Light comes on more quickly when heater is on, but it will come on either way when at speed. My coolant light came on in my BMW X3. 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! SOURCE: I have 2007 BMW 335I that has been sitting in my garage for a month and started very little. The light is not constantly on yet. 2002 BMW 745Li. Click a link to learn more about each one. On the dash. thank you 04-24-2010, 12:25 PM #2. samadkins29. Nevertheless, the float stick was still floating and there was still some fluid left inside the reservoir. 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. It is a picture of the coolant container with low level water. the last time I started it the low coolant level light came on. Itis not leaking anywhere. the computer i have dont have coolant resat.. is any one know how to reset. Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? CHECK COOLANT LEVEL (2) Intermittent Cooling Warning Light. 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. Wondering if that will hurt the car. Need to put some more coolant in to get it to BMW. Goes off when i'm idle or going very slowly thru traffic etc. I did not know it had to be BMW coolant. The coolant level was low on a short trip. I checked the coolant reservoir and float stick was slightly below the "low line". I own a 2000 323I. 2011 523i … read more Will come back on when at speed. The coolant level sensor is located on the coolant expansion tank next to the radiator. Once you get your car to a mechanic, you may want to do a full system flush and install the correct BMW coolant. I topped off the coolant this morning when car was 100% cold, only added literally maybe 1/4 cup. 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. With that said, it is better to have some coolant than driving a BMW with no coolant at all. If BMW coolant too low warning light comes on and then turns off, the level may have dropped slightly. In the last few days the "low coolant" light has been intermittently turning on on my friend's BMW X3 (2007 ~70K miles). change new coolant but can't resat. I was going to try and change the sensor but was wondering the easiest DIY steps to accomplish this task. Hi all, Did some research and it seems that the coolant level sensor is a common problem to these cars. Coolant Level Sensor Description The coolant level sensor monitors the coolant level in the cooling system and indicates if the coolant is low. i have 02 745LI. What type of coo. Coolant lvl light will come on only when at speed. 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. 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. Apparently, it is low. This sensor is located at the base of the radiator surge tank and is not serviceable. There is no way to reset the light , you probably need a new coolant level sensor ! The following are warning lights and indicators found in vehicles built by BMW. Now it is low again. Hi Robert, No it is not normal for the coolant level to drop at any time. How to reset coolant light? 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