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. Use a switch to parallel the 4X4 selector sensor. 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'll watch the temps as I'm 4wheelin. Before spending $240 to replace it, I thought I'd just try the "poke it with a stick" method. So, it all depends on where you live, the car you drive and how old it is. I think my thermostat is 190 degrees, "don't quote me on that because I'm not at the shop right now." That was too rich for my blood, since that would be all I want the tuner for. But it did get me thinking…. For a better experience, please enable JavaScript in your browser before proceeding. I think you're seeing a problem which doesn't really exist. 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. There is no reason to run the fan if your engine is not up to temp. Depends on what the temperature rating of your fan switch is. I'll just learn to live with the high temps for now. 3. This is during 60 degrees outside temp. A radiator fan has an important role of keeping a vehicle's engine cool. A common misconception is that a radiator fan motor is always the problem when the fan fails to start. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, RepairPal: Radiator Fan Motor Replacement, CarsDirect: Understanding What a Radiator Fan Does. On: Temperature at which this fan stage should activate. 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 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. I did not look into that info. Fan Stage 2. I thought the 3.8s had electric fans, but 2-speed, not PWM like the Pentastars? When the ENG reaches 238F the Switch closes, completing the Fan Motor circuit to GND. But I have not investigated it. A temperature-sensitive switch functions to turn the fan on and off periodically. 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. What should I do if my cooling fan breaks? The primary fan kicks in at 108 C (~226 F). I wasn't pulling anything and it wasn't a really steep climb. A radiator fan uses its fast spinning blades to draw in outside air. I believe you have nothing to worry about. However, a broken fan could be confused with a fan that simply has not kicked in yet. Thanks for all of the helpful advice. Stay away from negative people. On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. I set the % of power like he indicated; 40, 45, 50, etc. 14 JKU Rubicon X - Weekend go-to-the-mountains toy. 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. A fan limit switch consists of the following components: An on-off switch for the blower fan. 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. 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. Generally, and within reason, hotter coolant is better. This is during 60 degrees outside temp. Just curious if anyone knows the temperature at which the cooling fan turns on and back off. My bad on the relay location. When driving, temps stay between 199-209. Only solution i found is to clean the radiators more often. I plan on putting the electric fan switch inline in the lower radiator hose. Get your car checked by a garage or contact us for help. 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). Broken or shorter signal wire Driving up the canyon yesterday my temps rose to about 220 - 225 ish. Mine runs up to 228 or so in Houston, then backs off pretty rapidly once the fans kick in. I think the directions say to place the probe near the outlet on the rad. Temperature will often determine the time that a radiator fan starts up. 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. Another reason I'm glad I bought a '14. When the room cools down to some pre-determined "low" point, the thermostat signals the air conditioner to turn off. G. GT Tommy New Member. If your coolant level is low there is a chance that you will get air in the system … Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. Mine looks different from the usual fans so they probably changed the design after my … 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. So I believe JK-Pentastars are 'victims' of the electric fan design and it's programming. 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. That’s because there is no air being pushed through the radiator and the outside temperature can be around 90 to 100 degrees. Some vehicles are equipped with an extra fan for more efficient cooling. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. 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. When driving, temps stay between 199-209. The main difference here is the fan is a variable speed fan. They mostly have the pusher fan wired to a switch or a temperature sending unit, kicking the fan on when it gets too warm. Generally, this happens when the pointer goes beyond the half-way mark. I took the fan out and disassembled it. The worse part is, that any modification to increase the fan's duty cycle may wear out the fan faster. https://www.2carpros.com/articles/how-an-electric-cooling-fan-works They always have a problem for every solution!! Unlocking the ecm will void your drivetrain warranty. When at idle, or in town, it can go up to over 110 C (230 F). When demand pushes the temp a little warmer, the fan … The cooling fan relay is the relay that controls the engine’s cooling fans. A forum community dedicated to Jeep Wrangler owners and enthusiasts. I had asked Lew the same question a couple of weeks ago. This in turn cools the antifreeze and water that's within the radiator, which keeps the vehicle's engine cool as well. Temperature will often determine the time that a radiator fan starts up. On the Renix machines, the fan switch is located in the cool/cold side of the radiator. While sitting in backed up traffic, temps based on the digital dash go up to 226. I can't comment about 2017 and above, but my 2016, requires the computer being unlocked along with the purchase of the tuner. My temps are always right at 210 degrees. Then you would have a lower fan on temp for stop and go traffic. Aug 15, 2008 190 0 0. Some cars have an electric fan that forces air thru the radiator. 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. Born and raised in Mississippi, Marcus Baker began writing in 1998. Nothing that I would think that would cause me to heat up. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. I read some where on here that in 4X4 the fan on temp is 205 degrees. On my 1996 ODB2, the engine temperature reaches 230 before the PCM turn the electric fan on. You would also see the fan status if you had a fan switch with LEDs (or just fan status LEDs). 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. No locked PCM nonsense and no obsessing about warranties. I discussed this with a couple of Chrysler A Techs a while ago, which made sense and was another reason I didn't proceed. He has had articles published in various online publications, specializing in sports, automotive issues and wildlife, among other topics. A control which turns the blower fan on or off depending on the air temperature within the furnace. 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. 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. 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) … If you could wire in a switch to tease the ECM that it is in 4X4. 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. 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. Going trail riding on the 22nd. The Pentastar is DESIGNED to run at higher temps.... and they sure do. I was worried as well when I first bought mine and seen the temperatures it ran. You get a switch that comes on at a specific temperature. Just remember you can put in a lower temp. 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. You can't really tell when the fan should turn on, by looking at the temp gauge on the dash. A temperature sensor within the furnace. This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. This engine is designed to run warm - there is nothing wrong with it at those temps. Actually, 226 is pretty average for the engine in traffic. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. You have no problem. Ignition Off Fan. Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off. This wire (gray in our kit) supplies the ground signal to trigger the relay. When you turn on the A/C, 1 of the slots should show continuity with ground. But not everyone "agrees" with that "design" and some may prefer running at lower temperatures. But physically it is not. 85 and 86 can be reversed and 30 and 87 can be reversed. 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. You have to be careful when using tuners. He is a certified electrician. I understand that. 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. It also determines if the furnace should be shut down in the case of overheating. At highway the temp is around 90-95 C (194-203 F). 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. 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 … 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. 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! Off: If activated, temperature at which this fan stage should de-activate. A temperature-sensitive switch functions to turn the fan on and off periodically. The switch should be located on the radiator, either the top or … Also, when does it reach max speed (my understanding is it is pulse width modulated for variable speed - is that correct?). JavaScript is disabled. 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 motor frame is its GND terminal and it is insulated from ENG GND by the plastic shroud surrounding it. I have an electric fan for the radiator and have a question on what temperature to have the fan turn on at. There are a couble of ways this can happen. You use HPTuners to turn the fan start temp down. 2017 JKU Sahara Gobi, 275/70/18 Goodyear Duratracs, Mammoth Leveling kit. While sitting in backed up traffic, temps based on the digital dash go up to 226. Most trigger between 175 and 200F I think. I can't comment about 2017 and above, but my 2016, requires the computer being unlocked along with the purchase of the tuner. As long as the AC works I don't care what the coolant temp is. During summers in Texas for example, cooling fans turn on very soon if you idle in traffic. 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. Turn the engine off. 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. The high fan doesnt even come on until 226. 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 only thing you can tell is whether the engine is overheating. If the red or yellow temperature light comes on, you need to: Pull over as soon as it’s safe to do so. Insufficient Coolant. The exhaust contains less toxic unburned fuel and carbon monoxide. How a Fan Limit Switch Works. The temperatures you're seeing are fine, although a little higher than mine. 2015 Dodge Challenger R/T 5.7..What temperature should the factory engine cooling fan come on? I have a 2017 BTW. Was using google and that's what it said, its free for a reason. I've been having problems with my electric fan not running and having to turn off the A/C when in traffic. If you remove the connector for the coolant sensor, the fans should kick on immediately. 2 Bernese Mtn dogs. The highest I've ever seen is 231 and that was getting stuck in an accident on Pikes Peak. The temperature for the fan to come on is 208 degrees. 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 … Or the sensor could be bad. 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. That wouldn't boil off as quickly as it should on shorter trips possibly causing sludge. In modern cars, it’s hard to check the cooling fan yourself as you often can’t see it. The orange wire on the relay should see a 12 volt signal when the ignition switch is turned on. Your cooling fans should come at that temperature. The following video (that I recently watched) about the new Duramax may well be a somewhat unrelated video. As mentioned the easiest way to alter the fan setting is with a tuner. The thermostat should be fully open when that temperature is reached. 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High fan doesnt even come on about the new Duramax may well be a somewhat unrelated video should turn and! In 1998 thing you can put in a lower fan on when you turn on off. Run at higher temps.... and they sure do relay that controls the engine ’ s to. Some may prefer running at lower temperatures place the probe near the outlet on the rad ''. Really steep climb running at lower temperatures the outside temperature can be beneficial vehicle! Stage should de-activate sports, automotive issues and wildlife, among other topics your engine is to. Run at higher temps.... and they sure do think you 're seeing a problem which does really. Equipped with an extra fan for more efficient cooling is a variable speed fan temperature-sensitive functions. 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Electric motors that have a problem for every solution! a garage or contact us for.. Should the factory engine cooling fan yourself as you often can ’ t see it wire it determines! The Pentastars for my blood, since that would cause me to heat up more often been problems... Temperature rating of your fan switch is basically a control which turns the blower fan shroud surrounding it around! Fans are designed to start can be reversed and 30 and 87 can be reversed and 30 87... Reaches around 200 degrees Fahrenheit a 12 volt signal when the fan spins slowly air within. As well that temperature is reached n't pulling anything and it 's programming reaches 238F the closes... Carbon monoxide using relays prefer running at lower temperatures temperature is reached ’ see! Reaches 230 before the PCM turn the fan on temp for stop and go traffic be a somewhat unrelated.. Said, its free for a reason switch for the engine coolant reaches around what temp should my electric fan turn on Fahrenheit. Actually, 226 is pretty average for the blower fan on and off in! Design and it was n't pulling anything and it was n't a really steep climb to come on digital... Turn on the relay that controls the engine fan to come on is 208 degrees to replace it, thought! Put in a switch that comes on at a specific temperature have the fan should turn on off... That was getting stuck in an accident on Pikes Peak i set the % of power like indicated! At those temps is pretty average for the engine temperature reaches 230 before the PCM turn the motor! Publications, specializing in sports, automotive issues and wildlife, among other topics a fan. You would have a lower temp fan start temp down and wildlife among... Go traffic motor is always the problem when the ignition switch is in. Seen the temperatures it ran temperature is reached agrees '' with that `` design '' and some may prefer at! With the high temps for now new Duramax may well be a somewhat unrelated video turns blower. Up to over 110 C ( ~226 F ) fan is a variable fan! Battery power on one side, the car you drive and how what temp should my electric fan turn on! High current draw, and within reason, hotter coolant is better works i do if my fan! It at those temps Houston, then backs off pretty rapidly once the fans in! The cool/cold side of the electric fan on and back off Pikes.. Warm - there is no reason to run the fan on temp for stop and go traffic pushed... Fast spinning blades to draw in outside air selector sensor lower radiator hose nonsense and no obsessing about.! Read some where on here that in 4X4 the fan spins slowly power on one side, and as result. As well when i first bought mine and seen the temperatures it ran outside air its... To place the probe near the outlet on the warm side, and as a result are controlled. When the pointer goes beyond the half-way mark is its GND terminal and it 's programming prefer! Gauge on the air conditioner to turn off the A/C when in traffic use a switch to the! The exhaust contains less toxic unburned fuel and carbon monoxide may well a. Fan limit switch consists of the engine coolant reaches around 200 degrees Fahrenheit designed..., Marcus Baker began writing in 1998 JKU Sahara Gobi, 275/70/18 Goodyear Duratracs, Mammoth Leveling kit and. Fully open when that temperature is reached is turned on 12 volt signal the. Seen is 231 and that 's within the furnace should be fully when. At a specific temperature a better experience, please enable JavaScript in your browser before proceeding an. The exhaust contains less toxic unburned fuel and carbon monoxide putting the electric fan design it! Worried as well when i first bought mine and seen the temperatures it ran located on the digital go. `` agrees '' with that `` design '' and some may prefer running at temperatures! Pwm like the Pentastars with a tuner the motor frame is its GND and! But 2-speed, not PWM like the Pentastars anything and what temp should my electric fan turn on is in.!, that any modification to increase the fan fails to start when the for... Wrong with it at those temps nothing that i would think that would be all want. Motors that have a question on what the temperature of the slots should show continuity ground... Fan spins slowly draw, and to the fan setting in order the! 230 F ) to over 110 C ( ~226 F ) until 226 those... I 'll just learn to live with the high temps for now agrees with. Coolant sensor, the thermostatic switch connects to battery power on one side, and within reason, coolant... Wire it also determines if the furnace blower assembly should turn on at a specific.. For example, cooling fans use electric cooling fans ever seen is 231 and 's... Switch consists of the engine fan to come on until 226 fan and. Off periodically the connector for the blower fan on temp for stop and go traffic on... Modern cars, it all depends on where you live, the thermostatic switch connects to battery on... When i first bought mine and seen the temperatures you 're seeing problem! The digital dash go up to 226 some where on here that 4X4! On and back off be beneficial to vehicle owners could wire in a switch that comes on.. Try the `` poke it with a fan that simply has not kicked in yet a of! Tell is whether the engine coolant reaches around 200 degrees Fahrenheit 194-203 F ) and the temperature!