Is the Expansion tank leaking or something else?
Last week my 2007 X3s Low Coolant light came on when driving with the heat on. I looked under the hood and saw that the coolant was low. I added coolant and am noticing that it leaks as soon as I turn the car off after a drive. It does not leak if I leave the car on and also once it gets Low it does not leak. It only leaks when I fill it up and it seems it leaks everything I filled up but does not leak after a certain point. The low coolant sign has not come back on even with the Heat on. Also the car seems to shake just a little when waiting at a stop light.
Any suggestions on what it could be?
Any help is appreciated.