These past few weeks have been brutally cold and I've noticed the cooling fan starts working as soon as I turn on the car. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. Not understanding why the fan is coming on time I start it. Usually notice when I've parked the car, ready to turn off engine. Last year I changed the thermostat housing because losing coolant. Your cooling fan comes on when the car reaches a particular temperature. Comments: Hello, I have a 2010 mini cooperS and as soon as I start the car the fan comes on, and take a while to turn off. Ok here is alittle more information for my problem, i have had the car since 08/2006, no problems, i went to my car on saturday morning and it was hard to start but it did eventually turn over, i had a few errands to run so i was in and out of the car, i had no more problems with it starting. Start the engine. How to make the radiator fan turn Only After the engine starts ? 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. Your car fan will run for a few minutes after you turn off the car then turn … Help Plz This sensor switches the cooling fan off and on as needed. 4. No A/C 8 Answers. Mini Cooper fans are meant to boost the circulation of air around the radiator to ensure the engine cooling system is well cooled. The length of time cycling on and off seems to correlate to the temperature. Another way to test the fan is to turn … For this, the radiator was disassembled and then reassembled. 2. A bad starter would cause the car not to start. I replaced water pump and radiator and coolant temp sensor. Operating the fan is a decision with many variables, and in a well-designed system it happens when hot outside and not moving, and perhaps after a delay (the radiator doesn't get hot immediately). 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. Disconnect the Engine Coolant Temperature Sensor (ECT). 3. The first I know about it is the start/stop gets disabled and my fuel economy starts to go down. Below 200 degrees, the fan turns off, above it, the fan turns on. This is the first car I've had with a DPF. In fact I am sure the fan will never work with the thermoswitch disconnected I assume you think the thermoswitch has fused contacts on high speed. Then fan shuts off at 0:29. idle stumble with radiator fan tach You may need to turn-up your volume to hear when the engine bogs down, which happens at 0:05. My radiator fans are all out off whack (simply put). 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. I thought this was odd due to the air temperature. Why does your Mini Cooper Fan stay on when I turn off the engine? Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. When she arrived at her destination she turned the vehicle off. Then you notice the engine cooling fan is still running even though the car is turned off. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. ... they work I hooked the wire to intestinal the battery must fans work and when I unplug the temperature sensor both fans turn on but my car will not start and I just replace the sensor any ideas. It is what sends the signal for the fan. ... preset temperature, the fan will begin cooling the engine. When I turn on the ac the fan works and keeps the car cool. Radiator fan comes on when I start car and does not go off. 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. To test this, find your radiator fan switch and disconnect the wiring harness. Get a jumper wire and insert it into both contacts, your fan should come on. What causes the radiator fan to come on? At stops the engine shut off as expected. I am sure the fan won't come on from the start that way. 1. My engine fan turns on when I turn the ignition on but not the engine. Some cars have an electric fan that forces air thru the radiator. Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. The mini copper fans should speed up the process of cooling by driving fresh air into the radiator. When the temperature dips below that preset temperature, the fan will turn off. Like any Euro, it's got a few quirks but overall it's been an honest, fun to drive sports wagon. When are driving at hi-way speeds, and you pull off the road, the engine temp spikes or rises, as it is trying to cool down, sort of like you after a run or exercise, need to "walk-it-off" or cool down. A failed sensor can cause the fan to run excessively or not run when cooling is needed. Also when putting the air con on, it kicks in the fan and goes off when air con is turn off so that seems to be working fine also. AC and defrost is off. each time to start the car, the climate fan motors make loud noise and stay being noisy. I was told that it … This is holy scary and worrying on midnight highway alone ! If that does not occur, replace the PCM. You park your car, turn off the ignition and start walking away. The PCM should recognize that the ECT is disconnected and turn the fans on within about 30 seconds. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. Other Types of Fans. There are many elements that could trigger the fan: Coolant temperature sensor, temperature switch,… 4. 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. Select AC and the radiator fan speeds up to improve cooling. The low speed fan comes on at 224ºF. I will of course check to see if the radiator fan comes on when i start the car in the morning when cold to rule anything else out ( as i've never know of a radiator cooling fan to come on when engine cold ) The cooling fan relay is the relay that controls the engine’s cooling fans. ... No. Funny that people turn off the AC and turn it back on to try to shut off the fan that is working it's little butt off to speed up the cool down of the car. Cooling fan … It's also rather noisy and a bit embarrassing when you stop the car and turn the engine off and all you can hear is the radiator fan going hell for leather. Cooling fan continued to run. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Now when I switch the car on ignition position, the coolant fan turn on too even if the car's dead cold.... it has never happened before. I've changed the cooling sensor and cooling fan, and im still having this problem. 2. If the a/c is on, then it turns on the radiator fan. Should the radiator fan come on when the car starts? To Test: 1. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. Radiator fan kicks-on (and engine bogs down) at 0:02. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. If the car is not moving and it's very hot outside, there is no way to cool the radiator except by operating the fan. When the ac is of the radiator hoses both become same heat after a while and the overflow reservoir starts boiling over and the fan do not kick in. The trigger is the thermostat in the radiator of your vehicle. There are a couble of ways this can happen. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. 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 !! The Toyota's fan only turns on when the coolant reaches a certain temperature, which is measured by a sensor. I just bought 2012 chevy Cruze 1lt and it was fine for first 4 drives but now as soon as I turn that ignition, after literally 2 seconds the radiator fan comes on and stays on. Ok. Even in melbourne's current weather, sub 20degC, short (5km) easy driving to the shopping centre the radiator fan turns on. Looked everywhere and can't find anything about this. That can't be the case because the fan would run all the time, key off included. 2008 track model with about 18,000km. Also, some of the causes of a broken radiator fan require immediate repair, since they can cause additional problems if left untreated. 3. It takes a long time for the engine to heat up. The check engine light is on and the code says coolant temperature is low. My 2013 Hyundai i10 has one fan and as far as I can see one coolant temp sensor. Why would your car heater not work Car radiator giving bubbles but they go away when you turn AC on or when radiator fan turns on? They run from the time i turn the truck on to the time I shut it off. ... the radiator fan starts … Your radiator fan has stopped working, and although it’s not an end-all-be-all, it will be a lot more comfortable cruising in your car with a working fan. General Car Repair × How Does a ... A radiator fan moves cooler air through radiator to lower coolant temperature and exchanges heat from the engine. The high speed fan comes on at 235ºF . The Radiator fan will come on if you have the selector in the blue, or defrost setting. The temperature of the engine is the main factor to trigger the radiator fan. 8 people found this helpful. It … It's quite annoying. This cycles on and off for about a few minutes. The radiator fan turns on at cold startup. As some point along her 20 mile trip the radiator cooling fan came on. If it stops working, your engine could overheat and be damaged. Radiator Fan stays on.