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