2009 Dodge Ram 1500 Pickup Owner Manual - Page 230

228 UNDERSTANDING YOUR INSTRUMENT PANEL CAUTION! Driving with a hot engine cooling system could damage your vehicle. If temperature gauge reads "H" pull over and stop the vehicle. Idle the vehicle with the air conditioner turned off until the pointer drops back into the normal range. If the pointer remains on the "H" and you hear continuous chimes, turn the engine off immediately, and call an authorized dealership for service. 5. Speedometer The speedometer shows the vehicle speed in miles per hour and/or kilometers per hour (mph/km/h). 6. 4 LOW This light alerts the driver that the vehicle is in the four-wheel drive LOW mode. The front and rear driveshafts are mechanically locked together forcing the front and rear wheels to rotate at the same speed. Low range provides a greater gear reduction ratio to provide increased torque at the wheels. For more information on four-wheel drive operation and proper use, refer to "Four-Wheel Drive Operation - If Equipped" in section 5 of this manual. WARNING! A hot engine cooling system is dangerous. You or others could be badly burned by steam or boiling coolant. You may want to call an authorized dealership for service if your vehicle overheats. If you decide to look under the hood yourself, see Section 7 of this manual. Follow the warnings under the Cooling System Pressure Cap paragraph.