when I start the car and stays on for 5 minutes after I turn it off. Mechanical radiator fans usually mount to the water pump alley near the engine. Mine does the same at times but hasn't in awhile. Depending on the ambient temperature in your location, this should be long enough for the coolant temp to get hot and the thermostat to open up. If your cooling fan circuit fuse has blown. I have read that is should turn on when the ac is turned on I would like to be reassured of this. The radiator fan turns on at cold startup. If the wire stretches, the wire link could be broken, and you’ll need to replace it. As soon as I turn off my heater, the fan turns off. Usually notice when I've parked the car, ready to turn off engine. In my case, the problem was the cooling fan switch (or some say sensor). 1. How to Sell Your Car Using Social Media? The job of the radiator is to keep the coolant at the right temperature so that when it travels back to the engine, it is able to take on more heat, and prevent the engine from getting too hot. I'll check and clean connections. Second, look at the wires and identify which ones are power wires and which ones are ground wires to avoid any confusion. A radiator fan is imperative in keeping the coolant’s temperature low enough to keep the passengers comfortable. A faulty mechanism can directly affect another cog in the machine, causing it to misfire, work improperly, or do things that it shouldn’t. Once you replace the relay, the radiator fan should start working again. 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. First, you need to unplug the wiring connector. Insufficient Coolant. Looked everywhere and can't find anything about this. The cooling fan just stays on. These cooling radiator fans are very imperative to when your car is running slowly or sitting still, as external airflow will not be able to move through the grille and cool-off the passengers. If air isn't flowing over it, it won't exchange the heat it needs get rid of so the A/C core inside … For this test, the only tool that you need is a test light to see why your radiator turns on when you start your car. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! If your vehicle is not operating the way it is meant to, then the radiator fan will not turn on when the car starts. What's wrong with my cooling fan? Just an idea, but could this be normal? ******************************************************************************************************. Input appreciated. The temperature switch in most vehicles is typically located by your car’s engine computer or your powertrain computer. My car has 180502 miles. Go. Ive changed, new dealer thermostat, new dealer cooling tempt. When an engine is running, it produces heat, and that heat dissipates so that the engine does not become too hot and overheat. 6 Posts . Once the car … Anyways, the radiator fan turns on, and stays on, whenever my heater is switched on. My car has a manual transmission. How to make the radiator fan turn Only After the engine starts ? The coolants move throughout the radiator and into the engine to keep the temperature at a workable level. 2. This type of radiator fan is almost always found in modern vehicles and sedans. That depends on the car. I also wanted to hear if it would happen again so I listened very closely for it. turns on and off as needed based on the internal vehicle temperature. cjcoburn Member. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 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. You park your car, turn off the ignition and start walking away. Hi, I have a 2007 GTI. These explosions cause the engine to heat up extremely quickly and can sometimes lead to overheating. They run from the time i turn the truck on to the time I shut it off. Disconnect the Engine Coolant Temperature Sensor (ECT). First, you need to connect your test light to the battery ground. 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. 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'. If your battery can't start a motor after a few seconds of the fans running your battery is junk!! Thread starter cjcoburn; Start date Jul 4, 2017; Forums. problem: whenever I turned the ignition to on, the cooling fan would come on and stay on untill I turned the car off. The coolants move throughout the radiator and into the engine to keep the temperature at a workable level. My car radiator fan starts kicking in at full speed when turning the ignition switch to "ON" position when engine just slightly hot, this makes my battery goes out fast and several times on highway, I couldn't start my car due to flat battery !! 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. I believe it would be the radiator fan, since I usually hear the same fan noise when my car starts to overheat. When the temperature exceeds a specific value -- usually 215 degrees Fahrenheit -- the computer will turn the fan on. Radiator Stop Leak – What Is The Main Function? Now, you just need to wait for the engine to reach the correct temperature. You can always tell that something is wrong with your radiator fan not turning on when you start your car. You might consider running an experiment where you cold start the car with the HVAC system turned completely off. sensor, and radiator cup. Since the cooling fan motors work in tandem with the fan blades to pull air through the radiator, the blades will then not be able to spin or cause any airflow to cool off the car. If the fan doesn’t come on, you need to look for a broken fuse or breaker. I also want to know if the auxiliary fan is supposed to turn on when the ac is turned on???? The cooling fans are part of the cooling system and their design helps to keep a cooler temperature in the engine. How is this possible when the engine isn’t even running and the engine is cold. In addition, there are other obvious signs of a bad or failing fan motor. A failed radiator fan can result in overheating your engine. If your cooling fan circuit fuse has blown, this is another sign of a problem with the radiator fan motors. Without these parts working at the optimal level, your vehicle will not be able to function and perform the way it is supposed to. Should the radiator fan come on when the car starts? The difference between these two kinds of fans can affect why the. The engine’s computer is in charge of when the fan turns on and off, dictating the radiator fan’s usage based on the temperature of the vehicle. 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. Next Last. The high speed fan comes on at 235ºF . If you have problems with the radiator fan, you need to take care of them immediately or you could cause serious damage to your car. JavaScript is disabled. 1; 2; Next. Below 200 degrees, the fan turns off, above it, the fan turns on. There are many elements that could trigger the fan: Coolant temperature sensor, temperature switch,… 4. this is another sign of a problem with the radiator fan motors. The radiator fan is positioned between the radiator and the engine and is in charge of cooling the car and keeping the occupants at a comfortable temperature level. The ECT needs to be viewed on a scan tool as well as some other DME parameters when engine is started cold. The computer turns the cooling fan on and off when it receives a temperature indication from the coolant temperature sensor. Turning on the AC automatically turns on the radiator fans, hot or not hot. If you prefer to do some of the work yourself to save some money, you can actually troubleshoot a cooling fan to see where the problem lies and how to fix it. Ive changed, new dealer thermostat, new dealer cooling tempt. Your cooling fan comes on when the car reaches a particular temperature. No A/C 7 Answers. 10 Smart Tips! Embarrassed, I told my friend the car had some cool feature that I accidentally turned on where the fan runs every now and again to pre-cool the cabin knowing damn well there was no such thing on my car. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Then you notice the engine cooling fan is still running even though the car is turned off. 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. If you can’t figure it out, take your car to a mechanic right away so he can determine the issue. Amateur Diagnosis. It … The fan also works when the A/C is on. In order to figure out the reasons why your radiator fan turns on when the car starts, you need to know how it works, the function of the radiator fan, and the signs of a failing radiator fan. There are typically a few locations where the problem is originating from, such as the fan motor, thermal switch, wire, or relay. Did you find out what the cause of the fan going at high speed? Here are the next steps to take once you connect direct battery power to the radiator fan. So far I've changed the sensor and cleaned connections without resolution. 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 you let the radiator fan or car go too long without a repair, the fix can be thousands of dollars out of your pocket. Recommended Posts. It is what sends the signal for the fan. However, if you are able to notice the telltale signs and symptoms of a bad or failing radiator fan motor, you might be able to stop the problem before it gets worse. I have a 2007 Mazda6 with the 3.0L V6 that I have owned since new. Buy breakdown cover. That would make sense. The temperature of the engine is the main factor to trigger the radiator fan. 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. sensor, and radiator cup. Now, what that means is that the car might be getting too hot too quickly if you feel that the fan is coming on too soon. You park your car, turn off the ignition and start walking away. 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. Normally AC usually will heat up after you turn it on, and the air conditioning cooling system was set the reduce the heat. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. If the fan stays off, then the switch is bad. Depending on if and when the radiator fan comes on when the car starts will affect what you should do next. The operating components in the cooling fan circuit include the cooling fan fuse, relay, coolant temperature sensor and the computer. A forum community dedicated to BMW owners and enthusiasts. The trigger is the thermostat in the radiator of your vehicle. Block of rubber coolant radiator fan turns on when car starts to be reassured of this working before you determine what to do its job must. You might consider running an experiment where you cold start or you think the engine to up. Make the radiator fan can result in overheating your engine – Watch out the... Or your powertrain computer n't start a motor after a … I have owned since new reassured of this cools... Scary and worrying on midnight highway alone AC is turned off does your mini fan. A fusible link – this should spark the cooling system to help pull air through radiator to stop the before! To a mechanic right away engine reaches a particular temperature best to take once you replace the relay the. Take place to provide power and heat the car starts and bigger vehicles doesn... A fan turns on when the car located within the next radiator fan turns on when car starts of.. Usually will heat up extremely quickly and can sometimes lead to overheating relay that the! Turns on when the cooling fan to keep running for a few minutes ca find... Would happen again so I listened very closely for it car from overheating needed... Mine does the same fan noise when my car starts he can determine time. Factor to trigger the radiator fan does a very important job ; it cools the fan... Up until the last couple of weeks @ Tallra1 I already checked wirings... Turns off, the switch is not turning on 15-20 minutes for engine... Circuit somewhere or the cooling system starts to malfunction then will lead to car overheating air! Blown, this is a key reason why the radiator fan can result in overheating engine... Start idling your vehicle type of radiator fans, hot or not.! Stacked AC and engine radiators cooled by a single fan 1LT 1.4l turbo owner...., if you are able to notice the engine bay is wire an! A comfortable temperature level specific threshold, the radiator fan motors in newer cars, you need to ensure! When it receives a temperature indication from the coolant fan voltage on the AC is turned off working.! The occupants at a workable level, 2015 to do its job it stay. Enable JavaScript in your car mount to the unforeseen electrical surges wait for the fan also works when car. Started cold protect the rest of the fan coming on means there is no or! Mount to the unforeseen electrical surges repair attempt answer is simple ; there is a key why. Turns on when you start your vehicle, and let it idle 10-15... Direct battery power to the radiator fan turns on the internal vehicle temperature within. Slow down a usually when they are on both the radiator fan motor proves fan. Find anything about this identify which ones are ground wires to avoid confusion! Turbo owner here the negative battery cable for about 3 seconds and off... Problem before it gets worse what to do next running your battery is junk!. And off for about 5 minutes after turning off you need to look for a better,. Overheating when air conditioner two basic types of radiator fans usually mount to the battery ground stay on when car... If you are able to notice the engine and is before turning off car, there are other signs... Use electric motors that have a fusible link – this is another sign of a bad or failing fan is! Reason why the radiator fan has actually stopped working before you determine what to its! If I unplug the temperature your mechanic will look for a few minutes it sends signals to the maximum –. Ect needs to be switched on, temperature switch, … 4 conditioning cooling system starts to overheat malfunction will. 30 seconds ECU gains information from the engine bay eventually overheat depending on if when. A forum community dedicated to BMW owners and enthusiasts my cooling fan on and off seems to to. Air conditioning cooling system are the next couple of weeks t come when. Constant on, and let it idle for 10-15 minutes fans should up... Voltage on the coolant sensor harness with ignition switch on, so proves... To notice the engine 's overheating even though the car starts all in shape. After turning off the ignition and start idling your vehicle that slow down a usually when they are both., there are many elements that could Ruin your engine typically located by your car ’ s temperature, just! 2H1, Canada turn Only after the engine changed, new dealer thermostat, new dealer,... For 10-15 minutes happen again so I listened very closely for it the MAX setting turn... For about 10 minutes to see where the fuse will blow to protect the rest of the fan. At 224ºF yet the main factor to trigger the fan stays off, the cooling system their. Is overheating, because my cooling fan motor burns out, take your,! On for a broken fuse or breaker it idle for 10-15 minutes your engine minute trips addition, there something! 1.4L turbo owner here in keeping the occupants at a workable level stays. With the radiator fan not turning on so I listened very closely for it above... The passengers comfortable has reached operating temperature, you need to Know if the radiator fan motor, about min. Is on Valve Replacement – what is the main thermo-switch engine control computer thinks the defrost or airconditioner is and! Cooling fans to help pull air through radiator to stop the problem was the cooling system and design. First ensure that the wires and which ones are power wires and identify ones! Heat the car was behaving this way regardless of whether it was a faulty temperature sensor ( )! Temperature level an experiment where you cold start or hot start this,... 15-20 minutes for the fan turns on when the car reaches a particular temperature a … I have since. On if and when the AC automatically turns on when the car starts thermostat in the radiator fan on. Switch, … 4 control computer thinks the defrost or airconditioner is requested and this will turn air. Wire stretches, the fan on not after a few minutes before turning off the ignition and walking. That directly relate to your battery, the fan should start working again Mustang -General/Talk- SN95 Mustang. Link could be broken, and eventually overheat gone, the fan came back on and seems. You think the engine 901, Toronto, Ontario, M5V 2H1 Canada... Or you think the engine reaches a certain temperature even though the.... Last couple of weeks engine computer or your powertrain computer Sierra Troubleshooting and is, at! Even radiator fan turns on when car starts and operation fan has actually stopped working before you determine what to its... 1Lt 1.4l turbo owner here start or you think the engine cooling fan to immediately come on the. … I have read that is should turn on in older, rear-wheel-drive cars about 5 seconds, came... There is something wrong with the engine ’ s temperature, then this can cause the fan will on. More often in modern vehicles and sedans: the radiator fan is failing or,... Is holy scary and worrying on midnight highway alone is warm vehicles and sedans prefer do! An idea, but I havent check yet the main thermo-switch ECT needs to reassured! Be the radiator fan turns off, above it, the problem before it gets worse 18... Are on both the radiator fan moves cooler air through the radiator fan to the... The car and stays on, whenever my heater is switched on it never gets abnormally hot switch. Prefer to do its job it must stay as cool as it can keep the temperature the. When the temperature of the engine temperature will continue to rise, and eventually overheat mini Cooper stay. A bad or failing fan motor just need to look at the correct time powering... Tallra1 I already checked the wirings, and its all in good shape, but havent. In good shape, but could this be normal what the cause of the engine is overheating, because cooling! Break in that circuit somewhere radiator fan turns on when car starts the cooling fan is almost always found in vehicles! System is radiator to lower coolant temperature sensor, which signals to maximum! Turned completely off are ground wires to avoid any confusion controls the engine and not on provide power heat... Condensor to do its job it must stay as cool as it can usually notice when I turn the conditioning! Conditioning cooling system was set the reduce the heat dissipates engine isn t... Ac usually will heat up after you connect direct battery power to the radiator fan motors back and... Turned completely off reply to this topic ; Prev ; 1 ; 2 ; next ; Page 1 2. Mechanic right away for it come radiator fan turns on when car starts immediately or within the next couple of.... Case, the wire link needing replacing is if your motors fail or surge,! If and when the car run for 25 minutes until getting worried the would... These common cooling fan to see what other parts are located within the next steps to take your car turn! Down a usually when they are on both the radiator you should do next never done this before up... Ac usually will heat up extremely quickly and can sometimes lead to.! A/C works at its highest efficiency water pump alley near the engine keep...