Most trigger between 175 and 200F I think. I have to turn the A/C on medium fan setting in order for the engine fan to cool the temps back down to 200-210. If it reaches a certain point, the fan comes on to cool it off. The temperature gauge will still show at â¦ The engine cooling fan is designed to move air through the radiator when the vehicle is at slower speeds or stopped. The second time the fan comes on is with your AC. The low speed fan comes on at 224ºF. When I turn on the ac the fan works and keeps the car cool. The radiator fan relay is turned on whenever the A/C is commanded. With the bike off and key removed, disconnect its harness. I was letting mine run for awhile at idle (too cold to ride it). If that does not occur, replace the PCM. 2) Does each fan have it's own separate temperature sensor? When it reaches that temperature; the switch closes and turns the fan(s) on. I have an electric fan for the radiator and have a question on what temperature to have the fan turn on at. That water temp seams way out of line. Yes: About 220ish, radiator fan kicks on. I think my thermostat is 190 degrees, "don't quote me on that because I'm not at the shop right now." Could my radiator fan be perfectly OK? I replaced water pump and radiator and coolant temp sensor. My last vehicle the temperature the fan turned on was about 205F. With this in mind they decided that the fan should preempitively come on any time you use your AC. If the fan does not come on, something in the control circuit is defective. 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. It is the last line of defense between you and an overheating engine. I have a 1996 Corolla DX wagon with the 1.8 liter engine. - 2005 Chrysler PT Cruiser Does anyone know at what temperature range the fans are supposed to kick on 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. 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. Have replaced relays & fuses, fan comes on sometimes at around 235 but not always. Also Know, does radiator fan affect AC? 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. Where do I find the sensor? If your cooling fan stopped working, it could possibly be your coolant temperature sensor. When driving, temps stay between 199-209. Fans play an important role in keeping our systems cool and running at their best. To Test: 1. If you unplug it turn the bike on and take a wire and jump the plug the fan will turn on...that will eliminate the fan being your problem. I read that the coolant temp that causes the fans to kick in is precisely that temperature that you see on channel 49 on the air conditioning console. Different sizes and fin designs have a big impact on fan efficiency â¦ When you're driving, air flows through the car radiator to keep your engine a normal temperature. This is what controls when the fan goes on and off. You will see a plug that plugs into it. Step 4 â Check the engine coolant temperature (ECT) sensor. Both fans turn on when the air conditioner is turned on. If you start your car and turn your defrost on high hot, your cooling fan should come on. 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. 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. The temp got to 210 degrees before I turned it off. The switch should be located on the radiator, either the top or bottom. A failed sensor can cause the fan to run excessively or not run when cooling is needed. hi all, can anyone tell me what temperature the radiator fan on my focus 2001 1.6 petrol should cut in at? 1) Both fan should turn on with the A/C, right? 2008 track model with about 18,000km. 2 Answers. so today i left the car running in the sun until the temp guage read 100 degrees but the fan didnt come on. These switches open when the set temperature is reached thus turning the fan(s) on. This is during 60 degrees outside temp. If the rad fan doesn't come on when you turn the AC on, it could be a fuse,relay or fan, in general. the oil was reading 90 degrees if that helps. So when the coolant goes over a certain temperature, the fan will switch on until the coolant returns to working temperature . The PCM should recognize that the ECT is disconnected and turn the fans on within about 30 seconds. And i found out the fan turns on at around 225, I dont know, that just seemed kind of hot to me. Cooling fans only turn on when switched on by a temperature sensor switch. I just fixed a fan problem with my 84', the compressor switch had a bad connection. When ELSAWIN says stage 1 should cause the fan to come when the temperature is in the range 92C to 97 C, what sensor is this temperature meant to come from? 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. If the radiator fan is in working condition, move on to the next step. 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. That is the way it should work if the coolant level is OK and the thermostat and sensors are all working properly. (this one doesn't make sense. The ECT sensor monitors the coolant temperature, and allows the fan to turn on if the coolant is too hot. What temperature does the radiator fan turn on at? Mechanic's Assistant: How many miles are on the car? The first is based on your engine's coolant temperature. Helpful Information. Disconnect the Engine Coolant Temperature Sensor (ECT). I noticed that the fan did not come on. Depends on what the temperature rating of your fan switch is. im trying to test it to make sure it works but the temp keeps going up with no sign of a fan. At what coolant temperature does the electric radiator fan turn on? The radiator fan does not turn on, and the fuse for the fan. I plan on putting the electric fan switch inline in the lower radiator hose. 4. should the radiator cooling fan always run when the a/c is on? I got it hooked to the ac for power when the switch is powered on, but i need to adjust the temperature, FYI I have a mishmoto radiator, 180* thermostat, and two electric fans with a new shroud. Does anyone know when it is supposed to come on? Lower coolant temperatures will maximize engine performance and reduce engine wear. Each kit comes complete with switch, harness, hardware and instructions for easy installation. So now its just the coolant temperature sensor (under my tank) and radiator fan switch that could be faulty, right? Im not sure if the fan is working. peugeot 206 HDI? I'd consider changing thermostat if you're over 80K, and definitely suspect that cooling fan cause something isn't right. Your Chevy HHRâs radiator fan has one of the most important jobs on the vehicle. 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. The switches will turn on the main fan, auxiliary fan or both at a lower temperature. At this point the fan should come on. I also noticed that the coolant fan would not turn on any more. Usually notice when I've parked the car, ready to turn off engine. What temp should the fan come on? Answer Save. If the fan does not turn on, you will need to replace it. My 2013 Hyundai i10 has one fan and as far as I can see one coolant temp sensor. it is right below the radiator cap. They are designed to only run when needed. At what temperature should my radiator cooling fan come on in my 2011 Honda Ridgeline.? To test it, locate it on the radiator. Conclusion 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. I have an Ultragauge installed and noticed that the fan didn't turn on at 195F. Radiator fan testing points. Your air conditioning creates extra work, and heat, for yur engine. 2. Figure 3. The Toyota's fan only turns on when the coolant reaches a certain temperature, which is measured by a sensor. If so, I changed the low speed rad fan relay and it still won't run with a/c until the engine thermostat turns it on. But you can also test the fan relay system this way: While sitting idling, with the hood up so that you can observe the fan; just turn on the A/C. After another 5 minutes the electric radiator fan should turn on at its low speed. So I thought the fan temp. If the radiator fan is not working, itâs a serious problem. To check this, unplug the single wire connector and, using a jumper wire, ground it. lol. Generally, I understand that radiator fans should start only after coolant or engine temperture reaches a certain high temperature, and when cooling is required. So what's the breakdown of corvette years and the temperature at which the fans turn on? The level in the recovery tank should also have risen by between 1 and 1.5 inches. Just because the radiator fan is not on does not mean that it is not working. Thermo switch controls when fan goes on. Buffalo4 Even in melbourne's current weather, sub 20degC, short (5km) easy driving to the shopping centre the radiator fan turns on. Radiator fan not comming on - Hello I have a 2002 honda civic ex. Has the car been starting normally? Most Japanese cars have a normally closed switch. I pulled the plug off the temperature fan switch and jumped the two terminals together with a paper clip and the fan came on so all the wiring, fan and fan relay were good. 3. Temperatures may go as high as 220Â° or more while vehicle is parked with engine on .. fan should turn on shortly after a/c *compressor engages*.. Keep in mind the boiling point of antifreeze is higher than water. The high speed fan comes on at 235ºF . Most fans should come on when the coolant reaches about 200 to 230 degrees. Thanks:cheers: What temperature on a 2003 is the radiator fan supposed to come on? Our thermostats should be fully opened by 195 F/90 C, and cooling fan should be coming on by 210 F as far as I know. While sitting in backed up traffic, temps based on the digital dash go up to 226. This sensor switches the cooling fan off and on as needed. 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? It should not rise more than a couple tenths of an inch hereafter. Start the engine.