This fan is electrically controlled and relies on the signal from the onboard computer. Posted by kevinowen7 on Aug 24, 2009. The ECM uses a remote power output. You must log in or register to reply here. Fuse box in the glove compartment BMW E46. That relay controls the fans for the engine. The easiest way is to use digital fan controllers. These cooling fans rely upon electric motor, and they typically have a moderate to high slow draw, which means that they are commonly controlled with a relay. The fan has a final stage resistor built in so it gets a pwm signal for activation and speed. Today we bought another electric fan. 3 May 2013 at 7:55 PM #2. No check engine lights present. i have just checked the big fuse in the glove box and it fine. GolfDuck Staff … You shouldnt be able to.-Extremely Slim possibility is the fan switch is dead. i unplugged the fan plug and started … You shouldnt be able to.-Extremely Slim possibility is the fan switch is dead. If you start noticing the heater fan speed varies regardless of the setting, the fan will not turn off when the car is switched off, or the fan will not switch on at all, these are all the symptoms of the Final Stage Resistor failure. :fencelook: Attached is a nice description of the M54 engine and ancillary systems. start the car and open the radiator filler cap there should be a small amount of water spraying into the expansion tank at a steady stream near the top (if this does not happen its your water pump). But when I put the heat on full blast I am getting cool to warn air blowing and the electric fan never kicks on. June 26, 2015 : Followup from the Pelican Staff: Is the fan coming on? Is radiator burning hot all the way across? 323i New member. theres three wires 1 is the plus 1 is minus and 1 is the thermostat find the plus and minus connect them up and it will be on all the time until you disconnect the wires. YES: Engine isnt hot enough or cooling system not bled all the way. Check the fuse first. Replaced the radiator along with the whole cooling system and its still getting hot, as the fan wasn't turning on. I would assume there is a sensor or wiring issue. Radiator fan not turning off. Save Share. I have a 323ci e46 1999 model, the other day my rad fan came on for no reason, the engine was stone cold, i removed the pos from the battery waited for about a min then replaced the pos connection problem solved, this was about a week ago. BMW E36 and some E46 models (usually ones with automatic transmissions) have two fans. When the temperature exceeds a specific value -- usually 215 degrees Fahrenheit -- the computer will turn the fan on. 2 days ago the rad fan came on again and the same trick would not work, so i have resorted to removing the fan fuse when ever … When the correct parameters are met, a temperature switch … We replaced his expansion tank last week. The issue affects 3 Series cars built between December 2004 and July 2011, meaning E46 (below) and E90 (top) models. Jan 19, 2010 #1 Hi guys, Tried looking on the internet and this seems to be a common problem but no real resolutions to be found. The electric fan should comes on while idling with the AC on. The condenser up front would be ineffective with a dead radiator fan and car not moving. If the fan is not working even when the car is overheating, there might be a wiring issue or a bad connection. The cooling fan relay is the relay that controls the engine’s cooling fans. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan … The cooling fan works with the a/c on. What turns the fan on: - Fan turns on when the A/C compressor turns on (engine cold) What doesn't turn on the fan: - On engine start or key on - Fan does not turn on - On engine stop after reaching operating temp - Fan does not turn on - … Check in the connector plugs for any signs of corrosion. I checked all the fuses, including the 50 Amp fuse behind the glove compartment, swapped the coolant temp sensor from another 323I to mine and the most imp part, I bought a new fan … Pulse duty factors less than 5 % and greater than 95 % do not trigger … Turn the AC on, if the electric fan does not come on. 3 Fanatics (E21 E30 E36 E46 E90 E91 E92 E93 F30) . June 26, 2015 : Followup from the Pelican Staff: Is the fan coming on? Comments: Any idea on how to re wire a relay to the electric fan on a e46? The problem is that the electric cooling fan is not coming on, this car has just one fan behind the radiator since its a manual. and when overheating I turn off the sensor on the hose and then the fan begins to full power to cool and then the temp is ok that the temperature sensor on the intake hose is not dealt with pre-grateful: April 30, 2019 : … E46 electric engine cooling fan not getting signal to come on when needed has new fan and power feed - Answered by a verified BMW Mechanic. The cooling fan that operates during non-AC operation (just a running engine) if electric, will be controlled by a thermal switch in the lower radiator tank and may not turn on at all unless the engine is warmed up. : E46 M3 . JavaScript is disabled. is there a way of testing it? Verified voltage coming out of harness, about 12V. also think ive a faulty stat ive not changed yet could there be a link? I've seen this before... A. AcidBurn New member. Using a BMW scan tool, command the cooling fan on. I have a 99 323I Manual 5 speed. Is radiator burning hot all the way across? Discussion in 'E46 M3 (2001-2006)' started by tonybolony, Sep 13, 2019. Excellent replacement for the mechanical clutch and auxiliary electric fan on e46 automatic 3 Series. Use the oem electric fan from the manual transmission cars. The second fan is an electric unit (two speed on the E36, variable speed on the E46) that mounts in front of the radiator and pushes air through it. Open the glove compartment and turn the two white quick-release fasteners outward. Some vehicles have a separate coolant temperature sensor for the fan… 3 Fanatics (E21 E30 E36 E46 E90 E91 E92 E93 F30). The only other place where the engine heat can be taken out is through the heater core radiator. Verified voltage coming out of harness, about 12V. Put it in the car and stopped working again. it doesnt come on when AC is activated, the 50 amp fuse is … We took our vehicle to the dealer (in buena park,CA) and was told that we had to pay for repairs because we waited to long to bring the vehicle in! I was not until we talked with a another person who also experienced the same problem, that we found it there was a recall by BMW. Check the fuse first. This happened several times. After the engine is switched off, the fan may continue to operate at varying speeds (based on the ECM calculated catalyst temperature). Does the fan turn on? It is especially noticeable on higher mileage cars, or vehicles that have sustained a front end impact somewhere along their lifespan. ... those fans have been known to literally blow apart when they have all their blades,and turn a minor part issue into a massive $1,500+expense (if you do the work yourself). Answer: It is possible to do this. The problem is that the electric cooling fan is not coming on, this car has just one fan behind the radiator since its a manual. 2003 325i e46 BWM here. While the car is moving at modest speed and there is enough air flow through the radiator, the fan needn't be on. If the fan receives a false signal, the fan might not turn on, causing the engine to overheat. You can try to start the fan with some real computer diagnostic (INPA or better, but I don't mean better in user friendliness...). Fuse box diagram (location and assignment of electrical fuses and relays) for BMW 3-Series E46 (316i, 318i, 318d, 320i, 320d, 323i, 325i, 328i, 330i, 330d). My 323i with manual transmission overheated last week, radiator seemed to be leaking. Opened the hood and was pretty sure it was the belt or a pulley. E46 Electric fan doesn't work. I shut off the engine to cool it down. This article concerns itself with the latter fan, which is otherwise known as the "auxiliary fan", or "aux fan" for short. i plugged the car again to the computer, tried to activate the fan using the software, didnt work... went to the parts store, got another fan under warranty, it worked for a … For a better experience, please enable JavaScript in your browser before proceeding. When I run the engine idle 15 minutes later temperature goes up to 240 degrees, the high fan kicks on and does not bring the temperature down. No fan is needed for speeds over 30MPH. I have a manual e46 the aux fan and radiator fan are not on my car though. Mar 30, 2015 #4 Hey moranor, thanx for taking the time out to respond. The cooling fan relay is the relay that controls the engine’s cooling fans. I checked all the fuses, including the 50 Amp fuse behind the glove compartment, swapped the coolant temp sensor from another 323I to … The electric fan should run. May 14, 2019 | In DIY Install Guides | By Andrew. Vehicles with M62TU, S62 and M73 engines feature a viscous fan as well as an electric fan. Replaced the radiator along with the whole cooling system and its still getting hot, as the fan wasn't turning on. The fan will usually store a fault in the dme for activation or ihka system faulted for excess pressure (because fan is not coming on). We use cookies to give you the best possible experience on our website. The condenser (heat exchanger) for the A/C is in front of the radiator, not in the cabin. In the wintertime, you would not have to use it at all. About Radiator Fans A radiator fan is a significant part of the automotive cooling system (assuming the vehicle has a water cooled … Clicking this will make more experts see the question and we will remind you when it gets answered. Fuse box diagram. If he wants to overheat the engine, he should definitely use the AC when idling. OP if most of your travels are on the Highway and with speeds over 30MPH, you should be good. These cooling fans rely upon electric motor, and they typically have a moderate to high slow draw, which means that they are commonly controlled with a relay.That relay controls the fans for the engine. It could be due to any number of factors - the E46 cooling fan itself, or a switch or electric relay that has failed. Blower Motor Final Stage Fan Resistor Failure. The electric fan is activated by means of a power output stage directly on the fan motor. No, if he doesn't want to over heat the engine, he should have AC on at full blow and open the windows. Joined: May 5, 2019 Messages: 25 Likes Received: 5 Trophy Points: 3 What're you driving? You could do some tests to troubleshoot the cause yourself, like hooking up a volt-meter to the fan-connectors. If the fan receives a false signal, the fan might not turn on, causing the engine to overheat. 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