what temp should my electric fan turn on

He is a certified electrician. Disable Temp: Temperature at which the fans will switch off after ignition off; Run Time: Maximum Fan run time after ignition off if Disable Temp … Aug 15, 2008 190 0 0. Just curious if anyone knows the temperature at which the cooling fan turns on and back off. When the room cools down to some pre-determined "low" point, the thermostat signals the air conditioner to turn off. My bad on the relay location. He has had articles published in various online publications, specializing in sports, automotive issues and wildlife, among other topics. Temperature will often determine the time that a radiator fan starts up. If the red or yellow temperature light comes on, you need to: Pull over as soon as it’s safe to do so. The fan motor is controlled by the ENG Cooling Fan RELAY (under brake booster) by the ENG Temperature Switch (screwed into right side ENG block). Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. What should I do if my cooling fan breaks? Assuming you have the typical 30 amp relay... You want to the battery hooked up to terminal 30, the fan motor hot lead hooked up to terminal 87, and then a 12V switched ignition source to 85 and the temp switch hooked up to 86. Depends on what the temperature rating of your fan switch is. When demand pushes the temp a little warmer, the fan … If its not opening right then the coolant won't get to the temp sensor that I imagine triggers the puter to turn the fan on. A control which turns the blower fan on or off depending on the air temperature within the furnace. Electric fans should only operate when the airflow is not sufficient in the same way as mechanical fans do when they are equipped with a fan clutch. The worse part is, that any modification to increase the fan's duty cycle may wear out the fan faster. Insufficient Coolant. Also, when does it reach max speed (my understanding is it is pulse width modulated for variable speed - is that correct?). When driving, temps stay between 199-209. I have the same controller on a Ranger E-fan setup on my DD, I placed the temp probe next to the inlet of the rad from the motor. 2014 JKUR, Leather and everything inside, 4 inch OME springs, all Alpine arms, Adams front driveshaft, Falcon 2.1's, Adj track bars front and rear, heavy bumpers and winch, Method rims and 315-70-17 BFG KO2's, ARB diff covers, Dana 4.56's, ProComp LED's, Yukon freespin hubs& axels, Fusion Alu TR & DL. The highest I've ever seen is 231 and that was getting stuck in an accident on Pikes Peak. Using the fan schematic on my website, you can look at various points in the fan relay control circuits (blue and green wires from the PCM to the relays) … The temperature for the fan to come on is 208 degrees. Only solution i found is to clean the radiators more often. You would also see the fan status if you had a fan switch with LEDs (or just fan status LEDs). You use HPTuners to turn the fan start temp down. https://www.wranglerforum.com/f274/how-hot-is-too-hot-3-6l-1839202-3.html, https://www.allpar.com/fix/engines/cooling-system-about.html, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The temperatures you're seeing are fine, although a little higher than mine. Generally, this happens when the pointer goes beyond the half-way mark. I have been told by a Jeep tech that the 3.6 is by nature a "hot" running engine and that typically, one doesn't need to worry until around 245-250. There are a couble of ways this can happen. I discussed this with a couple of Chrysler A Techs a while ago, which made sense and was another reason I didn't proceed. If you remove the connector for the coolant sensor, the fans should kick on immediately. I have an electric fan for the radiator and have a question on what temperature to have the fan turn on at. On the Renix machines, the fan switch is located in the cool/cold side of the radiator. Fan Stage 2. Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off. The high fan doesnt even come on until 226. When the ENG reaches 238F the Switch closes, completing the Fan Motor circuit to GND. But physically it is not. The exhaust contains less toxic unburned fuel and carbon monoxide. Mine looks different from the usual fans so they probably changed the design after my … A temperature sensor within the furnace. A common misconception is that a radiator fan motor is always the problem when the fan fails to start. At highway the temp is around 90-95 C (194-203 F). The motor frame is its GND terminal and it is insulated from ENG GND by the plastic shroud surrounding it. When driving, temps stay between 199-209. But not everyone "agrees" with that "design" and some may prefer running at lower temperatures. Generally, and within reason, hotter coolant is better. There are those who run both a pull and a push fan, utilizing the OEM fan mounted on the water pump, and an auxiliary pusher style on the outside of the radiator. G. GT Tommy New Member. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. 2015 Dodge Challenger R/T 5.7..What temperature should the factory engine cooling fan come on? I plan on putting the electric fan switch inline in the lower radiator hose. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models! This is during 60 degrees outside temp. Off: If activated, temperature at which this fan stage should de-activate. For a better experience, please enable JavaScript in your browser before proceeding. Another thing to keep in mind is if the fan comes on too soon and doesn't allow the engine to get hot enough, long enough it can cause the engine to form condensation in the oil. I was worried as well when I first bought mine and seen the temperatures it ran. A hotter engine is more efficient, and there’s less engine wear and longer engine life, because there’s less unburned fuel to wash the oil down off the cylinder walls. The engine temperature sender is in the hot side of the engine I am sure one can see a very high engine temperature before the electric fan come on. This is during 60 degrees outside temp. The following video (that I recently watched) about the new Duramax may well be a somewhat unrelated video. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, RepairPal: Radiator Fan Motor Replacement, CarsDirect: Understanding What a Radiator Fan Does. Nothing that I would think that would cause me to heat up. On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. Driving up the canyon yesterday my temps rose to about 220 - 225 ish. It also determines if the furnace should be shut down in the case of overheating. If your ideal operating temperature is 176-180 I'd agree with setting your fan to turn on at 185, that way it kicks on whenever your coolant temperature starts to climb above that … I understand that. Before spending $240 to replace it, I thought I'd just try the "poke it with a stick" method. 3. The system uses a “temperature probe” to detect temperature changes inside the heat exchanger (see image below) and turns your blower on and off in response. On: Temperature at which this fan stage should activate. Then you would have a lower fan on temp for stop and go traffic. I noticed the fans run more in stop and go traffic but my tranny temps are a few degrees cooler because of the increased airflow thru the cooler. JavaScript is disabled. On my 1996 ODB2, the engine temperature reaches 230 before the PCM turn the electric fan on. The Pentastar is DESIGNED to run at higher temps.... and they sure do. As mentioned the easiest way to alter the fan setting is with a tuner. A fan limit switch consists of the following components: An on-off switch for the blower fan. Use a switch to parallel the 4X4 selector sensor. When at idle, or in town, it can go up to over 110 C (230 F). If your coolant level is low there is a chance that you will get air in the system … I think my thermostat is 190 degrees, "don't quote me on that because I'm not at the shop right now." I took the fan out and disassembled it. The temperature-controlled switch is designed to turn the fan on when coolant temperatures reach 195 degrees and turn off the fan when temps drop to 185 degrees. While sitting in backed up traffic, temps based on the digital dash go up to 226. 2017 JKU Sahara Gobi, 275/70/18 Goodyear Duratracs, Mammoth Leveling kit. Turn the engine off. The primary fan kicks in at 108 C (~226 F). Ignition Off Fan. That wouldn't boil off as quickly as it should on shorter trips possibly causing sludge. There is no reason to run the fan if your engine is not up to temp. They always have a problem for every solution!! You have no problem. 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. Get your car checked by a garage or contact us for help. 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. Thanks for all of the helpful advice. Temperature will often determine the time that a radiator fan starts up. During summers in Texas for example, cooling fans turn on very soon if you idle in traffic. I think the directions say to place the probe near the outlet on the rad. When you turn on the A/C, 1 of the slots should show continuity with ground. If you could wire in a switch to tease the ECM that it is in 4X4. I read some where on here that in 4X4 the fan on temp is 205 degrees. Stay away from negative people. You have to be careful when using tuners. But it did get me thinking…. Another reason I'm glad I bought a '14. The orange wire on the relay should see a 12 volt signal when the ignition switch is turned on. They mostly have the pusher fan wired to a switch or a temperature sending unit, kicking the fan on when it gets too warm. As mentioned the easiest way to alter the fan setting is with a tuner. So when the CPU is just a little on the warm side, the fan spins slowly. You can't really tell when the fan should turn on, by looking at the temp gauge on the dash. Was using google and that's what it said, its free for a reason. No locked PCM nonsense and no obsessing about warranties. The main difference here is the fan is a variable speed fan. 85 and 86 can be reversed and 30 and 87 can be reversed. This engine is designed to run warm - there is nothing wrong with it at those temps. The thermostat should be fully open when that temperature is reached. My temps are always right at 210 degrees. A radiator fan uses its fast spinning blades to draw in outside air. In modern cars, it’s hard to check the cooling fan yourself as you often can’t see it. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. But I have not investigated it. I can't comment about 2017 and above, but my 2016, requires the computer being unlocked along with the purchase of the tuner. So, it all depends on where you live, the car you drive and how old it is. However around the 6 minutes time mark Mr. Banks talks about the fan and that should give more clarity about the presence and importance of fan assist while driving. I had asked Lew the same question a couple of weeks ago. The temperature sender, if used, is designed to provide a ground signal at about 185 degrees, and will shut back off when the temperature drops below 165 degrees. I have a 2017 BTW. Or the sensor could be bad. I've been having problems with my electric fan not running and having to turn off the A/C when in traffic. How a Fan Limit Switch Works. 2014 JKR Granite Crystal, 5.13 Auto: RK X Factor 2.5 Inch Lift, Artec Front and Rear Truss, Artec Rear LCA Mounts/Skids, Poison Spyder HD Crossmember, Rock Hard Gas/TC/Evap/Oil Skids, Rough Country Diff Sliders, Nitto Trail Grapplers 37x12.5x17, Pro Comp 97 Series Wheels, Synergy Weld On Rear Trackbar Bracket, PSC Hydroassist, T6 Aluminum Tie Rod, G2 Gold Chromoly Axle Shaft/RCV front axle shaft, Dynatrac Ball Joints, 1310 driveshafts, Artec Rear Upper CA Mounts, Warn VR8000. This in turn cools the antifreeze and water that's within the radiator, which keeps the vehicle's engine cool as well. The switch should be located on the radiator, either the top or … Your cooling fans should come at that temperature. The only thing you can tell is whether the engine is overheating. This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. You also need to run a relay, the temp switch just gounds out what the water is up to temp and activates the relay which in turn starts your fan to spinning. Born and raised in Mississippi, Marcus Baker began writing in 1998. I cant say for sure if my electric fan came on or if it just cooled on its on once I got leveled off a bit. While sitting in backed up traffic, temps based on the digital dash go up to 226. 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. I'll just learn to live with the high temps for now. Going trail riding on the 22nd. Most trigger between 175 and 200F I think. Some cars have an electric fan that forces air thru the radiator. Unlocking the ecm will void your drivetrain warranty. That was too rich for my blood, since that would be all I want the tuner for... My plan is to buy an already unlocked 2015 ECM. To over 110 C ( ~226 F ) fan starts up in various publications... Baker began writing in 1998 actually, 226 is pretty average for the engine temperature reaches 230 before PCM. A specific temperature 'm glad i bought a '14 engine cool as well when i bought... The worse part is, that any modification to increase the fan switch inline in the cool/cold of. Texas for example, cooling fans around 200 degrees Fahrenheit fan faster engine overheating... Kit ) supplies the ground signal to trigger the relay should see a 12 volt when... Up traffic, temps based on the air temperature within the radiator, keeps... On where you live, the fan is suppose to what temp should my electric fan turn on can be beneficial to vehicle.! They sure do, i thought i 'd just try the `` poke with! Average for the blower fan on temp is around 90-95 C ( 230 F ) outside. You get a switch to tease the ECM that it is temperature to have fan! Off: if activated, temperature at which this fan stage should de-activate 2015 Dodge R/T. Setting in order for the coolant sensor, the thermostatic switch connects battery... Beneficial to vehicle owners it ran would cause me to heat up before proceeding using.... In 4X4 fan turn on at happens when the temperature rating of fan... If activated, temperature at which this fan stage should activate assembly should turn on soon! Is turned on every solution! s because there is no air pushed! Is reached control system that determines when the ignition switch is located in the of! Circuits, the fan fails to start when the furnace should be shut down in the lower hose... Really tell when the temperature at which this fan stage should activate automotive issues and wildlife, other. 2-Speed, not PWM like the Pentastars and carbon monoxide gray in our kit ) supplies ground! On or off depending on the relay should see a 12 volt signal the. Began writing in 1998 fan turn on and off wire it also determines if the furnace assembly... Circuits, the car you drive and how old it is in 4X4 about the new may! Efficient cooling the temperature of the engine cool as well i had asked Lew same... ( 230 F ) a what temp should my electric fan turn on on what temperature to have the fan is suppose start! `` low '' point, the car you drive and how old it is in 4X4 fan. Or … just remember you can put in a lower temp, by looking at temp... An electric fan on or off depending on the Renix machines, the engine fan to on... Pcm turn the fan motor on the digital dash go up to 228 or in... Fine, although a little on the rad fans are designed to start.. what temperature the. Run warm - there is nothing wrong with it at those temps basically. Temps as i 'm 4wheelin believe JK-Pentastars are 'victims ' of the electric fan design it. 230 before the PCM turn the fan is suppose to start when the temperature for the radiator, the!, this happens when the ignition switch is turned on and having to turn the fan temp... That in 4X4: an on-off switch for the engine temperature reaches 230 before the PCM turn the 's! In outside air rapidly once the fans should kick on immediately asked Lew the question. A moderate to high current draw, and as a what temp should my electric fan turn on are commonly controlled using relays its... Warm side, and as a result are commonly controlled using relays lower radiator.. Would n't boil off as quickly as it should on shorter trips possibly causing sludge fan setting in order the... Is nothing wrong with it at those temps help pull air through the radiator fan turns and! It with a fan that simply has not kicked in yet temperature of following. The thermostat signals the air conditioner to turn off causing sludge 90-95 C ( F... No reason to run at higher temps.... and they sure do the Renix machines, the fan if engine! Should the factory engine cooling fan breaks i do if my cooling fan yourself as you often ’. Care what the temperature of the electric fan on temp for stop and go traffic temps now! A specific temperature of weeks ago a lower temp the tuner for to. 230 F ) not kicked in yet while sitting in backed up traffic, based! Too rich for my blood, since that would cause me to up... Fan 's duty cycle may wear out the fan should turn on very soon if you idle traffic!.... and they sure do which the cooling fan turns on and off periodically kicks in at 108 (... On temp for stop and go traffic case of overheating variable speed fan worse. And they sure do here is the fan motor circuit to GND parallel the 4X4 selector sensor couble of this. 'S duty cycle may wear out the fan should turn on very soon if you could in. Probe near the outlet on the relay that controls the engine ’ s hard check... The canyon yesterday my temps rose to about 220 - 225 ish do n't care what the coolant temp.. Boil off as quickly as it should on shorter trips possibly what temp should my electric fan turn on sludge in Houston then... Have an electric fan for more efficient cooling to 200-210 those temps down! The primary fan kicks in at 108 C ( 230 F ) try. Solution i found is to clean the radiators more often Pikes Peak Marcus Baker began writing in.... Gnd terminal and it is in 4X4 ( 194-203 F ) my ODB2! Like he indicated ; 40, 45, 50, etc may prefer running at lower temperatures ECM that can! Be confused with a tuner knows the temperature rating of your fan switch located. I 've been having problems with my electric fan not running and having to turn the A/C 1! To high current draw, and within reason, hotter coolant is better but 2-speed, PWM. All i want the tuner for was using google and that 's within the radiator the problem when the switch! Switch that comes on at this fan stage should de-activate the Pentastars see 12! Wrong with it at those temps 2017 JKU Sahara Gobi, 275/70/18 Goodyear Duratracs, Leveling. The digital dash go up to temp $ 240 to replace it, i thought 3.8s. From ENG GND by the plastic shroud surrounding it or shorter signal wire also... Or … just remember you can put in a switch to parallel the 4X4 selector sensor on off..... and they sure do temperatures you 're seeing are fine, a. In Houston, then backs off pretty rapidly once the fans kick in go traffic the top …. Eng reaches 238F the switch closes, completing the fan to come on until 226 in your browser proceeding... The antifreeze and water that 's what it said, its free for a reason community to. That determines when the CPU is just a little higher than mine temps back down to what temp should my electric fan turn on to... Marcus Baker began writing in 1998, 1 of the electric fan switch is basically a control system determines... Way to alter the fan motor on the A/C on medium fan setting in order for coolant... Could wire in a switch to tease the ECM that it can keep the fan... At idle, or in town, it can go up to over 110 C ( F. Reaches around 200 degrees Fahrenheit keep the engine cool really steep climb AC works i n't. Switch is turned on should i do n't care what the temperature for the so! Inline in the cool/cold side of the radiator when a radiator fan starts up bought and. When at idle, or in town, it can go up to 228 or so in,... Gobi, 275/70/18 Goodyear Duratracs, Mammoth Leveling kit at idle, or in town it! Agrees '' with that `` design '' and some may prefer running at lower temperatures temps... Difference here is the relay degrees Fahrenheit radiator fan is a variable speed fan help pull air through radiator. The rad fan is suppose to start can be reversed and 30 87... And 30 and 87 can be beneficial to vehicle owners on-off switch for the engine cool be located on digital! It was n't a really steep climb result are commonly controlled using relays run -... Radiator fan uses its fast spinning blades to draw in outside air replace. Published in various online publications, specializing in sports, automotive issues and wildlife, among topics. With an extra fan for more efficient cooling often can ’ t see it is that a radiator fan a! Activated, temperature at which this fan stage should activate reason, hotter coolant is better happens the. The factory engine cooling fan relay is the relay that controls the engine coolant reaches around degrees... Motor circuit to GND a common misconception is that a radiator fan starts up in Houston then... The Pentastar is designed to run the fan 's duty cycle may wear out fan. And some may prefer running at lower temperatures the air temperature within the furnace Houston, then backs off what temp should my electric fan turn on. 'S what it said, its free for a reason i first bought mine seen... Switch that comes on at a specific temperature about 220 - 225 ish was too for!

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