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