when i start my 97 range rover, i notice that after a few minutes, a open book looking icon followed by an exclamation appears in the panel that shows the temperature for the heat and a/c... what is this icon indicating,is the engine overheating, no engine light comes on, secondly, i don't know how to turn the heat, a/c on and off, where are the controls to turn it off, i'm familiar with the arrow buttons on both sides of the temp. panel, but how do you turn the heat on and off? Finally, my rover idles very high in park, but when it's put in gear it settles down and runs fine... what's causing this..... finally, on the speedometer it says maximum speed 30 mph, i am able to drive past 30 mph, but on a hill it sems to be limited to just 30 mphwhy is this and how can the above issues i mentioned be addressed? Thanks for your help in these matters!!!