daraa Posted May 25, 2011 Report Share Posted May 25, 2011 my Z3 coolant is not leaking but overflowing what are the reasons for this to happen?? Link to comment Share on other sites More sharing options...
bimmerguydxb Posted May 25, 2011 Report Share Posted May 25, 2011 You must have over filled it when car was cool and at warmed up car coolant came out from overflow bottle. If not Then your car is overheating and water/coolant is boiling and spilling out of expansion bottle. Link to comment Share on other sites More sharing options...
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