I plan to next week, in fact just finished reading through sgrice excellent DIY post on replacing the thermostat and am sure a new thermostat and water pump are in my X5's future. But that fact that I replace all the glow plugs and control module and had the same problems right away suggests another problem. Possibly, I have a problem with the wiring between the glow plugs and the control module. Have done a search and cannot find anyone else who has had the same issue...