I forgot to add that a simple test you can perform yourself is to unplug the connector at the level switch and see if that clears your coolant low warning light. Apparently, it is low. Put regular coolant in. Click a link to learn more about each one. Intermittent Cooling Warning Light. They are roughly ordered by importance, which tends to be by color (red, amber, yellow, orange, green, blue, gray), but there are over 50 of them so be patient! i have 02 745LI. the computer i have dont have coolant resat.. is any one know how to reset. When the coolant level gets too low, the electrodes are exposed to air, the circuit is broken, and the low coolant level warning light on the dashboard is triggered. 2002 BMW 745Li. change new coolant but can't resat. Need to put some more coolant in to get it to BMW. The coolant level sensor is located on the coolant expansion tank next to the radiator. This sensor is located at the base of the radiator surge tank and is not serviceable. With that said, it is better to have some coolant than driving a BMW with no coolant at all. There is no way to reset the light , you probably need a new coolant level sensor ! Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? Will come back on when at speed. Light comes on more quickly when heater is on, but it will come on either way when at speed. 2011 523i … read more The light is not constantly on yet. My coolant light came on in my BMW X3. It is a picture of the coolant container with low level water. Hi Robert, No it is not normal for the coolant level to drop at any time. I own a 2000 323I. Goes off when i'm idle or going very slowly thru traffic etc. Once you get your car to a mechanic, you may want to do a full system flush and install the correct BMW coolant. About the Author Stephen has been an automotive enthusiast since childhood, owning some of his vehicles for as long as 40 years, and has raced open-wheel formula cars. thank you 04-24-2010, 12:25 PM #2. samadkins29. I checked the coolant reservoir and float stick was slightly below the "low line". Most of my experience with BMW is with older versions, but it is probably either low coolant, or coolant level sensor. Itis not leaking anywhere. Now it is low again. Someone might say the oil light has nothing to do with the low coolant light, but after the oil light was reset, the low coolant light was fixed too. The coolant level was low on a short trip. In the last few days the "low coolant" light has been intermittently turning on on my friend's BMW X3 (2007 ~70K miles). The following are warning lights and indicators found in vehicles built by BMW. How to reset coolant light? CHECK COOLANT LEVEL (2) Nevertheless, the float stick was still floating and there was still some fluid left inside the reservoir. Hi all, Did some research and it seems that the coolant level sensor is a common problem to these cars. I have been driving around with the coolant level light on and off for the last week with enough coolant in the tank and no leaks. I did not know it had to be BMW coolant. If BMW coolant too low warning light comes on and then turns off, the level may have dropped slightly. Coolant Level Sensor Description The coolant level sensor monitors the coolant level in the cooling system and indicates if the coolant is low. Coolant lvl light will come on only when at speed. On the dash. What type of coo. the last time I started it the low coolant level light came on. I topped off the coolant this morning when car was 100% cold, only added literally maybe 1/4 cup. SOURCE: I have 2007 BMW 335I that has been sitting in my garage for a month and started very little. 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