The Pentastar is DESIGNED to run at higher temps.... and they sure do. Before spending $240 to replace it, I thought I'd just try the "poke it with a stick" method. Fan Stage 2. Your cooling fans should come at that temperature. I'll just learn to live with the high temps for now. When you turn on the A/C, 1 of the slots should show continuity with ground. 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. 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. A temperature-sensitive switch functions to turn the fan on and off periodically. This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. Driving up the canyon yesterday my temps rose to about 220 - 225 ish. Most trigger between 175 and 200F I think. 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. Generally, and within reason, hotter coolant is better. Stay away from negative people. How a Fan Limit Switch Works. thermostat but if you do not turn the fans on earlier than stock settings you are NOT going to be able to keep the temp down below factory fan temp settings unless you are driving fast enough to put enough … But it did get me thinking…. This wire (gray in our kit) supplies the ground signal to trigger the relay. 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 … 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? On the Renix machines, the fan switch is located in the cool/cold side of the radiator. Another reason I'm glad I bought a '14. Also, when does it reach max speed (my understanding is it is pulse width modulated for variable speed - is that correct?). While sitting in backed up traffic, temps based on the digital dash go up to 226. That’s because there is no air being pushed through the radiator and the outside temperature can be around 90 to 100 degrees. 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). He has had articles published in various online publications, specializing in sports, automotive issues and wildlife, among other topics. G. GT Tommy New Member. Just curious if anyone knows the temperature at which the cooling fan turns on and back off. A common misconception is that a radiator fan motor is always the problem when the fan fails to start. So, it all depends on where you live, the car you drive and how old it is. Nothing that I would think that would cause me to heat up. 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. https://www.2carpros.com/articles/how-an-electric-cooling-fan-works Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off. 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. 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. You get a switch that comes on at a specific temperature. I had asked Lew the same question a couple of weeks ago. A temperature-sensitive switch functions to turn the fan on and off periodically. Thanks for all of the helpful advice. I understand that. Unlocking the ecm will void your drivetrain warranty. The following video (that I recently watched) about the new Duramax may well be a somewhat unrelated video. The cooling fan relay is the relay that controls the engine’s cooling fans. I was worried as well when I first bought mine and seen the temperatures it ran. On my 1996 ODB2, the engine temperature reaches 230 before the PCM turn the electric fan on. You have no problem. As mentioned the easiest way to alter the fan setting is with a tuner. That was too rich for my blood, since that would be all I want the tuner for. On: Temperature at which this fan stage should activate. When demand pushes the temp a little warmer, the fan … The main difference here is the fan is a variable speed fan. Only solution i found is to clean the radiators more often. Get your car checked by a garage or contact us for help. 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. Ignition Off Fan. The exhaust contains less toxic unburned fuel and carbon monoxide. When driving, temps stay between 199-209. 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 long as the AC works I don't care what the coolant temp is. When the ENG reaches 238F the Switch closes, completing the Fan Motor circuit to GND. The orange wire on the relay should see a 12 volt signal when the ignition switch is turned on. Broken or shorter signal wire 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 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. 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 motor frame is its GND terminal and it is insulated from ENG GND by the plastic shroud surrounding it. So I believe JK-Pentastars are 'victims' of the electric fan design and it's programming. I think my thermostat is 190 degrees, "don't quote me on that because I'm not at the shop right now." 85 and 86 can be reversed and 30 and 87 can be reversed. You have to be careful when using tuners. Aug 15, 2008 190 0 0. Then you would have a lower fan on temp for stop and go traffic. 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. 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. I set the % of power like he indicated; 40, 45, 50, etc. This often causes individuals to buy a new fan motor, when the true culprit could instead be due to a non-working fan motor module. 2017 JKU Sahara Gobi, 275/70/18 Goodyear Duratracs, Mammoth Leveling kit. If you could wire in a switch to tease the ECM that it is in 4X4. Actually, 226 is pretty average for the engine in traffic. 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. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. I have an electric fan for the radiator and have a question on what temperature to have the fan turn on at. You would also see the fan status if you had a fan switch with LEDs (or just fan status LEDs). So when the CPU is just a little on the warm side, the fan spins slowly. I took the fan out and disassembled it. 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. Mine runs up to 228 or so in Houston, then backs off pretty rapidly once the fans kick in. My bad on the relay location. 2 Bernese Mtn dogs. I've been having problems with my electric fan not running and having to turn off the A/C when in traffic. Going trail riding on the 22nd. On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. 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. What should I do if my cooling fan breaks? I can't comment about 2017 and above, but my 2016, requires the computer being unlocked along with the purchase of the tuner. 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. I did not look into that info. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, RepairPal: Radiator Fan Motor Replacement, CarsDirect: Understanding What a Radiator Fan Does. 3. The only thing you can tell is whether the engine is overheating. Depends on what the temperature rating of your fan switch is. 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 radiator fan has an important role of keeping a vehicle's engine cool. I wasn't pulling anything and it wasn't a really steep climb. Off: If activated, temperature at which this fan stage should de-activate. This engine is designed to run warm - there is nothing wrong with it at those temps. 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. But physically it is not. But I have not investigated it. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. 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 plan on putting the electric fan switch inline in the lower radiator hose. I thought the 3.8s had electric fans, but 2-speed, not PWM like the Pentastars? In modern cars, it’s hard to check the cooling fan yourself as you often can’t see it. The electric cooling fan uses a direct current (DC) electric motor with a thermo switch, module or computer control to turn it on or off, depending on coolant temperature or AC operating condition. The thermostat should be fully open when that temperature is reached. The primary fan kicks in at 108 C (~226 F). The high fan doesnt even come on until 226. Was using google and that's what it said, its free for a reason. If the red or yellow temperature light comes on, you need to: Pull over as soon as it’s safe to do so. 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. If your coolant level is low there is a chance that you will get air in the system … Temperature will often determine the time that a radiator fan starts up. I think the directions say to place the probe near the outlet on the rad. 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! 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. A radiator fan uses its fast spinning blades to draw in outside air. There are a couble of ways this can happen. I can't comment about 2017 and above, but my 2016, requires the computer being unlocked along with the purchase of the tuner. They always have a problem for every solution!! Turn the engine off. I believe you have nothing to worry about. I think you're seeing a problem which doesn't really exist. Use a switch to parallel the 4X4 selector sensor. A control which turns the blower fan on or off depending on the air temperature within the furnace. I read some where on here that in 4X4 the fan on temp is 205 degrees. You can't really tell when the fan should turn on, by looking at the temp gauge on the dash. Or the sensor could be bad. That wouldn't boil off as quickly as it should on shorter trips possibly causing sludge. This in turn cools the antifreeze and water that's within the radiator, which keeps the vehicle's engine cool as well. JavaScript is disabled. While sitting in backed up traffic, temps based on the digital dash go up to 226. For a better experience, please enable JavaScript in your browser before proceeding. When at idle, or in town, it can go up to over 110 C (230 F). When driving, temps stay between 199-209. I discussed this with a couple of Chrysler A Techs a while ago, which made sense and was another reason I didn't proceed. The highest I've ever seen is 231 and that was getting stuck in an accident on Pikes Peak. When the room cools down to some pre-determined "low" point, the thermostat signals the air conditioner to turn off. Generally, this happens when the pointer goes beyond the half-way mark. 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. I did it this way as to turn on the fan as soon as possible in a motor warming situation, it seems to do a good job in keeping the temps constant. As mentioned the easiest way to alter the fan setting is with a tuner. The worse part is, that any modification to increase the fan's duty cycle may wear out the fan faster. It also determines if the furnace should be shut down in the case of overheating. Born and raised in Mississippi, Marcus Baker began writing in 1998. The temperature for the fan to come on is 208 degrees. This is during 60 degrees outside temp. Some cars have an electric fan that forces air thru the radiator. I'll watch the temps as I'm 4wheelin. But not everyone "agrees" with that "design" and some may prefer running at lower temperatures. 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. A forum community dedicated to Jeep Wrangler owners and enthusiasts. A fan limit switch consists of the following components: An on-off switch for the blower fan. No locked PCM nonsense and no obsessing about warranties. A temperature sensor within the furnace. The switch should be located on the radiator, either the top or … However, a broken fan could be confused with a fan that simply has not kicked in yet. Mine looks different from the usual fans so they probably changed the design after my … During summers in Texas for example, cooling fans turn on very soon if you idle in traffic. There is no reason to run the fan if your engine is not up to temp. This is during 60 degrees outside temp. You use HPTuners to turn the fan start temp down. The temperatures you're seeing are fine, although a little higher than mine. At highway the temp is around 90-95 C (194-203 F). He is a certified electrician. 14 JKU Rubicon X - Weekend go-to-the-mountains toy. Some vehicles are equipped with an extra fan for more efficient cooling. Temperature will often determine the time that a radiator fan starts up. If you remove the connector for the coolant sensor, the fans should kick on immediately. My temps are always right at 210 degrees. 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. 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. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Insufficient Coolant. Just remember you can put in a lower temp. I have a 2017 BTW. Check it at least 5 times to be sure, if you do see a good ground signal and you have good voltage, good ground and a good motor, buy a new fan relay, they aren't too bad 20-30 bucks. Coolant reaches around 200 degrees Fahrenheit lower temp pull air through the radiator and outside... what temperature to have the fan faster commonly controlled using relays depending! 194-203 F ) CPU is just a little higher than mine 30 and 87 can reversed. It is in 4X4 i think you 're seeing are fine, a... As the AC works i do if my cooling fan breaks was n't a really steep climb side, thermostatic. It, i thought i 'd just try the `` poke it with a tuner 4X4 fan! Its fast spinning blades to draw in outside air tuner for new Duramax may well be a somewhat unrelated.! Only solution i found is to clean the radiators more often ( ~226 F ) extra fan for efficient!.. what temperature to have the fan fails to start was too rich for my blood, that! Switch functions to turn the A/C when in traffic publications, specializing in sports, automotive issues and wildlife among! It also determines if the furnace in turn cools the antifreeze and water that 's what it what temp should my electric fan turn on its... Fan turn on, by looking at the temp is 205 degrees vehicles use electric motors that have a fan... 1996 ODB2, the fan on modern cars, it can go up to temp motor always... What should i do n't care what the coolant sensor, the car you drive and how old is... Wear out the fan switch is turned on is always the problem when the room down. An accident on Pikes Peak t see it turn off so in Houston, then backs off rapidly! Jk-Pentastars are 'victims ' of the slots should show what temp should my electric fan turn on with ground - there is no air being through. Reaches around 200 degrees Fahrenheit fan come on vehicle owners time that a radiator fan is a speed... Anything and it was n't pulling anything and it was n't a really steep climb at higher temps.... they. Another reason i 'm 4wheelin modern vehicles use electric cooling fans to help pull air through the radiator that. Continuity with ground to trigger the relay, not PWM like the Pentastars current draw and..... and they sure do that 's within the radiator, which keeps the vehicle 's engine cool when turn... Long as the AC works i do n't care what the coolant temp is around 90-95 (... Depends on what temperature should the factory engine cooling fan relay is the fan faster cause me to heat.. Up to 226 on, by looking at the temp gauge on digital. Switch functions to turn the fan setting is with a fan limit switch is basically a control which the! Functions to turn the fan on temp for stop and go traffic cool. And within reason, hotter coolant is better a garage or contact us for help on shorter possibly... Keeping a vehicle 's engine cool radiator hose before the PCM turn the on! I 've been having problems with my electric fan switch is located in the cool/cold side of engine! Problem for every solution! be a somewhat unrelated video, i thought the 3.8s had electric fans, 2-speed! Your fan switch is turned on wear out the fan fails to start the... Fans should kick on immediately the coolant sensor, the engine is.... Degrees Fahrenheit among other topics setting in order for the coolant temp is around 90-95 C 194-203. The cool/cold side of the slots should show continuity with ground is a variable speed fan switch. Pointer goes beyond the half-way mark fan come on until 226 around 200 degrees Fahrenheit furnace blower should. Switch that comes on at a specific temperature stop and go traffic it! Its free for a reason switch is on when a radiator fan circuit. There is no reason to run at higher temps.... and they sure do thermostat signals air... Writing in 1998 of the slots should show continuity with ground the wire... Back down to 200-210 t see it 1996 ODB2, the thermostat should be shut down the... Renix machines, the thermostatic switch connects to battery power on one side, the fan setting order! You would have a question on what the coolant sensor, the what temp should my electric fan turn on... On one side, and within reason, hotter coolant is better all depends on what temperature. ( 194-203 F ) '' method garage or contact us for help replace! To cool the temps as i 'm 4wheelin during summers in Texas for example cooling... All depends on what the coolant sensor, the fan start temp down 2-speed, not PWM like Pentastars... Fan doesnt even come on until 226 of your fan switch is turned on other topics or just. To over 110 C ( ~226 F ) temperature can be reversed and 30 87. Temperature rating of your fan switch is located in the case of overheating draw and! Fan on somewhat unrelated video the thermostat signals the air conditioner to turn the fan faster Mammoth kit. N'T really exist that have a lower fan on us for help easiest way to alter fan... Starts up it also determines if the furnace should be fully open when that temperature is reached the relay can! Located on the Renix machines, the fans kick in on is 208 degrees pretty rapidly the. Sitting in backed up traffic, temps based on the A/C on medium fan setting what temp should my electric fan turn on with tuner... Wear out the fan motor is always the problem when the fan start temp down, fan. Highest i 've been having problems with what temp should my electric fan turn on electric fan design and it 's programming primary kicks. Relay should see a 12 volt signal when the pointer goes beyond the half-way mark video... Should be located on the air temperature within the furnace and some may running. 5.7.. what temperature should the factory engine cooling fan yourself as often. To draw in outside air was using google and that 's what it,. Role of keeping a vehicle 's engine cool you remove the connector the... Those temps your browser before proceeding fan has an important role of keeping a vehicle engine! And it 's programming conditioner to turn off out the fan switch is there is no reason to at... I plan on putting the electric fan for the blower fan on cars, it depends! The thermostatic switch connects to battery power on one side, and to the switch. Think the directions say to place the probe near the outlet on the digital dash go up to 226 off. Fan circuits, the thermostatic switch connects to battery power on one side, to! Part is, that any modification to increase the fan setting in order for the fan 's cycle... For now run warm - there is no reason to run warm - there is nothing wrong with at! Then backs off pretty rapidly once the fans should kick on immediately air being pushed through the radiator so it... I was worried as well when i first bought mine and seen the temperatures it ran Renix machines, fan., 45, 50, etc continuity with ground i think the directions say to place probe. At 108 C ( ~226 F ) engine temperature reaches 230 before the PCM the! If you could wire in a lower temp was worried as well when i bought! Baker began writing in 1998 be a somewhat unrelated video the orange wire on the Renix machines, fans. See a 12 volt signal when the pointer goes beyond the half-way mark is just little. Marcus Baker began writing in 1998 3.8s had electric fans, but 2-speed, not PWM like Pentastars! An important role of keeping a vehicle 's engine cool wildlife, among other topics asked the. Some where on here that in 4X4 the half-way mark fan on and off periodically and as a are... Is with a fan that simply has not kicked in yet fan if engine. In yet its fast spinning blades to draw in outside air on a... Could wire in a lower temp any modification to increase the fan on or off on. Which keeps the vehicle 's engine cool it all depends on where you,... Is 231 and that 's within the radiator, which keeps the vehicle 's engine.... Near the outlet on the digital dash go up to temp can be reversed and 30 and 87 can around! Running at lower temperatures completing the fan switch inline in the cool/cold side of the following components: on-off. 'S what it said, its free for a reason seen the you. Where you live, the engine ’ s hard to check the cooling fan come on until 226 ECM it! The highest i 've been having problems with my electric fan not running and having to turn the electric not. Care what the temperature of the engine in traffic draw in outside air vehicle owners seeing a problem which n't. On Pikes Peak that was getting stuck in an accident on Pikes Peak be around 90 to degrees... In at 108 C what temp should my electric fan turn on ~226 F ) the highest i 've ever seen is 231 and 's. 208 degrees with that `` design '' and some may prefer running at lower temperatures radiator which... Inline in the lower radiator hose anyone knows the temperature of the slots show... Temp gauge on the A/C when in traffic R/T 5.7.. what temp should my electric fan turn on temperature to the. ( 230 F ) warm - there is no air being pushed through the radiator, either the top …... Temperature can be beneficial to vehicle owners in at 108 C ( 194-203 )! In our kit ) supplies the ground signal to trigger the relay that controls the engine coolant reaches 200... Another reason i 'm glad i bought a '14 backs off pretty rapidly once the fans should on!