Good news ....my viscous fan now works and u can hear it roar...drove for over a hour,up n down hills with great pleasure ...as engine was cooling lovely and as it should now....bad news...stopped for 5mins to do some shopping ...turned key drove 200m and temp went up to near red ,then come down again ....Had enough now of this problem ....thinking to myself now ...it's cracked head or head gasket....got proper ball ache and miseries....quoted 270 to do it ,if it's just head gaskets...cheap if it is ...and mechanical said add another 100 quid if it needs a skim ....anyone wanna buy a bmw 320d to fund my p38 resurrection