BMW 5 Series E34 & 7 Series E32 Engine Fan Clutch Replacement
It's very easy to spot a bad fan coupling. The engine temperature will rise when standing in traffic. On my 735i it went to about the 3/4 mark. Apearantly the electrical fan on the aircon condenser will then be switched on though the temperature switch on the radiator.
End of the line!
BMW Engine Codes – Meanings and Location
BMW 5 Series E39 523i (12/1995 – 09/2000)
BMW 5 Series E39 530d (09/2000 – 07/2003)
BMW 5 Series E39 528i Automatic (12/1995 – 09/2000)