. Anybody any knowledge on the wiring setup for the cooling fan on 2001 Golf TDI. The fan fails to come on sometimes and the engine is overheating. There's a switch on the rad, but it must switch a control unit or ECU. If I disconnect the rad switch the fan comes on after about a minute, so something is monitoring this circuit. However, It will sometimes switch off again and the engine will still overheat. Anyone any experience of this system.
John