I own a 2001 Mercedes C. L. K. with climate control. I'm not sure if anyone has posted this yet but I thought is might be of interest to some people out their. If you hold down the restore button on the climate control for approximately five seconds a series of numbers will show up. The numbers on the left correspondence with different features of the car that are represented with the numbers on the right. The numbers on the left I believe are between 1 and approximately 43. I'm not sure what every number means but some of them are for RPM's #21, engine temp # 6, another is for battery voltage #24, for those of you who are into car audio, the higher the voltage the more you can get out of your stereo system, and actual ground speed, just in case your odometer is off. I noticed that mine was off slightly. I'm not sure which number it is but you can figure it out while your driving, maybe bring someone with you. All you need to do is push the auto button on the top or the bottom to scroll through the numbers. Try it out and you'll see what I'm saying I will post pixs.