When i get around to putting up a pisture of my 300tdi Disco you will see how much crap i have in front of my radiator, lights and a high mount winch thingy, on what is the only landrover OEM winch nudge bar i've ever seen. I think the light actuall create a venturi effect and draw air i behind them like the negaive pressure behind a semi trailer for instance, i have not noticed any changes in running temps of my car since putting them on though. So it may be a coincidence that the viscous coupling has gone in your car now?!?
Cheers
Will

