For most types of driving, the pointer will hover about halfway. However, the engine will run satisfactorily when the pointer is at any position in the middle range. Continual stop-and-go driving or high-speed driving in warm weather, hill climbing, or towing another car may cause the gauge pointer to swing to the "H" side. If the pointer stays on the "H" side for more than two minutes, stop the vehicle and let the engine cool down, keeping it at 1,000 to 1,500 rpm.