I have the same fault i ve repaced the oil cooler and its looking like its not cured it now it seems to over heat and the expansion tank does not pressurise and the water does not get hot in the header tanlk either
ricky
May 2009
Yes this is your oil cooler.
The Clown
April 2009
More likely to be the cylinder head gasket I'm afraid - especially if you have run out of coolant at sometime.