Don't tell anyone but my 300tdi has no engine driven fan. I took it off and replaced it with an electric fan which I only switch on when my temperature gauge tells me I need to. I have NEVER needed to put it on in the UK. I only needed to switch it on twice in the southwest of France over a period of about 7 years. Makes you wonder why they ever bothered to fit them!Drove from south London to Tamworth in my old 300 with nothing at all for a fan belt. Found that the airflow thro the radiator was enough to spin the fan and keep it cool. Drove up the M1 on side lights as it was just getting dusk. Even started the next morning with no ill effects.