By cbrsilv15, December 6, 2016 in 2014-2018 Silverado & Sierra Troubleshooting. Temperature will often determine the time that a radiator fan starts up. Insufficient Coolant. Below 200 degrees, the fan turns off, above it, the fan turns on. The difference between these two kinds of fans can affect why the. 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. sensor, and radiator cup. Knowing this key information can help you keep your radiator fan running efficiently for as long as possible. Discussion Starter • #1 • Jul 22, 2015. Anyways, the radiator fan turns on, and stays on, whenever my heater is switched on. 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. Normally AC usually will heat up after you turn it on, and the air conditioning cooling system was set the reduce the heat. It … Hello, 2014 cruze 1LT 1.4l turbo owner here. Also, the fan will do this even after short 5-10 minute trips. The engine control computer thinks the defrost or airconditioner is requested and this will turn the fan on. 2. What causes the radiator fan to come on? The length of time cycling on and off seems to correlate to the temperature. Should the radiator fan come on when the car starts? You can call us out if your car won’t start or you think the engine's overheating. The mechanic has told me that it only turns on when the ac reaches a certain pressure. The radiator fan turns on at cold startup. Also, the fan will do this even after short 5-10 minute trips. The trigger is the thermostat in the radiator of your vehicle. It is what sends the signal for the fan. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. Thread starter cjcoburn; Start date Jul 4, 2017; Forums. 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. 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. These explosions cause the engine to heat up extremely quickly and can sometimes lead to overheating. Buy breakdown cover. Reply to this topic; Start new topic; Prev; 1; 2; Next; Page 1 of 2 . 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. 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. The ECU’s job is to start the radiator fan once the engine reaches a certain temperature. 3. 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. Why does your Mini Cooper Fan stay on when I turn off the engine? Just an idea, but could this be normal? As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. turns on and off as needed based on the internal vehicle temperature. 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. Car has about 75k-80k miles, and recently the fan started staying on after I turn the car off ( no matter how long the trip or the temp outside). The cooling fan comes on when I start the car and stays on for 5 minutes after I turn it off. As soon as I turn off my heater, the fan turns off. 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. As soon as I turn off my heater, the fan turns off. I have read that is should turn on when the ac is turned on I would like to be reassured of this. Even in melbourne's current weather, sub 20degC, short (5km) easy driving to the shopping centre the radiator fan turns on. If that does not occur, replace the PCM. 3. 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. This small structure can wear out after prolonged use. , is an improvement over engine-driven fans that slow down a usually when they are needed the most. This cycles on and off for about a few minutes. In newer cars, you need to first ensure that the radiator fan has actually stopped working before you determine what to do next. Without these parts working at the optimal level, your vehicle will not be able to function and perform the way it is supposed to. I also want to know if the auxiliary fan is supposed to turn on when the ac is turned on???? Ive changed, new dealer thermostat, new dealer cooling tempt. The. Depending on if and when the radiator fan comes on when the car starts will affect what you should do next. I also wanted to hear if it would happen again so I listened very closely for it. Third, you need to connect the battery negative to the fan connector’s ground side and connect the positive battery to the other wire. 2. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! JavaScript is disabled. ******************************************************************************************************. This type of radiator fan is almost always found in modern vehicles and sedans. I'll check and clean connections. 3. 4. I believe it would be the radiator fan, since I usually hear the same fan noise when my car starts to overheat. Cadillac Transmission Repair Cost – Avoid The 2016 Cadillac ATS! If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat. Start the engine. If your vehicle is not operating the way it is meant to, then the radiator fan will not turn on when the car starts. 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. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. https://www.cashcarsbuyer.com/radiator-fan-turns-on-when-the-car-starts Hi, my engine is overheating, because my cooling fan turns on too late. 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. It sends signals to the radiator fan to turn on when the temperature crosses 172°F. 6 Posts . So, everytime I turn on my heater, a fan turns on from the engine bay. 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. If the clutch assembly isn’t working properly , or begins to fail itself, it can cause the fan to stop working. 10 Smart Tips! Again, the HVAC is off. If your cooling fan circuit fuse has blown. For a better experience, please enable JavaScript in your browser before proceeding. If the fan stays off, then the switch is bad. The cooling fan comes on when I start the car and stays on for 5 minutes after I turn it off. Depending on if and when the radiator fan comes on when the car starts will affect what you should 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. If the wire stretches, the wire link could be broken, and you’ll need to replace it. A temperature-sensitive switch functions to turn the fan on and off periodically. This cycles on and off for about a few minutes. Go. Then you notice the engine cooling fan is still running even though the car is turned off. Mine does the same at times but hasn't in awhile. Small cars typically have stacked AC and engine radiators cooled by a single fan. 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. After the engine has reached operating temperature, you have to probe the other wire at the connector. When they are on both the radiator and condenser fans come on. I checked all the relays and fuses. 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. Ok. Radiator Fan stays on. Otherwise it will remain a raise hood throw on some parts repair attempt. So far I've changed the sensor and cleaned connections without resolution. There are many elements that could trigger the fan: Coolant temperature sensor, temperature switch,… 4. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. I believe it would be the radiator fan, since I usually hear the same fan noise when my car starts to overheat. That depends on the car. Your Volvo’s cooling fan, also known as the radiator fan, is an essential component of the cooling system in your vehicle. Every time I go to start the car after it has been sitting for an entire day and the engine is cold, when I turn the key to the “On” position, before the engine is even started, the cooling fan comes on. problem: whenever I turned the ignition to on, the cooling fan would come on and stay on untill I turned the car off. Recommended Posts. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. The answer is simple; there is something wrong with the fan or the cooling system. This issue doesn't happen if engine is warm. My radiator fans are all out off whack (simply put). I am clueless where to go next. A radiator fan moves cooler air through radiator to lower coolant temperature and exchanges heat from the engine. The second symptom of a damaged radiator fan motor is that your car is currently overheating. If your motors fail or surge unexpectedly, then this can cause the fuse to blow. This is a reason why the radiator fan turns on when the car starts. My car has 180502 miles. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. 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. The coolant fan will continue to run until the … Checked the voltage on the coolant sensor harness with ignition switch on, there is no 5v or the green pin is not grounded. is that your car is currently overheating. Below 200 degrees, the fan turns off, above it, the fan turns on. 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. All Rights Reserved. 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. A sign of the wire link needing replacing is if your radiator fan fails to turn on when the car starts. cjcoburn Member. Does the radiator fan come on with AC? Ford Transmission Repair Cost – Watch Out For The Transmission Slipping. Check for any damage and clean the connector to get rid of any debris or contaminants. Discussion Starter • #1 • Nov 4, 2014. 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. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. Yes, the fan will come on when you turn the A/C on, so that proves the fan works. 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. Auto Repairs Are EXPENSIVE Engine Replacement: $1300+ Transmission: $1000+ Air Conditioner: $750+. The cooling fans are part of the cooling system and their design helps to keep a cooler temperature in the engine. The cooling fan should come on immediately or within the next couple of minutes. Should the radiator fan come on when the car starts? This is not after a … Mine occasionally does the same thing. How is this possible when the engine isn’t even running and the engine is cold. When I turn my car off, the fan stays on for a few minutes before turning off. Cooling fans always running? Electric cooling fans to turn on when the radiator fan are located within the circuit why... Owned since new consider running an experiment where you cold start or you think the engine and.! Should radiator fan turns on when car starts radiator fan light doesn ’ t come on the water pump alley near the engine is thermostat! Then off fan will do this even after short 5-10 minute trips working. 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