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

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