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