I have gained access to the cooling fan and its corresponding electrics today(nice day at last here in Stoke today) to investigate a fault code found whilst trying to find the cause of my limp mode. I managed to trace the circuit to establish which relay was which and checked all the connectors for signs of corrosion or distress. The main power circuit cables are fine as is the fan itself which ran powered off a 12volt battery feed. The connector for the five relay control wires (its a 6 pin connector ) had a little bit of white powder on the pins which cleaned up nice. The resistor looked brand new as did the connector block. Now this resistor assembly consists of a big coil to which it is attached to two of the three pins of the resistor block. Within this coil there is a small resistor that is across one end of the coil and the other pin. The female connector though has only got two receptacles with connections for the three male pins. Now when I have checked the resistance of the coil and the resistor no matter which pins I use the only reading I get is 1 ohm. So the two pins that connect to the plug give 1 ohm. The two pins that the resistor is across gives 1 ohm and the remaining 2 pins gives 1 ohm. Does that sound right and would that be enough to give the fan the low speed as opposed to the full speed when the resistor assembly is not in circuit. By the way the upper relay is the low speed control and the lower one is the full speed.