Cooling Fan Resistors

[Gadget]

I have a 1.9tdi Ghia X 1999 (T reg) which the cooling fans (2 off) only run on high speed when called by the coolant temperature thermostat. The fans doe not operate when the air con is set to auto. Traced the problem to the two tapped resistors below the battery tray, both resistors and the tapping points are reading open circuit with my multimeter set to low ohms. Have not been able to source any direct replacements for these but am more than happy to make my own. However to do this I will need the resistance and wattage ratings for the total resistance and also the tapping point. I was wondering if some kind soul on here who owns a multimeter or has access to the specs for this could offer me some assistance with suitable values.