2005 bmw 325ci coolant light
coolant light turns on when i use the heater in my car, and turns off when i turn
off the heater. The coolant levels arent low and there are no visible leaks. Ive
topped it off and the levels are good but the light still turns on.
You may have air in the system. Would try to purge air and see if that makes any difference and check fluid level again. Would also suggest a pressure test on the system. Good Luck!