what temp should my electric fan turn on

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

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