The cooling fan is controlled by the engine control module (ECM) via an output final stage. Electric cooling fan attached to rear of radiator. Belt driven coolant pump bolted to the front of the engine block. You can live out the rest of your days with a false low coolant error displayed and do nothing about it, but the leak can turn into a huge problem. BMW E46 cooling system components include: Radiator and coolant overflow tank. You need to find out what is leaking and cure it. Of the two problems you have, the false low coolant error is the least of them. The online seller sent me another new tank and the problem was solved. If the coolant light on your vehicles dashboard is illuminated, this is a certain sign your engine could be overheating and you should safely pull your vehicle. It will typically develop a hairline crack anywhere from 60-95k miles (give or take a few). i have replaced the radiator, upper hose, lower hose, expansion tank, auto gearbox thermostat, coolant level sensor, thermostat hose and have used the correct bmw coolant and refill procedure. The typical first failure of the E46 cooling system is the expansion tank. i have the dreaded coolant light coming on in my 2004 E46 318i n42 touring. With my diagnostics, I arrived at the conclusion that there was no other possibility than the tank was bad. i am hoping to pick your brains if I may. I put a "defective" sensor in my kid's car and it worked fine. I did not want to believe that the tank was the trouble, and I messed with it for several hours. Assuming I damaged the sensor, I replaced it. I once replaced an expansion tank and got the low coolant error immediately. The low coolant sensor is nothing more than a reed switch with a nearby magnet on a float, as the float lowers it actuates the switch to alert you that the coolant level has fallen. If the low coolant error persists after swapping sensors, the expansion tank itself is faulty. If the low coolant sensor is faulty, the new message will be that the washer fluid is low when it isn't. The coolant level check using the expansion tank float is INVALID unless the coolant is previous filled according to BMWs procedure. E46 Fanatics Forum is not in any way affiliated with Bayerische Motoren Werks AG VerticalScope Inc., 111 Peter Street, Suite 600. ![]() You can swap the washer reservior level sensor with the low coolant sensor, they are fully interchangable. Ive had a coolant light on for the past 2-3 years, replaced every single part of the coolant system (some parts more than once), and for the life of me couldnt tell you why I still have a coolant light on. It is not possible that an actual low coolant condition can exist and the expansion tank be full, therefore the low coolant error that you are having is false, which means either the sensor is bad or the tank is bad, or both. The seller reports that the battery, fuel pump, vacuum lines, water pump, thermostat. The Low Coolant message comes when the coolant (expansion tank) is all but empty. This E46 also comes with a clean, accident-free.
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