After replacing the cooling system components and several thorough bleeding sessions my low coolant light illuminates consistently after around 15 minutes of driving but then cycles off and on every few minutes. The only difference is that, prior to my cooling system overhaul, I had no leaks, lights or unusual cooling system behavior - my overhaul was purely for unknown history and preventative maintenance reasons. I have a similar situation to the OP here. Does anybody have any advice on what may be occurring ? I’m thinking an air bubble is being super shitty with me, but like I said I’ve bled the car multiple times. I’ve bled the car multiple times and I’ve checked the expansion tank multiple times and the levels have been correct. Still to this day, I have the coolant light coming on every single time I drive the car. I filled it up with a 50/50 mix of BMW blue coolant & distilled water, and bled the system multiple times until no air was coming out of the constant flow of coolant from the bleeder screw. I replaced everything in the cooling system including radiator, water pump, water pump pulley, thermostat, coolant hoses, expansion tank, and coolant level sensor. Some of the parts on the car were not from factory when I did the work, so I assume the previous owner did some cooling system maintenance work aswell. ![]() So I did a cooling system overhaul, at 170 000km. Last year, I was having some issues loosing coolant and my coolant light was coming on. ![]() I do all of my own maintenance on my 330ci. Alright, so let me start this off by saying I’m pretty mechanically inclined.
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