Hi , there have been a number of threads ref radiator fans not running , the problem i have with my 57 reg 2L TDI is that one of the radiator fan will run from cold as soon as the ignition is turned on (looking from front of car the right hand side fan) , does the Engine Temp Sensor fail in this way , i have not yet had a diagnosis carried out (still deciding which unit to buy) , any thoughts , many thanks Geoff .