If your BMW X3 low coolant light comes on, it’s normal to have to top off the tank once or twice a year. But if you top off your tank and the low coolant light comes on again within a few days or a week, then you probably have coolant leaking from the system somewhere. First, check the back of the oil fill cap and make sure you see only brown oil as expected. If it’s foamy or creamy texture, you might have a head gasket leak. Most likely you don’t have a head gasket leak and it’s a coolant hose or coolant expansion tank leak. In the video below I explain how to diagnose a BMW X3 coolant expansion tank leak and how to replace the tank.
As you can see in my video, I had a small leak that didn’t even puddle water in the garage, at first...
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I purchased on Amazon.com since there are close to a dozen plastic tabs you need to unsnap to access the tailgate lights. I purchased the tool, then opened the tailgate in my garage to a point that made it easy to access the gap between the outer tailgate and interior plastic cover.