To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. When you're driving, air flows through the car radiator to keep your engine a normal temperature. You will see a plug that plugs into it. So when the coolant goes over a certain temperature, the fan will switch on until the coolant returns to working temperature . Also, just turning on the AC should have both fans spinning, so if you start overheating, turn the AC on and keep the temp set higher, that way both fans will be cooling the radiator. After another 5 minutes the electric radiator fan should turn on at its low speed. So I thought the fan temp. What temperature does the radiator fan turn on at? A failed sensor can cause the fan to run excessively or not run when cooling is needed. I replaced water pump and radiator and coolant temp sensor. 1) Both fan should turn on with the A/C, right? 2008 track model with about 18,000km. Radiator fan not comming on - Hello I have a 2002 honda civic ex. That water temp seams way out of line. I was letting mine run for awhile at idle (too cold to ride it). it is right below the radiator cap. At what temperature should my radiator cooling fan come on in my 2011 Honda Ridgeline.? Most Japanese cars have a normally closed switch. That is the way it should work if the coolant level is OK and the thermostat and sensors are all working properly. Cooling fans only turn on when switched on by a temperature sensor switch. Conclusion But if you stop, for example in a traffic jam, your engine has to use an electric cooling fan to force air through the radiator. Answer Save. To check this, unplug the single wire connector and, using a jumper wire, ground it. To Test: 1. I bought a preowned s320 recently, and notice that the radiator fans started to turn about 5 seconds after ignition switch is on, and even before starting the car. To test it, locate it on the radiator. Theoretically, the radiator outlet and water pump should be the "coolest" part of the car's cooling system when the engine is at operating temperature and the thermostat is open. Could my radiator fan be perfectly OK? My 2013 Hyundai i10 has one fan and as far as I can see one coolant temp sensor. Your air conditioning creates extra work, and heat, for yur engine. I think my thermostat is 190 degrees, "don't quote me on that because I'm not at the shop right now." The ECT sensor monitors the coolant temperature, and allows the fan to turn on if the coolant is too hot. Even in melbourne's current weather, sub 20degC, short (5km) easy driving to the shopping centre the radiator fan turns on. While sitting in backed up traffic, temps based on the digital dash go up to 226. Thanks:cheers: peugeot 206 HDI? With the bike off and key removed, disconnect its harness. 3. Both fans turn on when the air conditioner is turned on. I'd consider changing thermostat if you're over 80K, and definitely suspect that cooling fan cause something isn't right. When I turn on the ac the fan works and keeps the car cool. This sensor switches the cooling fan off and on as needed. This is what controls when the fan goes on and off. Next, take the fan blade and turn it, the fan blade should free wheel, if you cannot turn the fan blade the clutch has locked up and needs to be replaced. It should not rise more than a couple tenths of an inch hereafter. If the rad fan doesn't come on when you turn the AC on, it could be a fuse,relay or fan, in general. Disconnect the Engine Coolant Temperature Sensor (ECT). Just because the radiator fan is not on does not mean that it is not working. Thermo switch controls when fan goes on. The fan is temperature-controlled to make sure that the engine gets enough cool air to avoid overheating. 3) I've read that the radiator fan won't kick in until 213 degrees. I have a 1998 Ford Contour 4 Cyl and the needle on the temperature guage gets just below the red area before the radiator fans turn on. If you start your car and turn your defrost on high hot, your cooling fan should come on. If the radiator fan is in working condition, move on to the next step. The second time the fan comes on is with your AC. There are a couple of systems on a Jeep, 1 system has a regular fan that is driven by the engine and an electric fan that is turned on with the A/C, the other system has a fan that is driven by the power steering pump and no electric fan, and the last system I've seen has 2 electric fans, one is turned on by the engine temp around 220 degrees and the other fan is turned on with the A/C. so today i left the car running in the sun until the temp guage read 100 degrees but the fan didnt come on. today i installed an electric fan and new aluminum radiator, now i need to know what temp to set the relay on to switch on the electric fans? 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