I'm having an issue with my 2004 R53 and need some thoughts on what it could be. The car is pushing coolant out of the expansion tank and of course causing it to spike in temps.


Car was purchased last year after the previous owner ran it hot. Put a new head on it along with gasket, etc. Car has been doing great for the past 6 months and 2000 + miles.


Car has 63K miles, has new radiator, electric water pump with new thermostat, new expansion tank with new cap, system has been properly bleed.


There is no oil issues (no coolant in oil), coolant is nice and clean as well, no smoke at start up or any other symptoms of head gasket failure. I have ran out of possible causes.


Any thoughts? Thanks

Bob